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src/views/InstructorView.js

@@ -726,11 +726,20 @@ export function setupInstructorEvents() {
 
     // --- Transposed Heatmap Renderer ---
     function renderTransposedHeatmap(users) {
+        console.log("renderTransposedHeatmap called with users:", users.length);
+
         const container = document.getElementById('heatmap-container');
-        if (!container) return; // Might be hidden
+        console.log("heatmap-container element:", container);
+
+        if (!container) {
+            console.error("renderTransposedHeatmap: heatmap-container not found!");
+            return; // Might be hidden
+        }
 
         // Make sure challenges are loaded (might be empty initially)
+        console.log("cachedChallenges length:", cachedChallenges.length);
         if (cachedChallenges.length === 0) {
+            console.warn("renderTransposedHeatmap: No challenges loaded, showing loading message");
             container.innerHTML = '<div class="text-gray-500 text-center p-4">載入題目中...</div>';
             return;
         }