fixup! jsplumb: Internet Explorer only supports "text" as format for evt.dataTransfer.setData

dream/platform/src/jsplumb/jsplumb.js

@@ -785,15 +785,21 @@
     function resolver(resolve, reject) {
       callback = function (evt) {
         try {
-          var class_name = JSON.parse(
-              evt.dataTransfer.getData('text')
-            ),
+            var class_name,
               offset = $(gadget.props.main).offset(),
               relative_position = convertToRelativePosition(
                 gadget,
                 evt.clientX - offset.left + "px",
                 evt.clientY - offset.top + "px"
               );
+            try {
+              // html5 compliant browser
+              class_name = JSON.parse(evt.dataTransfer.getData('application/json'));
+            } catch (e) {
+              // internet explorer
+              class_name = JSON.parse(evt.dataTransfer.getData('text'));
+            }
+
           addNode(gadget,
             generateNodeId(gadget, {_class: class_name}),
             {

dream/platform/src/jsplumb/test.js

@@ -184,8 +184,8 @@
             e.dataTransfer = {
               getData: function(type){
                  // make sure we are called properly
-                 equal('text', type,
-             "The drag&dropped element must have data type text");
+                 equal('application/json', type,
+             "The drag&dropped element must have data type application/json");
                  return JSON.stringify("Example.Node");
               }
             };
@@ -545,8 +545,8 @@
             e.dataTransfer = {
               getData: function(type){
                  // make sure we are called properly
-                 equal('text', type,
-             "The drag&dropped element must have data type text");
+                 equal('application/json', type,
+             "The drag&dropped element must have data type application/json");
                  return JSON.stringify("Example.Node");
               }
             };
@@ -647,8 +647,8 @@
             e.dataTransfer = {
               getData: function(type){
                  // make sure we are called properly
-                 equal('text', type,
-             "The drag&dropped element must have data type text");
+                 equal('application/json', type,
+             "The drag&dropped element must have data type application/json");
                  return JSON.stringify("Example.Node");
               }
             };

dream/platform/src/toolbox/toolbox.js

@@ -17,8 +17,16 @@
 
       callback = function (evt) {
         try {
-          evt.dataTransfer.setData('text',
-            tool.dataset.class_name);
+          // Internet explorer only accepts text and URI as types for dataTranser
+          // but firefox will replace location.href with the data if type is set to
+          // text or URI. We try to use application/json as type, and if it fails
+          // fallback to text.
+          try {
+            // IE will raise an error setting this.
+            evt.dataTransfer.setData('application/json', tool.dataset.class_name);
+          } catch (e) {
+            evt.dataTransfer.setData('text', tool.dataset.class_name);
+          }
         } catch (e) {
           reject(e);
         }