Fixed #1437: Restored `data` property of the update event of DataSet.

docs/data/dataset.html

@@ -599,9 +599,8 @@ function (event, properties, senderId) {
         <code>properties</code> is always an object containing a property
         <code>items</code>, which contains an array with the ids of the affected
         items. The <code>update</code> event has an extra field <code>oldData</code>
-        containing the original data of the updated items, which allows to
-        determine the changed fields of the changed items when comparing to
-        the new item properties.
+        containing the original data of the updated items, and a field <code>data</code>
+        containing the changes: the properties of the items that are being updated.
       </td>
     </tr>
     <tr>

lib/DataSet.js

@@ -236,6 +236,7 @@ DataSet.prototype.add = function (data, senderId) {
 DataSet.prototype.update = function (data, senderId) {
   var addedIds = [];
   var updatedIds = [];
+  var oldData = [];
   var updatedData = [];
   var me = this;
   var fieldId = me._fieldId;
@@ -243,11 +244,12 @@ DataSet.prototype.update = function (data, senderId) {
   var addOrUpdate = function (item) {
     var id = item[fieldId];
     if (me._data[id]) {
-      var oldData = util.extend({}, me._data[id]);
+      var oldItem = util.extend({}, me._data[id]);
       // update item
       id = me._updateItem(item);
       updatedIds.push(id);
-      updatedData.push(oldData);
+      updatedData.push(item);
+      oldData.push(oldItem);
     }
     else {
       // add new item
@@ -274,14 +276,14 @@ DataSet.prototype.update = function (data, senderId) {
     this._trigger('add', {items: addedIds}, senderId);
   }
   if (updatedIds.length) {
-	var props = { items: updatedIds, oldData: updatedData };
-	// TODO: remove deprecated property 'data' some day
-	Object.defineProperty(props, 'data', {
-	  'get': (function() {
-	    console.warn('Property data is deprecated. Use DataSet.get(ids) to retrieve the new data, use the oldData property on this object to get the old data');
-	    return this.get(updatedIds);
-	  }).bind(this)
-	});
+    var props = { items: updatedIds, oldData: oldData, data: updatedData };
+    // TODO: remove deprecated property 'data' some day
+    //Object.defineProperty(props, 'data', {
+    //  'get': (function() {
+    //    console.warn('Property data is deprecated. Use DataSet.get(ids) to retrieve the new data, use the oldData property on this object to get the old data');
+    //    return updatedData;
+    //  }).bind(this)
+    //});
     this._trigger('update', props, senderId);
   }