Overlay-style spinner for items with images

drag_and_drop_v2/public/css/drag_and_drop.css

@@ -85,6 +85,22 @@
     float: left;
 }
 
+.xblock--drag-and-drop .drag-container .option.option-with-image .spinner-wrapper {
+    position: absolute;
+    float: none;
+    left: 0;
+    right: 0;
+    top: 0;
+    bottom: 0;
+    background-color: #000;
+    opacity: 0.6;
+    color: #fff;
+    margin: 0;
+    display: flex;
+    justify-content: center; /* align horizontal */
+    align-items: center; /* align vertical */
+}
+
 .xblock--drag-and-drop .drag-container .option .item-content {
     display: inline-block;
 }

drag_and_drop_v2/public/js/drag_and_drop.js

@@ -316,7 +316,8 @@ function DragAndDropBlock(runtime, element, configuration) {
                 class_name: item_user_state && ('input' in item_user_state || item_user_state.correct_input) ? 'fade': undefined,
                 xhr_active: (item_user_state && item_user_state.submitting_location),
                 input: input,
-                content_html: item.backgroundImage ? '<img src="' + item.backgroundImage + '"/>' : item.displayName
+                content_html: item.backgroundImage ? '<img src="' + item.backgroundImage + '"/>' : item.displayName,
+                has_image: !!item.backgroundImage
             };
             if (item_user_state) {
                 itemProperties.is_placed = true;

drag_and_drop_v2/public/js/view.js

@@ -54,6 +54,7 @@
 
     var itemTemplate = function(item) {
         var style = {};
+        var className = (item.class_name) ? item.class_name : "";
         if (item.background_color) {
             style['background-color'] = item.background_color;
         }
@@ -64,11 +65,14 @@
             style.left = item.x_percent + "%";
             style.top = item.y_percent + "%";
         }
+        if (item.has_image) {
+            className += " " + "option-with-image";
+        }
         return (
             h('div.option',
                 {
                     key: item.value,
-                    className: item.class_name,
+                    className: className,
                     attributes: {'data-value': item.value, 'data-drag-disabled': item.drag_disabled},
                     style: style
                 }, [