From 6d48faa96af211665bbc1a06cf4e1ac3b26bc865 2014-09-13 20:27:52
From: sylvain.corlay <sylvain.corlay@gmail.com>
Date: 2014-09-13 20:27:52
Subject: [PATCH] Added on_bulk_change method in WidgetModel

---

diff --git a/IPython/html/static/widgets/js/widget.js b/IPython/html/static/widgets/js/widget.js
index 8dcda6d..730c319 100644
--- a/IPython/html/static/widgets/js/widget.js
+++ b/IPython/html/static/widgets/js/widget.js
@@ -264,6 +264,14 @@ define(["widgets/js/manager",
             }
         },
 
+        on_bulk_change: function(keys, callback, context) {
+            this.on('change', function() {
+                if (keys.some(this.hasChanged, this)) {
+                    callback.apply(context);
+                }
+            }, this);
+
+       },
     });
     widgetmanager.WidgetManager.register_widget_model('WidgetModel', WidgetModel);