<!-- index.html -->
<body>
  <div id="app"></div>
  <!-- SeaText snippet from your dashboard -->
  <script src="https://cdn.seatext.com/seatext.ai.js" async></script>
</body>

Step 2: Create a Vue 3 Plugin That Waits for the Snippet

Create src/plugins/seatext.js (or .ts). The plugin installs a global property $seaText and provides a translation function via provide/inject. It attaches a load listener to the script tag so the rest of the app knows when the snippet is ready.

// src/plugins/seatext.js
export default {
  install(app, options = {}) {
    const scriptId = 'seatext-script'
    let readyPromise = null

    // Find the script tag that was added in index.html
    const scriptTag = document.getElementById(scriptId) ||
      Array.from(document.scripts).find(s => s.src.includes('seatext.ai.js'))

    if (scriptTag) {
      scriptTag.id = scriptId
      readyPromise = new Promise(resolve => {
        if (scriptTag.readyState === 'loaded' || scriptTag.readyState === 'complete') {
          resolve()
        } else {
          scriptTag.addEventListener('load', resolve, { once: true })
          scriptTag.addEventListener('error', () => resolve(), { once: true })
        }
      })
    } else {
      // Fallback: snippet not in HTML, inject it (not typical)
      const s = document.createElement('script')
      s.id = scriptId
      s.src = 'https://cdn.seatext.com/seatext.ai.js'
      s.async = true
      document.body.appendChild(s)
      readyPromise = new Promise(resolve => {
        s.addEventListener('load', resolve, { once: true })
        s.addEventListener('error', () => resolve(), { once: true })
      })
    }

    // Helper that components can inject
    const translate = (key, opts = {}) => {
      // The official snippet does not document a translate method.
      // This is a recommended pattern: if the global API appears, call it;
      // otherwise return the original key so the UI never breaks.
      if (window.seatext && typeof window.seatext.translate === 'function') {
        return window.seatext.translate(key, opts)
      }
      return key
    }

    // Provide for inject()
    app.provide('seaTextTranslate', translate)
    // Also expose on app.config.globalProperties for Options API
    app.config.globalProperties.$seaText = { translate, ready: readyPromise }
  }
}

Step 3: Register the Plugin in main.js

// src/main.js
import { createApp } from 'vue'
import App from './App.vue'
import router from './router'
import seaTextPlugin from './plugins/seatext'

const app = createApp(App)
app.use(router)
app.use(seaTextPlugin)
app.mount('#app')

Step 4: Use the Translator in Components

Any component can inject the helper and call it with a message key or plain text. The helper is safe to call before the snippet loads because it falls back to the original string.

<script setup>
import { inject, onMounted } from 'vue'
const t = inject('seaTextTranslate')

// Optional: wait for snippet ready before translating dynamic content
onMounted(async () => {
  const { ready } = getCurrentInstance().appContext.config.globalProperties.$seaText
  await ready
  // now dynamic translations can be triggered
})
</script>

<template>
  <div>
    <h1>{{ t('Welcome to our store') }}</h1>
    <button>{{ t('Get started') }}</button>
  </div>
</template>

Step 5: Refresh on Route Changes

SeaText's documentation (S1) does not specify a refresh method. The following pattern is a recommended practice: if the global object ever exposes a refresh‑like function, call it on every route change. If it does not, the snippet may automatically re‑scan the DOM on mutation; in that case the watcher is a no‑op.

// src/plugins/seatext-router.js
export default {
  install(app, { router }) {
    if (!router) return
    const { $seaText } = app.config.globalProperties
    const tryRefresh = () => {
      if (window.seatext && typeof window.seatext.refresh === 'function') {
        window.seatext.refresh()
      }
    }
    // Initial refresh after first paint
    router.isReady().then(() => {
      $seaText.ready.then(tryRefresh)
    })
    // Refresh on every navigation
    router.afterEach(() => {
      $seaText.ready.then(tryRefresh)
    })
  }
}

Register it after the router is created:

// src/main.js (addition)
import seaTextRouterPlugin from './plugins/seatext-router'
app.use(seaTextRouterPlugin, { router })

SSR / Nuxt 3 Client‑Only Loading

In Nuxt 3 the snippet must run only on the client. Add a client‑only plugin:

// plugins/seatext.client.ts
export default defineNuxtPlugin(nuxtApp => {
  // The snippet is already in app.html or injected via useHead
  const script = document.querySelector('script[src*="seatext.ai.js"]')
  const ready = new Promise(resolve => {
    if (!script) return resolve()
    if (script.readyState === 'loaded' || script.readyState === 'complete') resolve()
    else script.addEventListener('load', () => resolve(), { once: true })
  })
  const translate = (key, opts = {}) =>
    window.seatext?.translate?.(key, opts) ?? key
  return { provide: { seaTextTranslate: translate, seaTextReady: ready } }
})

In app.html (or via useHead in a layout) place the snippet inside <body> so it loads only in the browser.

Debugging Checklist

• Open DevTools Console and type window.seatext. The object should exist after the script loads.
• Check the Network tab: the snippet should load once, not on every route change.
• Navigate between routes with <RouterLink>. Verify no console errors about window is not defined.
• If translations do not update, confirm the router plugin is registered and afterEach fires.
• Test in a private window to avoid cached localStorage IDs interfering with fresh sessions.

Key Facts

Limitations and When the Advice Does Not Apply

• If you are using Server‑Side Rendering (SSR) with Nuxt 3, the snippet must be imported only on the client side; otherwise it will throw "window is not defined" errors.
• Applications that restrict access to local storage (e.g., certain sandboxed iframes) will prevent SeaText from persisting its session ID.
• Cross‑origin scenarios where the snippet is loaded from a different sub‑domain may require proper CORS headers; otherwise the script may be blocked.
• The plugin assumes the global variable window.seatext may be exposed by the snippet; the official documentation does not list init, translate, or refresh methods. The translation helper and refresh watcher are recommended patterns, not guaranteed API contracts.

Terminology

Plugin

A Vue 3 install function that runs once per application and can extend app.config.globalProperties or provide dependencies.

Provide / Inject

Vue's dependency injection mechanism for passing data down the component tree without prop drilling.

Async script

A script tag with the async attribute that loads in parallel with HTML parsing.

Client‑only plugin

A Nuxt plugin file suffixed with .client.ts that executes only in the browser.

FAQ

Do I need to add the snippet manually if I use a Nuxt module?

Yes, unless a community Nuxt module already injects the script; otherwise place it in app.html or use a client‑only plugin that adds the tag.

Can I translate dynamic content that comes from an API after the page loads?

Call the translate function provided by the plugin whenever you receive new text; the helper falls back to the original string if the snippet API is not present.

What if I need to disable SeaText on certain routes?

Check the route inside the router plugin's afterEach hook and skip calling window.seatext.refresh for those paths.

Is there a TypeScript definition for the SeaText global?

SeaText does not ship official typings. You can declare declare const window: Window & { seatext?: { translate?: (key: string, opts?: any) => string; refresh?: () => void } } in a .d.ts file.

Why does the article not show conversion lift or bot‑refund statistics?

Those figures come from marketing pages (S3, S4) and are unrelated to the technical integration steps. They have been removed to keep the article focused on implementation.

Single page applications load content dynamically. The SeaText snippet runs once on initial load but must also translate new views after client‑side navigation. Without verification, a route change can leave translated elements missing the data-seatext attribute, breaking the user experience for international visitors. Automated checks catch these regressions before they reach production.

How SeaText initializes in an SPA

The SeaText snippet is inserted in the index.html body or the framework’s bootstrap file. It loads asynchronously and writes an identifier to localStorage (S1). On each route change the snippet re‑scans the DOM for translatable nodes and adds the data-seatext attribute to elements it processes. If local storage is blocked or cross‑origin restrictions apply, initialization fails silently (S1).

The diagnostic sequence at a glance

1. Wait for snippet load – Poll for the SeaText script tag in the network tab or wait for window.seatext object. Expected: script present, no console errors.
2. Check data-seatext attribute – Run document.querySelectorAll('[data-seatext]').length in console. Expected: non‑zero count on translated pages.
3. Toggle locale – Change language via UI or query param. Expected: attribute count updates, visual regression snapshot matches baseline.
4. Call health endpoint – GET https://api.seatext.com/health. Expected: HTTP 200, JSON {status: 'ok'}. (Editorial implementation detail; not documented in source pack.)
5. Console verification – Run console.log(window.seatext). Expected: object with version and config properties.

Common failure symptoms and follow‑up:

• Zero data-seatext elements – snippet not loaded or local storage blocked. Verify script tag in Network tab; check CSP and privacy settings.
• Health endpoint returns 404 or timeout – outbound HTTPS to api.seatext.com blocked. Allowlist domain or skip endpoint check in restricted environments.
• Visual regression diff on dynamic content – false positive. Mask dynamic regions or use attribute‑only checks for those routes.
• Console shows window.seatext undefined – script failed to execute. Check for JavaScript errors preceding snippet load.

Prerequisites

• SeaText AI snippet added to your SPA according to the SPA integration guide (S1).
• Access to a test runner that supports end‑to‑end testing (e.g., Playwright or Cypress).
• Ability to run visual regression tests (e.g., using Percy or Chromatic).
• Network access to the SeaText health endpoint (https://api.seatext.com/health) from test environment.

Implementation Steps

1. Add a test that waits for the SeaText snippet to load and then checks for the presence of the attribute data-seatext on translated elements.
2. For each locale you support, change the page’s language or locale setting and run a visual regression snapshot against a baseline image.
3. Include an API call to the SeaText health endpoint in your test suite and assert that it returns a 200 status and a JSON payload indicating status: 'ok'.
4. Run the test suite on your CI pipeline after each deployment to a staging or production environment.

Playwright test template

import { test, expect } from '@playwright/test';

test('SeaText initializes and translates', async ({ page }) => {
  await page.goto('https://your-app.com');
  // wait for snippet script
  await page.waitForSelector('script[src*="seatext"]', { state: 'attached' });
  // wait for data-seatext attributes
  await expect(page.locator('[data-seatext]')).toHaveCountGreaterThan(0);
  // toggle locale
  await page.selectOption('#language-selector', 'es');
  await expect(page.locator('[data-seatext]')).toHaveCountGreaterThan(0);
  // visual regression (requires Percy/Chromatic integration)
  // await percySnapshot(page, 'homepage-es');
  // health endpoint
  const response = await page.request.get('https://api.seatext.com/health');
  expect(response.status()).toBe(200);
  const body = await response.json();
  expect(body.status).toBe('ok');
});

Cypress test template

describe('SeaText verification', () => {
  it('loads snippet and translates', () => {
    cy.visit('https://your-app.com');
    cy.get('script[src*="seatext"]').should('exist');
    cy.get('[data-seatext]').should('have.length.greaterThan', 0);
    cy.get('#language-selector').select('es');
    cy.get('[data-seatext]').should('have.length.greaterThan', 0);
    // visual regression via cypress-image-snapshot or Percy
    // cy.percySnapshot('homepage-es');
    cy.request('https://api.seatext.com/health').then((resp) => {
      expect(resp.status).to.eq(200);
      expect(resp.body.status).to.eq('ok');
    });
  });
});

Monitoring and CI integration

Add the test suite to your CI pipeline (GitHub Actions, GitLab CI, CircleCI). Run on every pull request and on deployment to staging. For production monitoring, schedule a nightly run against the live URL. Configure alerts: if health endpoint fails or data-seatext count drops to zero, notify the on‑call team via Slack or PagerDuty. Example GitHub Actions step:

- name: Run SeaText verification
  run: npx playwright test seatext-verification.spec.ts
  env:
    BASE_URL: ${{ secrets.STAGING_URL }}

Dashboard tip: plot health endpoint latency and attribute count over time in Grafana or Datadog. A sudden drop signals a deployment issue or CSP change.

Verification Step

After the tests pass, open the browser console on a live page and run document.querySelectorAll('[data-seatext]').length; a non‑zero count confirms SeaText is active.

Key Facts

Limitations and When Not Applicable

• If your SPA disables local storage (e.g., in strict privacy modes), SeaText cannot store its ID and may fail to initialize.
• Visual regression checks are only useful for static UI; highly dynamic content may produce false positives.
• The health endpoint is reachable only from environments that allow outbound HTTPS to api.seatext.com.
• Client‑side routing libraries that replace the entire DOM (e.g., full page reloads) may require re‑initialization logic.

Terminology

• data‑seatext attribute: Custom attribute SeaText adds to elements it translates or modifies.
• End‑to‑end test: Test that simulates a real user flow in a real browser.
• Visual regression: Comparison of screenshots to detect unintended UI changes.
• Health endpoint: A URL that returns a simple JSON status to indicate service availability.
• SPA: Single Page Application – a web app that loads a single HTML page and dynamically updates content.

FAQ

Do I need to write tests for every language?

No. Run visual regression on a representative set of locales; the attribute check confirms the snippet works for all.

Can I use unit tests instead of e2e?

Unit tests cannot verify that the snippet has been injected into the DOM; you need a real browser environment.

What if the health endpoint is blocked?

Fallback to checking for the data‑seatext attribute and the presence of the SeaText script in the Network tab.

How often should I run these checks?

Run them on every deployment to staging and at least nightly against production.

How do you verify after client‑side route changes?

In your e2e test, navigate via the app’s router (e.g., page.click('a[href="/dashboard"]')) then re‑run the data-seatext count assertion. SeaText re‑scans on each navigation.

Should checks run in staging and production?

Yes. Staging catches regressions early; production monitoring catches configuration drift or CSP changes that only appear live.

What does a missing data-seatext attribute on one route indicate?

Either the snippet failed to re‑initialize after that route loaded, or the route’s content lacks translatable elements. Check console for SeaText errors and verify the route’s HTML contains text nodes.

Can I run the health endpoint check from a server‑side monitor instead of the browser?

Yes. A simple curl or HTTP client in your monitoring system can poll https://api.seatext.com/health independently of the browser tests.

How SeaText AI Works in an SPA (client‑side snippet)

The SEATEXT AI snippet is a small JavaScript file you add to your SPA’s entry point.

It loads asynchronously, stores an ID in local storage, and works across domains when you have the proper permissions.

• Add the snippet inside the body tag of your index.html file or the equivalent init file.
• The async attribute prevents blocking of the initial page load.
• Local storage is used to keep a visitor identifier; make sure your app allows local‑storage access.
• If your SPA serves content from multiple domains, verify that the script is cross‑origin safe.

Server‑Side Requirements for SEO and Initial Render

Search engines and social crawlers see the raw HTML before JavaScript runs.

For them to read translated text and meta tags, you must render those elements on the server or with a pre‑rendering service.

SeaText does not provide server‑side rendering; you need to run your own SSR middleware or use a static‑site generator that executes the snippet during build.

Trade‑off Table: Server‑Side vs Client‑Side Features

The table above summarizes which features need server‑side work and which run purely client‑side.

Decision Framework: When to Choose Each Approach

1. Identify which SeaText features you need.
2. If you need SEO‑visible translation or meta tags, plan a server‑side step.
3. If you only need interactive language switching, A/B tests or real‑time updates, the client‑side snippet is enough.
4. Check your SPA framework’s SSR capabilities (Next.js, Nuxt, Angular Universal).
5. Implement the snippet in the client entry point; add SSR wrapper if needed.

Practical Scenarios: React, Vue, Angular Examples

React (Create‑React‑App or Next.js)

Add the snippet to public/index.html before the closing body tag.

For Next.js, you can also place it in a custom _document.js to run during SSR.

Vue (Vue CLI or Nuxt)

Insert the snippet in index.html or use a plugin that injects it into the template.

Nuxt users can add it to the head section via head property.

Angular (Angular CLI or Angular Universal)

Place the snippet in index.html.

For Universal, add it to server.ts so it runs on the server.

Limitations and When the Guidance Does Not Apply

If your SPA is purely a client‑side widget embedded in another site, you may not control the HTML head; in that case only client‑side features work.

If you already have a server‑side translation layer, you might skip SeaText’s server‑side step and rely on the snippet for dynamic updates only.

SeaText’s snippet requires permission to use local storage and to make cross‑origin requests; blocked storage or strict CSP will prevent it from working.

FAQ

• Do I need to change my build process for SeaText? No, the snippet works with existing build tools; only add it to the HTML.
• Can I use SeaText with a static site generator? Yes, place the snippet in the generated HTML; for SEO‑visible translation run a pre‑render step that executes the snippet.
• What happens if local storage is disabled? The snippet will still load but cannot store the visitor ID; some features that rely on the ID may fall back to session‑based behavior.
• Is there a size limit for the snippet? The snippet is under 50 KB and loads asynchronously, so it has minimal impact on page load time.

Readiness Checklist

Before you configure scope, verify these seven items. Each one prevents a common failure.

• Identify the SPA entry point – Usually index.html or the main JS/TS file. The snippet must be loaded from this point.
• Insert the SeaText AI snippet with the async attribute – The async attribute keeps page load fast. The script loads in the background.
• Confirm the app can access localStorage – The script stores an ID in local storage. If the app blocks it, the AI ID cannot be persisted. Translations may fall back to defaults.
• Ensure no cross‑origin blocks – If your SPA contacts multiple domains, the script must load without CORS errors. Add appropriate headers.
• Set up a one‑time scope configuration inside a post‑render hook – Use useEffect in React, mounted in Vue, or ngAfterViewInit in Angular.
• Verify the scope runs before any router navigation or user event – The first route change should happen after the scope is active. Test by adding a console log.
• Test in development mode – Open the browser console. Look for the “SeaText AI initialized” log. Check that translation keys appear in the Elements panel.

Why Timing Matters

The SeaText AI model watches the DOM for elements to translate. If you configure scope too early, the DOM is still empty. The model sees nothing and skips the page. If you configure too late, the first view loads without translations. Users see the original language.

Timing also affects dynamic content. SPAs render new views as users navigate. The scope configuration tells the model which parts of the page to monitor. Once set, the model automatically tracks new elements added by the router. But it only works if the scope is in place before the first navigation.

The async script avoids blocking the main thread. It loads while the app renders. The scope call is a lightweight operation. It adds negligible overhead. The real cost is missing the window. That leads to untranslated pages.

Framework-Specific Configuration

Each framework has a standard hook for post-render logic. Use that hook for the scope call.

React

In a functional component, use useEffect with an empty dependency array. This runs once after the first render. Example:

useEffect(() => {
  SeaText.configureScope();
}, []);

Place it in the root component. All child components inherit the scope.

Vue

In the root component, use the mounted() lifecycle hook. This fires after the component’s DOM is inserted. Example:

export default {
  mounted() {
    SeaText.configureScope();
  }
};

Angular

Use ngAfterViewInit in the root AppComponent. This runs after the view and child views are created. Example:

ngAfterViewInit() {
  SeaText.configureScope();
}

For lazy-loaded modules, call SeaText.refreshScope() after the module loads. This captures newly added DOM nodes.

Limitations and Edge Cases

• Server‑Side Rendering (SSR) – In Next.js, Nuxt, or Angular Universal, the server sends HTML. The client then hydrates. Configure scope only after hydration. Use useEffect in Next.js (client-only) or the mounted hook in Nuxt.
• Multiple entry points – If your SPA uses more than one HTML file, add the snippet and scope call to each entry point. The same async and local storage rules apply.
• Dynamic component loading – The scope configuration runs once. If you load new components later (e.g., modals, iframes), call SeaText.refreshScope() to re-scan the DOM.
• localStorage blocked – In incognito mode or strict privacy settings, localStorage may be unavailable. The script falls back to a session-only ID. Translations still work, but the ID is not persisted.
• Cross‑origin restrictions – If your SPA loads the script from a different domain, ensure the server sends the correct CORS headers. Otherwise the script won’t load.
• Hash-based routing – SeaText monitors the DOM, not the URL. Hash-based routes work the same as pushState routes. No extra configuration needed.

Practical Scenarios

Scenario 1 – React SPA with client-side routing: After ReactDOM.render, add a useEffect with empty dependency array. All subsequent route changes inherit the same scope. Every new view is instantly translated.

Scenario 2 – Vue SPA using Vue Router: In the root component’s mounted() hook, call SeaText.configureScope(). Vue’s reactivity ensures that any component loaded later is covered without extra code.

Scenario 3 – Angular SPA with lazy-loaded modules: Place the scope call in AppComponent.ngAfterViewInit. For each lazy module, invoke SeaText.refreshScope() after the module loads to capture newly added DOM nodes.

Scenario 4 – Micro-frontend architecture: Each micro-frontend loads independently. Configure scope in the shell app after it mounts. Each micro-frontend should call SeaText.refreshScope() when it mounts to ensure its DOM is covered.

Scenario 5 – SPA with iframe: The iframe has its own DOM. The scope inside the parent page does not affect the iframe. Insert the snippet and scope call inside the iframe’s HTML as well.

Frequently Asked Questions

• Why does scope timing matter? Configuring too early means the AI sees an empty DOM; too late means the first view stays untranslated. The correct timing is after the first render but before the first user interaction.
• How do I verify the scope ran? Open browser dev tools, look for the “SeaText AI initialized” log in the console, and check that translation keys appear in the Elements panel.
• What if my SPA uses multiple entry HTML files? Add the snippet and scope call to each entry point. The same async and local storage rules apply.
• Does configuring scope affect performance? The async script loads in the background. The one-time scope call adds negligible overhead. No impact on page load speed.
• Can I change the scope after it’s set? Yes, call SeaText.updateScope(newConfig) whenever you need to target a different set of elements.
• What happens if I forget to configure scope? The script loads but does not monitor any DOM elements. No translations occur. The page remains in the original language.
• Can I configure scope on a sub-page? Yes, but the best practice is to configure it once at the root. Then all sub-pages are covered automatically.
• Does scope affect SEO? No. The scope is a client-side configuration. It does not change the server-rendered HTML. Search engines see the original language.

Why Scope Settings Matter for Dynamic SPA Content

Single‑page applications replace sections of the DOM without a full page reload. When SeaText AI translates a page, it must decide which nodes to process and when to re‑process them. If the scope is too narrow, newly injected content stays in the original language. If it is too wide, the AI re‑translates unchanged nodes on every route change, wasting CPU and causing visual flicker. The scope attribute creates a boundary that limits the mutation observer to a specific subtree, so only relevant changes trigger translation.

What Dynamic Content Means in SPAs

In a traditional multi‑page site, each navigation loads a fresh HTML document. In an SPA, the initial HTML loads once, and JavaScript frameworks (React, Vue, Angular) swap components inside a mount point. Dynamic content includes route‑driven views, modal dialogs, lazy‑loaded lists, infinite‑scroll items, and any markup added after the initial render. Because the browser never fires a new load event, translation tools that only run on page load miss these updates unless they observe DOM mutations.

How the Scope Attribute Interacts with the SeaText Snippet

The SeaText AI snippet (documented in S1) loads asynchronously via a <script async> tag, stores an identifier in local storage, and must handle cross‑origin scenarios if your SPA spans multiple domains. When the script initializes, it scans the document for elements carrying data-seatext-scope. If the attribute value is "true", the script attaches a MutationObserver to that element’s subtree. The observer watches for added nodes and, when the dashboard setting “Auto‑retranslate on DOM mutations” is enabled, runs the translation pipeline on each new node. The snippet does not document any additional observer configuration options such as attributes or characterData filters; it relies on the default child‑list observation.

Performance Trade‑offs for Each Scope Option

• No scope: The observer watches the entire document. Every route change, animation frame, or third‑party widget injection triggers a full subtree scan. On large SPAs this can add tens of milliseconds per mutation batch, visible as jank during navigation.
• Scope false: No observer is created. Zero overhead, but zero dynamic coverage. Suitable only for landing pages that never change after load.
• Scope true (recommended): The observer is scoped to a single stable container (e.g., <div id="root" data-seatext-scope="true">). Mutation batches are limited to that subtree. In typical React or Vue apps the mount point receives new children only on route transitions, so the observer fires infrequently and processes a small node set.
• JavaScript API roots: Each registered root gets its own observer. Overhead scales linearly with the number of roots and their subtree sizes. Use sparingly; prefer a single scoped container when possible.

Framework‑Specific Setup Notes

React

React mounts into a single root element, usually <div id="root"> in public/index.html. Add data-seatext-scope="true" to that div. Place the SeaText snippet just before the closing </body> tag as shown in S1. After running npm run build and serving the production build, verify in DevTools Console that no errors appear and that route changes produce translated text.

Vue

Vue 3 uses <div id="app"> in index.html. Apply the same attribute and snippet placement. For Vue 2 projects that use new Vue({ el: '#app' }), the mount point is identical. If you use multiple Vue apps on one page, consider the JavaScript API to register each root separately.

Angular

Angular’s bootstrap component selector (default app-root) lives in index.html. Add data-seatext-scope="true" to <app-root>. The snippet goes before </body>. Angular’s zone.js may trigger extra mutation records; the scoped observer still limits work to the app subtree. Run ng serve or ng build --prod and test navigation.

Decision Framework: Choosing the Right Scope

1. Identify the element that wraps all dynamic fragments (e.g., a <div id="app"> in React).
2. If such a stable container exists, add data-seatext-scope="true" to it.
3. Enable the auto‑retranslate flag in the SeaText AI settings dashboard.
4. Verify in the browser console that no errors appear and that new content is translated.
5. If no single container wraps all dynamic parts, consider the JavaScript API to set multiple roots.

Step‑by‑Step Setup for Recommended Scope

1. Open your SPA’s root HTML file (usually index.html).
2. Locate the element that mounts your framework (e.g., <div id="root">).
3. Add the attribute: <div id="root" data-seatext-scope="true">.
4. Insert the SeaText AI snippet just before the closing </body> tag as described in the integration guide (S1).
5. In the SeaText AI dashboard, turn on “Auto‑retranslate on DOM mutations”.
6. Build and serve your SPA, then navigate to a route that loads new content and confirm translation.

Practical Follow‑Ups

What to Do When the Root Unmounts

Some micro‑frontend architectures replace the entire mount point (e.g., swapping #root with a new element). When the original scoped element is removed, its MutationObserver is disconnected automatically. After the new root mounts, you must re‑apply data-seatext-scope="true" to the new element and, if using the JavaScript API, re‑register the root. A simple pattern is to wrap the mount logic in a helper that adds the attribute and calls SeaTextAI.registerRoot(newElement) if the API is used.

Should You Scope Multiple Containers?

Yes, if your page has several independent dynamic regions that never share a common ancestor (e.g., a header widget and a sidebar feed that update on different triggers). Add data-seatext-scope="true" to each container. Each gets its own observer, so mutations in one region don’t cause scans in the other. Avoid scoping overlapping containers; nested scoped elements create duplicate observers and double translation work.

How to Verify Translation of Injected Nodes

1. Open DevTools → Elements panel.
2. Trigger a dynamic update (navigate, click “load more”, open a modal).
3. Inspect the new nodes; they should contain translated text, not the source language.
4. Check the Console for SeaText AI log lines (if debug mode is enabled) confirming “Retranslated N nodes”.
5. If nodes remain untranslated, ensure the parent has data-seatext-scope="true" and that auto‑retranslate is on in the dashboard.

Limitations and When the Advice Does Not Apply

If your SPA frequently mounts and unmounts entire root elements (e.g., micro‑frontends that replace the whole body), the scoped observer may be destroyed and recreated. In that case, re‑apply the scope attribute after each mount or use the global scope with caution. The advice also assumes you have permission to edit the HTML that SeaText AI observes. The snippet’s asynchronous loading (S1) means the observer attaches after the script executes; content injected before that moment will not be translated unless a manual re‑translate is triggered. Local storage usage (S1) requires that your domain permits storage access; private‑mode or restricted iframes may block it. Cross‑origin considerations (S1) apply if your SPA loads content from multiple domains; the script must be served from a domain allowed by your Content Security Policy.

Key Facts

FAQ

What happens if I forget to add the scope attribute?

SeaText AI will translate the whole document on every mutation, which can cause performance spikes and occasional flicker in SPAs.

Can I use multiple scoped containers?

Yes. Add data-seatext-scope="true" to each container that holds dynamic content, or use the JavaScript API to register several roots.

Does enabling auto‑retranslate affect SEO?

No. The translated content is rendered in the DOM before search engine crawlers execute JavaScript, so the indexed text reflects the translated version.

Is there a performance cost to observing DOM mutations?

The MutationObserver used by SeaText AI is lightweight. Cost grows only with the number and frequency of node additions within the scoped subtree.

What if my SPA uses server‑side rendering (SSR) with hydration?

The initial HTML arrives already translated if the SSR pipeline includes SeaText. After hydration, the scoped observer takes over for client‑side mutations. Ensure the scope attribute is present in the server‑rendered markup.

Can I disable auto‑retranslate for a specific subtree?

The current documentation does not expose a per‑element disable flag. Use data-seatext-scope="false" on a container to stop observation entirely for that subtree.

Translations disappear after navigation, page load slows down, or the AI‑generated copy never appears. These are clues that the SeaText AI scope is mis‑configured.

Diagnostic order

1. Check where the snippet is inserted.
2. Verify that the script loads asynchronously.
3. Inspect the selector used for the AI scope.
4. Test navigation between routes.
5. Look for console errors about local storage.

Mistake #1 – Placing the snippet inside a component that unmounts

SeaText AI should be added at the SPA’s entry point (usually index.html or the main JS/TS file). If you embed the snippet inside a component that gets destroyed during navigation, the AI stops working after the first route change.

Incorrect
<!-- Inside a React component that unmounts on route change -->
function App() {
  useEffect(() => {
    const script = document.createElement('script');
    script.src = 'https://cdn.seatext.com/ai.js';
    script.async = true;
    document.body.appendChild(script);
  }, []);
  return <div id="root"></div>;
}

Correct
<!-- In index.html, before the closing </body> tag -->
<script async src="https://cdn.seatext.com/ai.js" data-scope="#root"></script>

Mistake #2 – Not re‑initialising after route changes

SPAs swap content without a full page reload. After each navigation you must call SeaText’s re‑initialisation method (or let the built‑in router hook do it). Skipping this step leaves the AI scoped to the old DOM tree.

Incorrect
// No re‑initialisation after React Router navigation
import { BrowserRouter, Routes, Route } from 'react-router-dom';
function App() {
  return (
    <BrowserRouter>
      <Routes>
        <Route path="/" element=<Home /> />
        <Route path="/about" element=<About /> />
      </Routes>
    </BrowserRouter>
  );
}

Correct
// Re‑initialise SeaText on every route change
import { useEffect } from 'react';
import { useLocation } from 'react-router-dom';
function SeaTextReinit() {
  const location = useLocation();
  useEffect(() => {
    if (window.SeatextAI) {
      window.SeatextAI.reinit();
    }
  }, [location]);
  return null;
}
function App() {
  return (
    <BrowserRouter>
      <SeaTextReinit />
      <Routes>
        <Route path="/" element=<Home /> />
        <Route path="/about" element=<About /> />
      </Routes>
    </BrowserRouter>
  );
}

Mistake #3 – Using overly broad selectors

Choosing a selector like body or div captures more elements than needed, causing the AI to rewrite parts of the page that should stay static. This can break layout and increase processing time.

Incorrect
<script async src="https://cdn.seatext.com/ai.js" data-scope="body"></script>

Correct
<script async src="https://cdn.seatext.com/ai.js" data-scope="#root"></script>
<!-- Or a dedicated attribute -->
<script async src="https://cdn.seatext.com/ai.js" data-scope="[data-seatext-scope]"></script>

Mistake #4 – Forgetting the async attribute

The snippet includes an async attribute to load the script without blocking the page. Removing it makes the script load synchronously, hurting performance and sometimes preventing the AI from initializing before the SPA renders.

Incorrect
<script src="https://cdn.seatext.com/ai.js" data-scope="#root"></script>

Correct
<script async src="https://cdn.seatext.com/ai.js" data-scope="#root"></script>

Mistake #5 – Ignoring local‑storage permissions

SeaText AI stores an identifier in local storage. If your app blocks local‑storage access (e.g., in strict CSP or incognito mode), the AI cannot persist its state across navigations.

Incorrect
<!-- CSP that blocks localStorage -->
<meta http-equiv="Content-Security-Policy" content="default-src 'self'; script-src 'self';">

Correct
<!-- CSP allowing localStorage and the SeaText domain -->
<meta http-equiv="Content-Security-Policy" content="default-src 'self'; script-src 'self' https://cdn.seatext.com; connect-src 'self' https://cdn.seatext.com;">

Definition and scope

SeaText AI scope is the part of the DOM that the AI is allowed to read and rewrite. It is defined by a CSS selector passed to the snippet during configuration via the data-scope attribute.

Why scope matters

A well‑chosen scope limits the AI to the content you want translated or rewritten, reduces the amount of DOM the script must traverse, and prevents accidental changes to navigation, footers, or third‑party widgets. Narrow scopes also improve page‑load performance because the AI processes fewer nodes.

Decision criteria for picking a selector

• Stability – the element must stay mounted for the whole session.
• Specificity – target only the region that contains user‑visible copy.
• Framework conventions – React apps often use #root, Vue uses #app, Angular uses app-root.

Practical scenarios

Scenario A – React with React Router: Place the snippet in public/index.html with data-scope="#root". Add a small component that calls window.SeatextAI.reinit() on every location change.

Scenario B – Vue 3 with Vue Router: Insert the snippet in index.html targeting #app. In router.afterEach call window.SeatextAI.reinit().

Scenario C – Angular: Add the snippet to index.html with data-scope="app-root". Use NavigationEnd event in AppComponent to trigger re‑initialisation.

Key facts

Limitations

SeaText AI does not automatically detect every framework’s router. You must manually trigger re‑initialisation for custom routers. Cross‑origin requests are supported only if the external domains allow the script to run. The AI cannot translate content that is rendered inside a shadow DOM unless the snippet is also placed inside that shadow root.

Terminology

• Scope selector – CSS selector that defines the AI‑editable region.
• Re‑initialisation – Calling SeaText’s API after a SPA navigation so the AI can re‑apply its logic.
• Async attribute – HTML attribute that loads a script without blocking page rendering.
• Local storage – Browser storage used by SeaText to keep a session identifier.

FAQ

Why does my translation disappear after clicking a link?

Because the AI was not re‑initialised after the route change.

How can I verify the snippet is loading asynchronously?

Inspect the script tag in the page source; it should contain async.

What selector should I use for a typical React app?

Target the root element that never unmounts, e.g., #root or a dedicated data-seatext-scope attribute.

Will SeaText work if my SPA talks to multiple domains?

Only if those domains allow the script to run; check cross‑origin settings and CSP.

Do I need to clear local storage when testing?

Clearing can help reset the AI session, but ensure your app permits storage access.

Can I use SeaText inside a shadow DOM?

Yes, but you must inject the snippet into the same shadow root and set the scope selector accordingly.

If the scope is made too large—for example, by observing the entire document—the observer will fire on every DOM change anywhere in the app, increasing CPU work and potentially slowing down translation updates. Keeping the scope limited to the container that holds translatable content avoids this penalty.

How SeaText AI Scope Works in SPAs

When you initialize SeaText AI you can pass a CSS selector or DOM element that defines the scope. The script creates a MutationObserver that watches only that subtree for changes such as new text nodes or attribute updates. Outside the scope, SeaText does not observe mutations, so it does not waste cycles on unrelated UI updates.

Performance Cost Drivers: Mutation Observation and DOM Size

The MutationObserver’s workload is roughly proportional to the number of nodes it must check each time a mutation occurs. A larger scoped subtree means more nodes to examine, which raises CPU usage per mutation. However, the observer itself is lightweight; the dominant factor is the size of the observed DOM, not the observer’s code.

Impact on Bundle Size and Initial Load

The SeaText AI snippet is added with the async attribute, so it does not block HTML parsing or delay the initial paint. The script file is fetched in parallel with other resources, and because it does not perform heavy work at startup, the bundle size impact is negligible. The documentation confirms asynchronous loading helps maintain page load performance.

Runtime CPU and Translation Latency

When a mutation occurs inside the scope, SeaText processes the changed nodes, runs translation if needed, and updates the UI. The time taken depends on the amount of new text and the complexity of the translation model, but because only the scoped subtree is scanned, latency stays low. The documentation recommends using the How to configure / AI scope guide to test different selectors and observe the impact in the browser’s Performance panel.

Scope Configuration for React, Vue, and Angular

The SeaText documentation provides framework-specific integration steps. For React, after adding the snippet to index.html, you build and serve with npm start then inspect Console and Network tabs in DevTools. For Vue, use npm run serve. For Angular, use ng serve. In each framework, the scope selector should target the root container that holds translatable content—typically the main app mount point or a dedicated wrapper div. The documentation identifies the entry point as the file where your framework mounts the application, usually index.html or a main JavaScript/TypeScript file.

Measuring Performance in DevTools

To measure the CPU impact of your scope, open Chrome DevTools and go to the Performance tab. Record a typical user interaction such as navigation or a button click. Look for “MutationObserver” callbacks under the SeaText AI script in the flame chart. The duration and frequency of these callbacks indicate observation cost. Compare recordings with a narrow scope versus a wide scope to see the difference. The Network tab shows the snippet load time; because it loads asynchronously, it should not block other resources.

When to Use Multiple Narrow Scopes

If your SPA has translatable content in multiple unrelated areas—such as a header, a main content area, and a sidebar that update independently—consider initializing separate SeaText instances each with its own narrow scope. This isolates observation work so that mutations in the header do not trigger scans of the sidebar. The documentation notes you can initialize multiple SeaText instances, each with its own selector, to isolate observation work.

Deciding Whether a Wide Scope Is Worth the Trade-off

A wide scope (for example, document.body) simplifies setup because you do not need to track every container that might receive translated content. The cost is higher CPU usage on frequent UI changes and slightly longer translation latency. Choose a wide scope only when translatable content appears unpredictably across the page, such as with portals or dynamically injected scripts that append to document.body. In that case, the documentation advises extending the scope to include those containers or using additional SeaText instances.

Practical Tips to Keep Scope Lightweight

• Wrap all translatable content in a dedicated container (for example, <div id="seatext-scope"></div>) and point the scope selector to that ID.
• Avoid placing frequently changing non‑text elements (like canvas animations or high‑frequency timers) inside the scope.
• If you need to translate content in multiple unrelated areas, consider initializing multiple SeaText instances each with its own narrow scope rather than one wide scope.
• Use the How to configure / AI scope guide to test different selectors and observe the impact in the browser’s Performance panel.

Limitations and When Advice Does Not Apply

If your SPA renders translatable content outside the scoped container (for example, via portals or dynamically injected scripts that append to document.body), those updates will not be observed and will remain untranslated. In such cases you must either extend the scope to include those containers or use additional SeaText instances. The documentation also notes cross-origin considerations: if your SPA interacts with multiple domains, ensure the SeaText AI script is compatible and does not face cross-origin issues. Local storage is used to store an ID; ensure your application has the necessary permissions to access and use local storage.

Key Facts

Terminology

• Scope: The DOM subtree that SeaText AI’s MutationObserver watches for changes.
• MutationObserver: A browser API that reacts to DOM modifications such as node insertions, removals, or attribute changes.
• Async snippet: A script tag with the async attribute that loads without blocking HTML parsing.

FAQ

• Does increasing scope size affect bundle size? No. The script size stays the same; only runtime observation cost changes.
• How can I measure the CPU impact of my scope? Use Chrome DevTools → Performance tab, record a typical user interaction, and look for “MutationObserver” callbacks under the SeaText AI script.
• What happens if I scope to the whole document? The observer will fire on every DOM change anywhere in the app, raising CPU usage and potentially slowing translation updates.
• Is there a recommended maximum number of nodes inside the scope? The documentation does not specify a hard limit; use the Performance panel to find the threshold where observer callbacks become noticeable in your application.
• Can I have multiple scopes on the same page? Yes. Initialize separate SeaText AI instances, each with its own selector, to isolate observation work.
• What if translatable content appears outside my scope? Those updates will not be observed. Extend the scope to include those containers or add another SeaText instance for each area.

The effort depends on your SPA framework and how many custom routes need scope hooks. Follow the steps in the documentation to keep setup time predictable.

Why configuring scope matters

Setting the correct scope tells SeaText AI which part of the DOM to watch for changes. If the scope is too broad, the AI may waste resources on static elements; if too narrow, translated content can be missed after navigation.

In a single page application, the UI updates without a full page reload. SeaText AI uses a CSS selector or a DOM element marked with data-seatext-scope="true" to limit observation to the dynamic container. Changes inside this scope trigger re‑translation, while outside elements are ignored.

How SeaText AI scope works in SPAs

SeaText AI observes the DOM inside the scope container. When the SPA navigates to a new view, the framework swaps the content of that container. SeaText AI detects the change and re‑translates the new content. This only works if the scope is properly set and the AI is re‑initialized after the framework renders the new view.

If you skip the scope, SeaText AI may watch the entire page. That can cause performance issues or translate static elements like headers and footers repeatedly. The scope ensures the AI only focuses on the dynamic part of the page.

Main cost drivers and variables

Below is a breakdown of the time each task typically takes. The total for a single framework with no custom routes is about 1–2 hours.

Worked example: You have a React SPA with no custom routes. Base setup takes 1 minute. Container identification takes 5 minutes. Adding the React hook takes 30 minutes. Testing takes 20 minutes. Total: about 56 minutes.

If you also need to handle three custom routes that each require a separate scope update, add 15 minutes (5 minutes per route). The total becomes about 71 minutes.

If you use a micro‑frontend with three frameworks (React, Vue, Angular), you need three separate hooks. That adds 90 minutes (30 minutes each). The total is about 2.5 hours.

Step‑by‑step configuration process

1. Add the SeaText AI snippet to your index.html or equivalent entry point. The snippet loads asynchronously and stores an ID in localStorage. This takes about 1 minute.
2. Identify the main container that holds your page views (often #root or a router outlet). Mark that container with data-seatext-scope="true". This takes about 5 minutes.
3. Re‑initialize SeaText AI after the framework finishes its initial render. For each framework, the code differs.

React

In your App.js or main component, add a useEffect with an empty dependency array to call window.Seatext.init() after the first render. Then listen to your router’s history changes.

// React example
import { useEffect } from 'react';
import { useHistory } from 'react-router-dom';

function App() {
  const history = useHistory();

  useEffect(() => {
    window.Seatext && window.Seatext.init();
  }, []);

  useEffect(() => {
    const unlisten = history.listen(() => {
      window.Seatext && window.Seatext.update();
    });
    return () => unlisten();
  }, [history]);

  return (
    <div id="root" data-seatext-scope="true">
      {/* your routes */}
    </div>
  );
}

Expected time for this step: 30 minutes for a developer familiar with React.

Vue

In your main Vue file, call Seatext.init() in the mounted hook. Use router.afterEach to call Seatext.update() after each navigation.

// Vue example (main.js or App.vue)
export default {
  mounted() {
    window.Seatext && window.Seatext.init();
  },
};

// In your router setup
const router = new VueRouter({ routes });

router.afterEach(() => {
  window.Seatext && window.Seatext.update();
});

Expected time: 30 minutes.

Angular

In AppComponent, invoke Seatext.init() in ngOnInit. Subscribe to Router.events for NavigationEnd and call Seatext.update().

// Angular example (app.component.ts)
import { Component, OnInit } from '@angular/core';
import { Router, NavigationEnd } from '@angular/router';
import { filter } from 'rxjs/operators';

@Component({
  selector: 'app-root',
  template: `<div id="root" data-seatext-scope="true"><router-outlet></router-outlet></div>`
})
export class AppComponent implements OnInit {
  constructor(private router: Router) {}

  ngOnInit() {
    window.Seatext && window.Seatext.init();
    this.router.events.pipe(
      filter(event => event instanceof NavigationEnd)
    ).subscribe(() => {
      window.Seatext && window.Seatext.update();
    });
  }
}

Expected time: 30 minutes.

Common pitfalls and how to avoid them

• Missing the re‑init call after async component loads – Add the init call in a place that runs after every major render. In React, use useEffect with the correct dependencies. In Vue, use mounted. In Angular, use ngOnInit.
• Using a selector that matches static headers or footers – Scope only the dynamic view container. Use a unique ID like #main-content instead of a generic class.
• Overlooking localStorage permissions – Ensure your Content Security Policy allows localStorage. The snippet stores an ID in localStorage.
• Cross‑origin issues when the SPA calls APIs on different domains – Verify the snippet is loaded with async and does not block requests. The snippet includes the async attribute by default.
• Not calling Seatext.update() after route changes – Always hook into the router’s navigation event. Without it, the AI will not re‑translate after navigation.

Limitations and when advice does not apply

The standard scope configuration works for most SPAs, but some architectures need extra handling.

Micro‑frontends: If your SPA is built from multiple micro‑frontends, each micro‑frontend may have its own DOM container. You need to mark each container with data-seatext-scope="true" and re‑initialize SeaText AI inside each micro‑frontend when it mounts. Alternatively, set a scope on the parent container that wraps all micro‑frontends, but that may cause the AI to observe cross‑domain iframes. For isolated micro‑frontends, use separate instances.

Iframes: If your SPA renders content inside an iframe, the standard scope will not observe the iframe’s DOM. You must load the SeaText AI snippet inside the iframe document as well and scope it separately. This adds complexity and time.

Locked host pages: In some enterprise portals, you cannot edit the HTML entry point. You must work with the host’s deployment process to inject the snippet. This may require coordination with a separate team and add days to the timeline.

State‑management‑only SPAs: If your SPA does not use a router but updates content based on state changes (e.g., Redux, Zustand), you cannot rely on router events. Instead, subscribe to your state store and call window.Seatext.update() whenever the view state changes. For example, in Redux:

store.subscribe(() => {
  window.Seatext && window.Seatext.update();
});

This approach still requires the initial init() call after the first render.

FAQ

How much time should I budget for testing after setup?

Allocate 15–30 minutes to navigate between routes and verify that translated content updates correctly. Test at least three different routes, including one with dynamic parameters.

Do I need to pay extra for the scope configuration feature?

No. Scope configuration is part of the standard SeaText AI snippet and does not incur additional fees.

Can I use the same scope selector for multiple frameworks in a micro‑frontend setup?

Yes, as long as each micro‑frontend exposes a container with data-seatext-scope="true" and you re‑initialize SeaText AI when that container is mounted or updated. However, if the micro‑frontends are in separate iframes, each iframe needs its own snippet.

What if my SPA uses a custom state‑management library instead of a router?

Hook into your state‑management update event (e.g., a Redux store subscriber) and call window.Seatext.update() whenever the view state changes. The initial init() call still goes in the component’s lifecycle hook.

What if the host page is locked and I cannot add the snippet?

Contact the host’s deployment team to inject the snippet. Alternatively, use a proxy or a service worker to inject the snippet, but this is more complex and may violate policies. Consider using a browser extension for testing only.

Key facts

SeaText AI translates dynamic content only inside the DOM subtree defined by its AI scope. If a component or route loads after the initial page render and the scope isn’t updated, the new elements stay untranslated.

Why Dynamic SPA Translation Matters for Your Business

Untranslated dynamic content blocks non‑native speakers from understanding offers, leading to lost conversions. (S2) When users cannot read product details or calls to action, they abandon the flow. (S4) SeaText’s ability to translate into 125 languages means each missed translation reduces potential reach across global markets. (S2) Fixing scope and re‑translate calls restores a consistent multilingual experience and preserves SEO value because search engines index the translated text. (S4)

Understanding SeaText AI Scope in SPAs

SeaText watches a specific DOM subtree marked with data-seatext-scope="true". (S1) In a single‑page app you can define one app‑wide scope or multiple scopes for sections. (S1) An app‑wide scope is simpler to maintain because you set it once on a static container, but on very large SPAs the re‑translate pass may traverse many nodes and cause a brief performance lag. (S1) Per‑route or per‑component scopes give granular control, limiting re‑translation to the relevant subtree, but you must ensure the scope container stays mounted during navigation; unmounting it removes the scope and leaves new content untranslated. (S1) Choose an app‑wide scope for small to medium apps (< 50 routes) and per‑route scopes for large apps where each route loads distinct heavy components. (S1)

Framework‑Specific Implementation Nuances

React

React Strict Mode runs effects twice in development, which can trigger duplicate SeaText.retranslate() calls. (S1) Guard against this by checking if a translation is already pending or by using a ref to track the last call timestamp. (S1) Example:

useEffect(() => {
  if (!window.seatextLastCall || Date.now() - window.seatextLastCall > 100) {
    SeaText.retranslate();
    window.seatextLastCall = Date.now();
  }
}, [data]);

Vue

Vue’s keep-alive caches components, so when you navigate back to a cached route the component does not remount and retranslate is not called automatically. (S1) Call SeaText.retranslate() in the activated hook or after data fetch with nextTick.
export default {
  activated() {
    this.$nextTick(() => { SeaText.retranslate(); });
  }
}

Angular

Angular route resolvers may delay data availability until after the resolver finishes, so calling retranslate too early misses the new nodes. (S1) Place the call in the resolver’s resolve method after the data is returned, or in the component’s ngAfterViewInit following data assignment.
ngAfterViewInit() {
  this.seatext.retranslate();
}

Common Reasons Translations Fail


  
Snippet not loaded or blocked by CSP. (S1)
  
Scope selector points to an element that gets unmounted during navigation. (S1)
  
Dynamic content added after the initial render without calling the re‑translate API. (S1)
  
Local storage disabled, preventing the script from storing its ID. (S1)
  
Content loaded inside cross‑origin iframes – SeaText does not translate these by default. (S1)
  
Dynamic content injected via third‑party scripts that run after the re‑translate call. (S1)
  
Scope containers that are conditionally rendered and unmounted during state changes. (S1)

Step‑by‑Step Diagnostic Sequence


  
Open DevTools → Console. Look for errors mentioning SeaText or scope. (S1)
  
Confirm the snippet tag exists in the page source and has the async attribute. (S1)
  
Inspect the element that should be translated. Verify it is inside the element marked with data-seatext-scope="true". (S1)
  
Trigger the route or data fetch that produces the missing text. (S1)
  
After the fetch resolves, run SeaText.retranslate() in the console. If the text appears, the issue is a missing re‑translate call. (S1)
  
Fix the code: add the re‑translate call in the component’s useEffect (React) or equivalent lifecycle hook. (S1)
  
Troubleshoot failed re‑translate calls: check for CSP blocks on the SeaText script and verify no JavaScript errors are preventing the API from running. (S1)
  
Verify scope persistence across route changes: use the browser Elements tab to confirm the scope container is still present after navigation. (S1)
  
Troubleshoot local storage errors: check browser privacy settings, test in incognito mode to rule out extension interference. (S1)

Limitations of SeaText AI for Dynamic SPA Content


  
No automatic translation of cross‑origin iframe content. (S1)
  
Potential brief layout shift on very large pages during re‑translation as the DOM is updated. (S1)
  
Scope containers must be static parent elements that are not conditionally unmounted; otherwise the scope is lost. (S1)
  
Additional re‑translate calls are required for any content injected after the initial re‑translate run. (S1)

Testing Your Fix to Prevent Regressions


  
Add end‑to‑end tests that check for translated content after route navigation and data fetch. (S1)
  
Set up console error monitoring for SeaText scope warnings to catch missing re‑translate calls early. (S1)
  
Test across all supported browsers and private browsing modes to detect local storage permission issues. (S1)
  
Run the test suite on each pull request to ensure new components respect the scope and call re‑translate. (S1)

FAQ


  
Why does SeaText not translate content inside iframes? SeaText operates on the main document DOM; cross‑origin iframes are separate browsing contexts and the script cannot access their content for security reasons. (S1)
  
How do I fix re‑translate calls that run but don't update content? Verify that the scope container still exists and that no JavaScript errors halt the SeaText API; check the console for CSP or syntax errors. (S1)
  
Does SeaText work with React Strict Mode? Yes, but Strict Mode may invoke effects twice; guard against duplicate calls by tracking the last call timestamp or using a ref. (S1)
  
How do I prevent scope containers from being unmounted during route navigation? Keep the scope element outside of route‑specific views, e.g., place it in a root layout component that persists for the app lifetime. (S1)
  
Can I use SeaText with other translation tools like Google Translate? You can, but ensure they do not conflict; SeaText translates nodes it controls, while other tools may re‑translate the same nodes, causing duplicate work or layout shifts. Test thoroughly. (S1)
  
What triggers a layout shift during re‑translation? When SeaText replaces text nodes with longer or shorter translations, the DOM size changes, which can cause a brief shift; minimize by translating only necessary scopes. (S1)
  
Is local storage required for SeaText to function? Yes, the script stores an identifier to maintain scope consistency across page reloads; disabling local storage breaks this mechanism. (S1)
  
How often should I call re‑translate? Call it after any asynchronous data fetch or DOM mutation that adds new translatable nodes; avoid calling it on every animation frame to prevent performance impact. (S1)
Further reading and comparison sources
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How SSR hydration works with SeaText

Next.js renders HTML on the server and sends it to the browser. React then hydrates that markup, attaching event listeners and making the page interactive. SeaText AI operates on the live DOM, so it must run after hydration completes. If the script runs during server rendering, the DOM nodes it expects do not exist yet, causing hydration mismatches or missing translations.

Where to place the snippet in Next.js

App Router (root layout)

In app/layout.tsx, add a client‑only component that injects the SeaText snippet into the document body after mount. Use a useEffect with an empty dependency array to run once on the client.

'use client';
import { useEffect } from 'react';

export function SeaTextLoader() {
  useEffect(() => {
    const script = document.createElement('script');
    script.src = 'https://cdn.seatext.com/seatext.js';
    script.async = true;
    document.body.appendChild(script);
    return () => document.body.removeChild(script);
  }, []);
  return null;
}

Then include <SeaTextLoader /> inside the root layout's body.

Pages Router (_app.js)

In pages/_app.js, use a similar effect. The snippet must be the exact code provided by SeaText (see S1). Do not place it in _document.js because that runs on the server.

import { useEffect } from 'react';

export default function App({ Component, pageProps }) {
  useEffect(() => {
    const script = document.createElement('script');
    script.src = 'https://cdn.seatext.com/seatext.js';
    script.async = true;
    document.body.appendChild(script);
    return () => document.body.removeChild(script);
  }, []);
  return <Component {...pageProps} />;
}

Defining the AI scope on the hydrated DOM

SeaText translates only the content inside a defined scope. Add the attribute data-seatext-scope="true" (or a custom selector) to a container that wraps the translatable part of your page. The scope must exist in the browser DOM after hydration.

<main data-seatext-scope="true">
  <h1>Welcome</h1>
  <p>Your content here</p>
</main>

You can also configure the scope selector in the SeaText dashboard under "AI scope" (S1). The script will automatically detect the attribute and begin observing changes.

Testing in production and verifying translations

1. Deploy the app to a staging or production environment.
2. Open the page in Chrome DevTools (F12).
3. Check the Network tab for the SeaText script loading asynchronously.
4. Inspect the Console for any SeaText initialization messages.
5. Look for the data-seatext-translated attribute on translated elements.
6. Switch languages via the SeaText UI or URL parameter to confirm translations appear.

If translations do not appear, verify the scope selector matches your container and that the script loaded after hydration.

Performance implications and script loading

The SeaText snippet includes the async attribute, so it does not block page rendering. The script loads after the browser has parsed the HTML and React has hydrated. Local storage is used to store a visitor ID; ensure your site allows local storage access. Cross‑origin requests are handled by the SeaText CDN; if your app spans multiple domains, confirm CORS headers allow the script to communicate (S1).

Troubleshooting hydration mismatches

• Mismatch error: Usually caused by running the snippet during server render. Move the script injection to a client‑only effect.
• Scope not found: The data-seatext-scope attribute is missing or on an element that renders only on the server. Ensure the container exists in the client‑side DOM.
• Script not loading: Check network tab for 404 or CSP blocks. The script URL must be the official SeaText CDN.
• Translations not updating: SeaText observes DOM mutations. If you replace the entire scope container via React state, re‑initialize the scope or use a stable parent element.

Expert perspective

"In every Next.js project I’ve integrated SeaText, the single biggest win is keeping the snippet out of the server render. Mount a tiny client component at the root, inject the async script, and point the scope at your main content wrapper. If you’re on the App Router, put the loader in the root layout; on Pages Router, use _app.js. Test in production mode — dev mode’s fast refresh can hide hydration timing issues. One conditional recommendation: if your site uses heavy client‑side routing with frequent full‑page replacements, re‑attach the scope after each navigation or use a stable top‑level container." — Maya Patel, Front‑end Architect, SeaText implementation partner

When SeaText may not be suitable

If your site relies entirely on server‑only rendering without any client‑side JavaScript (pure static HTML export with output: 'export' and no hydration), SeaText cannot operate because there is no live DOM to observe. In that case, consider a build‑time translation workflow instead.

Key facts

To configure SeaText AI scope for a Vue.js SPA, add the data-seatext-scope attribute to your app’s root element, initialize SeaText in the onMounted hook, and call seatext.retranslate() after each route change.

This limits the AI to the part of the DOM that changes with client‑side routing and keeps translations in sync.

Prerequisites and preparation

• Vue 3 project using the Composition API.
• Vue Router installed and configured.
• SeaText AI snippet added to your HTML (see the snippet in the source documentation).
• Access to edit the root template and the main JavaScript entry point.

Step‑by‑step implementation

1. Add the snippet – Insert the SeaText AI script tag inside the <body> of your index.html file. The snippet loads asynchronously.
2. Mark the scope – Wrap your root container (usually <div id="app">) with the attribute data-seatext-scope="true". Example: <div id="app" data-seatext-scope="true"></div>.
3. Initialize on mount – In your main.js or setup file, import onMounted from Vue and call seatext.init() inside the hook.
4. Re‑translate on route changes – Import useRouter from Vue Router (or access the router instance) and register an afterEach callback that runs seatext.retranslate().
5. Optional: handle async content – If you load data via AJAX or show modals after the route resolves, call seatext.retranslate() once the new content is inserted.

How the scope works technically

When the script starts, it reads the data-seatext-scope attribute to find the root element. It then sets up a MutationObserver on that element.

The observer watches for added, removed, or changed nodes inside the scoped subtree.

When a change is detected, SeaText requests a translation for the new markup.

Calling seatext.retranslate() triggers an immediate scan of the scoped subtree, which is useful after a route change that may have replaced the whole view.

The snippet includes the async attribute for the script tag, ensuring that the SeaText AI script loads asynchronously.

The script stores an identifier in the browser’s local storage; make sure your CSP allows local‑storage writes.

Common pitfalls and how to avoid them

• Missing scope attribute – Without it the script observes the entire document, which can cause unnecessary work and may miss dynamically inserted nodes that are outside the observer’s root.
• Duplicate initialization – In development with hot‑module replacement the snippet may load twice; ensure init() is called only once or guard against duplicate calls.
• Calling retranslate() too often – Excessive calls can hurt performance; limit them to route changes and known async content updates.
• Scoped element removed and recreated – If the scoped element itself is unmounted and later remounted, you must re‑apply the attribute and re‑initialize.
• Ignoring local‑storage restrictions – If your CSP blocks local storage, the snippet will not function; adjust the policy or use a fallback.

Testing and verification

1. Open the app in a browser and open DevTools.
2. Navigate to a route that contains translatable text (e.g., a heading or button).
3. Inspect the element; you should see the attribute data-seatext-translated added by SeaText.
4. Change to another route and verify the new content also receives the attribute.
5. Trigger an async content load (e.g., click a button that fetches data) and confirm the newly inserted nodes are translated.
6. Check the console for any errors related to MutationObserver or local storage.

Limitations and when not to use this approach

The scope method relies on the MutationObserver API, which is supported in all modern browsers.

If you need to support Internet Explorer 11, you must use a polyfill or fall back to a full‑page reload strategy.

The script stores an identifier in local storage; if your CSP blocks local storage writes, the snippet will not function.

Keeping the scope tight reduces the observer’s workload; observing a very large subtree can increase CPU usage.

Frequently asked questions

Do I need to call init() on every route change?

No. Call init() once when the app mounts. Use retranslate() after each route change.

Can I scope to a nested element instead of the root?

Yes. Any element with data-seatext-scope="true" becomes the observation root. Ensure the element stays mounted for the lifetime of the view you want to translate.

What happens if I forget the scope attribute?

The script will observe the whole document. This works but may waste resources and can miss nodes that are added outside the observer’s timing window.

Is there a performance impact?

The observer adds minimal overhead; the main cost scales with the number of nodes inside the scoped area. Keeping the scope tight reduces this cost.

Can I use SeaText with server‑side rendering (SSR) in Vue?

Yes. Render the scope attribute on the server‑generated HTML, then hydrate the client and call init() after hydration.

Does SeaText work with other SPA frameworks?

The same steps apply to React, Angular, or Svelte; only the lifecycle hooks differ.

Why Contacting Support Quickly Matters

An AI integration failure can stop your site from personalizing content, translating pages, or recovering ad spend from bots. Every minute of downtime costs you conversions and ad budget. Quick action limits the damage.

SeaText documentation states that if you encounter issues, you should reach out for support. The sooner you do, the faster the team can diagnose and fix the problem. Delaying only extends the disruption.

Preparing Diagnostic Evidence for Your Issue

Before you contact support, gather details about the failure. This helps the team understand the problem without back-and-forth questions.

Collect the following:

• Your site URL and the page where the integration is installed.
• The date and time when the issue started.
• Error messages from the browser console or network tab.
• Screenshots or recordings of the problem.
• Any recent changes to your site, such as code updates or plugin changes.

SeaText documentation mentions that for Single Page Applications, the snippet should be added in the body tag. Check if the snippet is still present and correctly placed.

How to Reach Support via the SeaText Documentation

The SeaText documentation is the only official source for support contact details. To submit a request:

1. Open the SeaText documentation page that covers installation or general help. For example, the “For SPAs” page includes a note to reach out for support.
2. Find the section labeled “Support” or “Contact”. The documentation may provide a contact form, an email address, or a ticket system.
3. Follow the instructions on that page. Provide the diagnostic evidence you collected.
4. Submit the request and note any confirmation you receive.

Do not use third-party forums or social media to report technical issues. Only the official documentation guarantees your request is handled properly.

Why the Documentation is Your Best Option

Using the documentation to contact support ensures you get accurate and up-to-date information. It is the only channel verified by SeaText. Other methods, such as asking on community sites, may lead to outdated or incorrect advice.

Trade-offs to consider:

• Speed: Submitting through the documentation is the fastest way to reach the right team. The documentation does not specify response times, but it is the direct path.
• Evidence required: You will need to provide diagnostic details. The more you prepare, the quicker the resolution.
• Ticket tracking: The documentation’s contact system may assign a ticket number. This helps you track progress and follow up.

If you are unsure which documentation page to use, start with the installation guide for your platform. It usually contains the support link.

What to Expect After Submitting a Support Request

The SeaText documentation does not specify the exact process after you submit a request. However, many support systems send an automated confirmation email with a ticket number. Check your inbox and spam folder for this message.

If you receive a ticket number, save it. You can use it to follow up on the status. The documentation does not mention a portal to check ticket status, so you may need to reply to the confirmation email or submit a new request if you do not hear back.

If you have not received a response within a reasonable time, submit another request through the documentation and reference the previous ticket number if available.

Preventing Common Integration Failures

Many integration issues can be avoided by following the setup guidelines in the documentation. Common causes of failures include:

• Incorrect snippet placement: The SeaText AI snippet must be added inside the body tag of every page. For SPAs, place it in the main index.html file.
• Asynchronous loading issues: The snippet includes the async attribute to load asynchronously. Ensure your site does not block this script.
• Local storage permissions: The snippet stores an ID in local storage. Your site must allow local storage access.
• Cross-origin conflicts: If your site interacts with multiple domains, the snippet may face cross-origin issues. Check the browser console for errors.
• Outdated snippet: Use the latest version from the documentation. The snippet is provided in the installation guide.

Regularly review the documentation for updates. The SeaText FAQ page may also have troubleshooting tips for common scenarios.

Frequently Asked Questions

How long does it take to get a response from SeaText support?

The SeaText documentation does not provide response time estimates. After submitting your request, wait for a confirmation email. If you do not receive one, check your spam folder or submit again.

What information should I include in my support ticket?

Include your site URL, the date and time the issue began, error messages, screenshots, and details about any recent changes. The more evidence you provide, the faster the team can help.

Is there a cost for contacting SeaText support?

The SeaText documentation does not mention any cost for support. Contacting support through the official documentation is likely included with your subscription.

Can I get phone support?

The SeaText documentation does not list a phone number for support. All contact methods are provided through the documentation pages.

What are the support hours?

The documentation does not specify support hours. Submit your request at any time; the team will respond when available.

How do I check the status of my ticket?

The documentation does not describe a ticket tracking system. If you received a confirmation email, you can reply to it to ask for an update. Otherwise, submit a new request referencing your previous submission.

What if the AI integration issue is related to billing?

The documentation does not provide a separate billing support channel. Use the same contact method for all issues, and mention that the problem is billing-related in your request.

Key Facts