Ensured kernel is defined before widget creates comm

holoviz · Sep 16, 2016 · a864f9d · a864f9d
1 parent 1be51ee
commit a864f9d
Showing 1 changed file with 5 additions and 3 deletions.
diff --git a/holoviews/plotting/widgets/widgets.js b/holoviews/plotting/widgets/widgets.js
@@ -98,9 +98,11 @@ HoloViewsWidget.prototype.update = function(current){
 
 HoloViewsWidget.prototype.init_comms = function() {
 	var widget = this;
-	var comm_manager = Jupyter.notebook.kernel.comm_manager
-	comm = comm_manager.new_comm(this.id, {}, {}, {}, this.id);
-	comm.on_msg(function (msg) { widget.process_msg(msg) })
+	if ((window.Jupyter !== undefined) && (Jupyter.notebook.kernel !== undefined)) {
+		var comm_manager = Jupyter.notebook.kernel.comm_manager
+		comm = comm_manager.new_comm(this.id, {}, {}, {}, this.id);
+		comm.on_msg(function (msg) { widget.process_msg(msg) })
+	}
 }
 
 HoloViewsWidget.prototype.process_msg = function(msg) {