Advanced Forms — workaround for WYSIWYG fields failing to initialise on paginated form pages 2+ (Hookturn ticket #9201). Proper fix queued for AF v1.9.3.9.

af-wysiwyg-paginated-fix.js

/**
 * Advanced Forms — WYSIWYG fix for paginated forms
 * ----------------------------------------------------------------
 * Workaround for a known bug in Advanced Forms ≤ 1.9.3.8:
 * when a WYSIWYG (TinyMCE) field is placed on page 2 (or later)
 * of a paginated form, it fails to initialise — the toolbar renders
 * but you cannot click into the editor or type.
 *
 * This snippet hooks Advanced Forms' page-change action and
 * re-initialises any visible WYSIWYG editor on the new page.
 * Content typed on a previous visit is preserved across page changes.
 *
 * A proper plugin fix is planned for v1.9.3.9. Once that ships
 * this snippet can be removed.
 *
 * --- How to install ---
 *
 * Option 1 — Theme functions.php (recommended):
 *
 *   add_action( 'wp_footer', function() {
 *       if ( ! wp_script_is( 'af-forms-script', 'enqueued' ) ) {
 *           return;
 *       }
 *       ?>
 *       <script>
 *       // paste the IIFE below
 *       </script>
 *       <?php
 *   }, 99 );
 *
 * Option 2 — A "Code Snippets"-style plugin: paste the IIFE below
 * as a frontend snippet (no wrapping <script> tags).
 *
 * Option 3 — Custom HTML block on the form page itself: paste the
 * IIFE wrapped in <script>…</script>.
 */
(function () {
    if (typeof window.acf === 'undefined' || !window.acf.addAction) return;
    var $ = window.jQuery;

    window.acf.addAction('af/form/page_changed', function (page, previousPage, form) {
        form.$el.find('.acf-field-wysiwyg').each(function () {
            var $field = $(this);
            if (!$field.is(':visible')) return;

            var fieldInstance = window.acf.getField($field);
            if (!fieldInstance) return;

            if (typeof fieldInstance.disableEditor === 'function') {
                fieldInstance.disableEditor();
            }
            // Defer one tick so the layout settles before TinyMCE re-inits.
            setTimeout(function () {
                fieldInstance.initializeEditor();
            }, 50);
        });
    });
})();