MDL-32654 Improve course javascript status spinner

lib/javascript-static.js

@@ -833,6 +833,31 @@ M.util.add_lightbox = function(Y, node) {
     return lightbox;
 }
 
+/**
+ * Appends a hidden spinner element to the specified node.
+ *
+ * @param {YUI} Y
+ * @param {Node} the node the spinner should be added to
+ * @return {Node} created spinner node
+ */
+M.util.add_spinner = function(Y, node) {
+    var WAITICON = {'pix':"i/loading_small",'component':'moodle'};
+
+    // Check if spinner is already there
+    if (node.one('.spinner')) {
+        return node.one('.spinner');
+    }
+
+    var spinner = Y.Node.create('<img />')
+        .setAttribute('src', M.util.image_url(WAITICON.pix, WAITICON.component))
+        .addClass('spinner')
+        .addClass('iconsmall')
+        .hide();
+
+    node.append(spinner);
+    return spinner;
+}
+
 //=== old legacy JS code, hopefully to be replaced soon by M.xx.yy and YUI3 code ===
 
 function checkall() {