How to Update SeaText AI Scope for Dynamic SPA Content Changes

To keep SeaText AI translations and personalizations in sync with dynamically updated SPA content (such as AJAX-loaded blocks, modals, or infinite scroll items), call seatext.retranslate(scopeElement) immediately after any DOM mutation that adds new translatable nodes to your page. This method tells SeaText to scan the specified scope element for new content and apply the correct translations, variants, and personalization rules without requiring a full page reload.

Why Dynamic SPA Scope Updates Matter

Single-page applications (SPAs) load a single HTML page upfront and update content dynamically as users interact with the site, rather than reloading the full page for each navigation. SeaText AI scans and processes page content on initial load to apply translations, A/B test variants, and visitor-specific personalizations. If new content is added to the DOM after this initial scan (for example, a product list loaded via AJAX when a user scrolls to the bottom of a page, or a sign-up modal triggered by a button click), SeaText will not automatically process that new content unless you trigger a scope update. Failing to call the retranslate method for dynamic content will leave new text untranslated, unpersonalized, and excluded from A/B tests, leading to inconsistent user experiences and missed conversion opportunities.

Prerequisites for Retranslating SPA Content

Before implementing dynamic scope updates, confirm you have completed the base SeaText SPA integration:

• The SeaText AI JavaScript snippet is installed in your SPA’s entry point (typically index.html or your framework’s main initialization file)
• The snippet loads asynchronously to avoid blocking page render, as recommended in SeaText’s SPA documentation
• Your application has permission to access local storage, as the SeaText snippet stores a minimal session ID in local storage to track user-specific variants and translations
• If your SPA interacts with multiple domains, you have confirmed cross-origin compatibility with the SeaText script to avoid loading errors

If you have not yet completed the base integration, refer to SeaText’s SPA setup guide for React, Vue, or Angular before proceeding.

Step-by-Step Process to Update SeaText AI Scope

Follow these ordered steps to keep SeaText in sync with all dynamic SPA content:

1. Identify all DOM mutation points in your SPA: Map every user action or system event that adds new translatable content to the DOM. Common examples include infinite scroll loaders, AJAX form submissions that return new content, modal open/close events, tab switches, and filter/sort updates that refresh product or content lists.
2. Attach the retranslate call to each mutation event: After the new content is fully inserted into the DOM, call seatext.retranslate(scopeElement), passing the parent element that contains the new translatable nodes as the argument. For example, if you load new product cards into a <div class="product-grid"> element, pass that element to the retranslate method to limit processing to only the new content, which improves performance.
3. Handle asynchronous content loads correctly: If your dynamic content loads via a fetch or AJAX request, place the retranslate call inside the success callback of the request, after the new content has been appended to the DOM. For promise-based fetch calls, this looks like: fetch('/api/products').then(response => response.json()).then(data => { renderProducts(data); seatext.retranslate(document.querySelector('.product-grid')); })
4. Test with all dynamic content types: Verify the retranslate call works for every mutation point you identified, including edge cases like failed AJAX requests, slow network loads, and rapid user interactions that trigger multiple mutations in quick succession.

Integrating with State Management Libraries (Redux, Vuex, Pinia)

If your SPA uses a state management library to handle data and UI updates, you can centralize your SeaText retranslate calls to avoid repeating code across individual components. The exact implementation varies by library, but the core pattern is the same: trigger the retranslate call after the state update that adds new translatable content to the DOM.

Redux Integration Example

For Redux, you can use a store subscriber to watch for state changes that add new content. For example, if you have a productsLoaded action that adds new products to the state, call retranslate after the component re-renders with the new data:

store.subscribe(() => {
  const state = store.getState();
  if (state.products.newItemsLoaded) {
    seatext.retranslate(document.querySelector('.product-grid'));
    // Reset the flag if needed to avoid repeated calls
    store.dispatch(resetNewItemsLoadedFlag());
  }
});

Vuex/Pinia Integration Example

For Vuex or Pinia, you can call retranslate in a watcher that monitors the state property that stores your dynamic content, or in the updated lifecycle hook of the component that renders the dynamic content:

watch(() => store.state.products.items, (newItems) => {
  if (newItems.length > previousItemsLength) {
    seatext.retranslate(document.querySelector('.product-grid'));
  }
});

This approach reduces duplicate code and ensures you never miss a retranslate call when content updates via your central state store.

Common Mistakes to Avoid

• Calling retranslate before new content is added to the DOM: The retranslate method only scans content that exists in the DOM at the time of the call. If you call it before your AJAX request completes and appends new content, SeaText will not process the new nodes. Always place the call after the content is fully inserted.
• Passing an overly broad scope element: Passing document.body as the scope element will cause SeaText to scan the entire page for new content, which can cause performance issues on large SPAs. Always pass the smallest possible parent element that contains only the new translatable content.
• Forgetting to handle modal and hidden content: Modals that are hidden by default (with display: none) may not be processed on initial load. Call retranslate on the modal’s container element when the modal is opened to ensure its content is translated.
• Ignoring error handling for failed content loads: If an AJAX request fails and no new content is added, you do not need to call retranslate. Add conditional logic to only call the method when new content is successfully inserted to avoid unnecessary processing.

Verifying Your Scope Updates Work

After implementing your retranslate calls, verify that dynamic content is being processed correctly:

1. Open your SPA in a browser and open the Developer Tools (F12) to view the Console and Network tabs.
2. Trigger a dynamic content update (for example, scroll to load more products, or open a modal).
3. Check the Network tab for a request to SeaText’s processing endpoint when the retranslate call runs. If no request appears, confirm that the retranslate call is firing after the content is added to the DOM.
4. Inspect the new dynamic content to confirm that all text is translated, personalized, or shows the correct A/B test variant, matching the behavior of content loaded on initial page load.
5. Test across all supported browsers and devices to confirm consistent behavior, especially for SPAs that use client-side routing.

Key Facts About SeaText SPA Integration

The table below summarizes core details for SeaText’s SPA support, pulled from official documentation:

Frequently Asked Questions

Do I need to call retranslate for every small DOM change?

No, you only need to call retranslate after mutations that add new translatable text nodes to the DOM. Small changes like updating a single button’s text via JavaScript do not require a retranslate call, as long as the text is set directly in the DOM. For bulk content additions (infinite scroll, AJAX lists, modals), call retranslate on the parent container of the new content.

Will retranslate affect my A/B test variants?

No, retranslate will apply the correct A/B test variant to new content, matching the variant assigned to the user’s session. If a user is assigned to variant B of a headline test, any new headlines added dynamically will also use variant B text.

Does retranslate work for content loaded in iframes?

No, the retranslate method only processes content in the parent page’s DOM. If you load content in cross-origin iframes, you will need to install the SeaText snippet in the iframe’s source page and call retranslate within the iframe’s context.

How often can I call retranslate without hurting performance?

You can call retranslate as often as needed for dynamic content updates. The method is optimized to only scan the specified scope element, so calling it on a small parent container (like a product grid or modal wrapper) has minimal performance impact, even on large SPAs.

What happens if I forget to call retranslate for new content?

New content added to the DOM without a retranslate call will remain in its original, untranslated language, will not receive visitor-specific personalizations, and will be excluded from active A/B tests. This leads to inconsistent user experiences and can reduce conversion rates for users who see untranslated or unoptimized content.