Upgrade 1-11.38

main/lp/scorm_api.php

@@ -49,6 +49,18 @@ $autocomplete_when_80pct = 0;
 $user = api_get_user_info();
 $userId = api_get_user_id();
 
+// Pre-load initialization data for the initial item via PHP so that
+// LMSInitialize() can skip its synchronous AJAX call on first load.
+require_once __DIR__.'/lp_initialize_item.inc.php';
+$initialItemId = $oItem->get_id();
+$initialItemViewId = $oLP->get_view(null, $userId) ?: 1;
+$initialItemScript = initialize_item(
+    $oLP->get_id(),
+    $userId,
+    $initialItemViewId,
+    $initialItemId
+);
+
 $extraParams = '';
 if (isset($oLP->lti_launch_id)) {
     $extraParams .= '&lti_launch_id='.Security::remove_XSS($oLP->lti_launch_id);
@@ -222,7 +234,13 @@ olms.userfname = '<?php echo addslashes(trim($user['firstname'])); ?>';
 olms.userlname = '<?php echo addslashes(trim($user['lastname'])); ?>';
 olms.execute_stats = false;
 
-var courseUrl = '?cidReq='+olms.lms_course_code+'&id_session='+olms.lms_session_id+'<?php echo $extraParams; ?>';
+// Initialization data for the initial item, pre-loaded by PHP.
+// LMSInitialize() uses this to skip its synchronous AJAX call on first load.
+// For subsequent items (after navigation), LMSInitialize() still uses AJAX.
+var olmsPreloadedItemId = <?php echo (int) $initialItemId; ?>;
+<?php echo $initialItemScript; ?>
+
+var courseUrl ='?cidReq='+olms.lms_course_code+'&id_session='+olms.lms_session_id+'<?php echo $extraParams; ?>';
 var statsUrl = 'lp_controller.php' + courseUrl + '&action=stats';
 
 /**
@@ -299,24 +317,50 @@ function LMSInitialize() {
         //reinit the list of modified variables
         reinit_updatable_vars_list();
 
-        // Get LMS values for this item
-        var params = {
-            'lid': olms.lms_lp_id,
-            'uid': olms.lms_user_id,
-            'vid': olms.lms_view_id,
-            'iid': olms.lms_item_id
-        };
+        if (typeof olmsPreloadedItemId !== 'undefined' && olmsPreloadedItemId == olms.lms_item_id) {
+            // Initial item: initialization data was pre-loaded by PHP inline.
+            // No AJAX call needed; all olms.* variables are already set.
+            logit_scorm('LMSInitialize() using pre-loaded data for item ' + olms.lms_item_id);
+            olmsPreloadedItemId = undefined; // clear so subsequent items use AJAX
+            $('video:not(.skip), audio:not(.skip)').mediaelementplayer();
+        } else {
+            // Subsequent items (after navigation): use pre-fetched data if
+            // switch_item() had time to complete the fetch, otherwise fall
+            // back to synchronous AJAX (should be extremely rare in practice).
+            var nextItemId = parseInt(olms.lms_item_id, 10);
+            var cached = olmsInitDataCache[nextItemId];
 
-        $.ajax({
-            type: "POST",
-            url: "lp_ajax_initialize.php" + courseUrl,
-            data: params,
-            dataType: 'script',
-            async: false,
-            success:function(data) {
+            if (cached && cached.resolved) {
+                logit_scorm('LMSInitialize() using pre-fetched data for item ' + nextItemId);
+                $.globalEval(cached.script);
+                delete olmsInitDataCache[nextItemId];
                 $('video:not(.skip), audio:not(.skip)').mediaelementplayer();
+            } else {
+                // Pre-fetch either hasn't resolved yet or failed. This is the
+                // rare fallback path (sync AJAX, still deprecated but harmless
+                // as a safety net until pre-fetch covers all cases reliably).
+                if (cached) {
+                    logit_scorm('LMSInitialize() pre-fetch not ready for item ' + nextItemId + ', using sync AJAX fallback', 1);
+                    delete olmsInitDataCache[nextItemId];
+                }
+                var params = {
+                    'lid': olms.lms_lp_id,
+                    'uid': olms.lms_user_id,
+                    'vid': olms.lms_view_id,
+                    'iid': olms.lms_item_id
+                };
+                $.ajax({
+                    type: "POST",
+                    url: "lp_ajax_initialize.php" + courseUrl,
+                    data: params,
+                    dataType: 'script',
+                    async: false,
+                    success: function(data) {
+                        $('video:not(.skip), audio:not(.skip)').mediaelementplayer();
+                    }
+                });
             }
-        });
+        }
 
         olms.lms_initialized = 1;
         olms.switch_finished = 1;
@@ -1496,6 +1540,61 @@ function reinit_updatable_vars_list() {
     olms.lesson_status = defaultStatus;
 }
 
+/**
+ * Cache for pre-fetched item initialization data, keyed by numeric item ID.
+ * Each entry: {resolved: bool, script: string|null, failed: bool}
+ */
+var olmsInitDataCache = {};
+
+/**
+ * Start an async fetch of initialization data for the given item ID.
+ * Called from switch_item() as soon as the target item ID is known, so the
+ * data is ready (or very nearly so) by the time LMSInitialize() fires after
+ * the new content loads in the iframe.
+ * Falls back gracefully: if this fetch fails or hasn't resolved by the time
+ * LMSInitialize() is called, a synchronous AJAX call is used instead.
+ */
+function prefetchInitData(itemId) {
+    itemId = parseInt(itemId, 10);
+    if (!itemId || olmsInitDataCache[itemId]) {
+        return; // invalid ID, or already fetching/fetched for this item
+    }
+
+    var entry = {resolved: false, script: null, failed: false};
+    var body = 'lid=' + encodeURIComponent(olms.lms_lp_id) +
+               '&uid=' + encodeURIComponent(olms.lms_user_id) +
+               '&vid=' + encodeURIComponent(olms.lms_view_id) +
+               '&iid=' + encodeURIComponent(itemId);
+
+    if (typeof fetch === 'function') {
+        fetch('lp_ajax_initialize.php' + courseUrl, {
+            method: 'POST',
+            headers: {'Content-Type': 'application/x-www-form-urlencoded'},
+            body: body
+        })
+        .then(function(response) {
+            if (!response.ok) {
+                throw new Error('HTTP ' + response.status);
+            }
+            return response.text();
+        })
+        .then(function(script) {
+            entry.script = script;
+            entry.resolved = true;
+        })
+        .catch(function(err) {
+            entry.failed = true;
+            logit_lms('prefetchInitData() failed for item ' + itemId + ': ' + err, 1);
+        });
+    } else {
+        // fetch() not available (IE11); mark as failed so LMSInitialize()
+        // uses its synchronous AJAX fallback.
+        entry.failed = true;
+    }
+
+    olmsInitDataCache[itemId] = entry;
+}
+
 /**
  * Function that handles the saving of an item and switching from an item to another.
  * Once called, this function should be able to do the whole process of
@@ -1702,6 +1801,11 @@ function switch_item(current_item, next_item)
             break;
     }
 
+    // Start fetching init data for the next item now, in parallel with the
+    // iframe loading its content. By the time the SCO calls LMSInitialize(),
+    // the data will almost certainly already be available.
+    prefetchInitData(next_item);
+
     var mysrc = '<?php echo api_get_path(WEB_CODE_PATH); ?>lp/lp_controller.php?action=content&lp_id=' + olms.lms_lp_id +
                 '&item_id=' + next_item + '&cidReq=' + olms.lms_course_code + '&id_session=' + olms.lms_session_id;
     var cont_f = $("#content_id");