Addressed review feedback.

common/static/js/capa/drag_and_drop/base_image.js

@@ -17,7 +17,9 @@ define([], function () {
             '></div>'
         );
 
-        state.baseImageEl = $('<img alt="drop target image" />');
+        state.baseImageEl = $('<img />', {
+                alt: gettext("Drop target image")
+            });
 
         state.baseImageEl.attr('src', state.config.baseImage);
         state.baseImageEl.load(function () {

common/static/js/capa/drag_and_drop/draggable_events.js

@@ -63,7 +63,6 @@ return {
                 });
                 this.iconEl.appendTo(this.state.baseImageEl.parent());
 
-
                 if (this.labelEl !== null) {
                     if (this.isOriginal === true) {
                         this.labelEl.detach();
@@ -83,9 +82,10 @@ return {
                 if (this.isOriginal === true) {
                     this.state.numDraggablesInSlider -= 1;
                 }
-                SR.readText(gettext('dragging out of slider'));
+                // SR: global "screen reader" object in accessibility_tools.js
+                window.SR.readText(gettext('dragging out of slider'));
             } else {
-                SR.readText(gettext('dragging'));
+                window.SR.readText(gettext('dragging'));
             }
 
             this.zIndex = 1000;
@@ -107,9 +107,9 @@ return {
 
             this.checkLandingElement();
             if (this.inContainer === true) {
-                SR.readText(gettext('dropped in slider'));
+                window.SR.readText(gettext('dropped in slider'));
             } else {
-                SR.readText(gettext('dropped on target'));
+                window.SR.readText(gettext('dropped on target'));
             }
             this.toggleTargets(false);
         }

common/static/js/capa/drag_and_drop/draggable_logic.js

@@ -236,15 +236,13 @@ return {
         return false;
     },
 
-    'toggleTargets': function (onoff) {
-        var c1, target, effect;
-        effect = (onoff ? 'move' : undefined);
+    'toggleTargets': function (isEnabled) {
+        var effect = (isEnabled ? 'move' : undefined);
         this.state.baseImageEl.attr('aria-dropeffect', effect);
 
-        for (c1 = 0; c1 < this.state.targets.length; c1 += 1) {
-            target = this.state.targets[c1];
+        $.each(this.state.targets, function (target) {
             target.targetEl.attr('aria-dropeffect', effect);
-        }
+        });
     },
 
     'snapToTarget': function (target) {