Support existing 'events' attribute as function

Stickit binds to form and contentEditable element changes by adding
bindings to a view's 'events' attribute, which may already exist on the view.

This commit updates stickit() to support an existing 'events' attribute
that is specified as a function, which is already allowed by Backbone.

backbone.stickit.js

@@ -33,7 +33,13 @@
 
 			this.unstickModel(model);
 
-			this.events || (this.events = {});
+			// this.events may be a function, but we want to add new event bindings
+			// to it. Creating our own stickitEvents property allows us to add
+			// bindings while allowing this.events to remain a function. This also
+			// supports multiple calls to stickit() in a single Backbone View.
+			this.stickitEvents = _(_.result(this, 'events') || {}).extend(
+				this.stickitEvents
+			);
 
 			// Iterate through the selectors in the bindings configuration and configure
 			// the various options for each field.
@@ -116,7 +122,7 @@
 					if (isFormEl($el) || isContenteditable($el)) {
 						// Bind events to the element which will update the model with changes.
 						_.each(config.eventsOverride || getModelEvents($el), function(type) {
-							self.events[type+'.stickit '+selector] = function() {
+							self.stickitEvents[type+'.stickit '+selector] = function() {
 								var val = getElVal($el, isContenteditable($el));
 								// Don't update the model if false is returned from the `updateModel` configuration.
 								if (evaluateBoolean(self, config.updateModel, val, modelAttr))
@@ -137,9 +143,9 @@
 					updateViewBindEl(self, $el, config, getVal(model, modelAttr, config, self), model, true);
 				}
 			});
-			
-			// We added to `this.events` so we need to re-delegate.
-			this.delegateEvents();
+
+			// We added to `this.stickitEvents` so we need to re-delegate.
+			this.delegateEvents(this.stickitEvents);
 
 			// Wrap remove so that we can remove model events when this view is removed.
 			this.remove = _.wrap(this.remove, function(oldRemove) {

test/bindData.js

@@ -220,6 +220,118 @@ $(document).ready(function() {
 		equal(model2.get('candy'), 'butterfinger');
 	});
 
+	test('stickit (existing events property as hash with multiple models and bindings)', function() {
+
+		var model1, testView;
+
+		model1 = new (Backbone.Model)({id:1, candy:'twix' });
+		model2 = new (Backbone.Model)({id:2, candy:'snickers'});
+
+		testView = new (Backbone.View.extend({
+
+			initialize: function() {
+				this.model = model1;
+				this.otherModel = model2;
+			},
+
+			events: {
+				click: 'handleClick'
+			},
+
+			bindings: {
+				'#test0-textarea': 'candy'
+			},
+
+			otherBindings: {
+				'#test0-input': 'candy'
+			},
+
+			render: function() {
+				var html = document.getElementById('jst0').innerHTML;
+				this.$el.html(_.template(html)());
+				this.stickit();
+				this.stickit(this.otherModel, this.otherBindings);
+				return this;
+			},
+
+			handleClick: function() {
+				this.clickHandled = true;
+			}
+
+		}))();
+
+		$('#qunit-fixture').html(testView.render().el);
+
+		testView.$('#test0-textarea').val('kit kat').keyup();
+		testView.$('#test0-input').val('butterfinger').keyup();
+
+		equal(model1.get('candy'), 'kit kat');
+		equal(model2.get('candy'), 'butterfinger');
+
+		testView.$el.click();
+
+		equal(testView.clickHandled, true);
+
+	});
+
+	test('stickit (existing events property as function with multiple models and bindings)', function() {
+
+		var model1, testView;
+
+		model1 = new (Backbone.Model)({id:1, candy:'twix' });
+		model2 = new (Backbone.Model)({id:2, candy:'snickers'});
+
+		testView = new (Backbone.View.extend({
+
+			initialize: function() {
+				this.model = model1;
+				this.otherModel = model2;
+			},
+
+			events: function() {
+
+				var self = this;
+
+				return {
+					click: function() {
+						self.clickHandled = true;
+					}
+				};
+
+			},
+
+			bindings: {
+				'#test0-textarea': 'candy'
+			},
+
+			otherBindings: {
+				'#test0-input': 'candy'
+			},
+
+			render: function() {
+				var html = document.getElementById('jst0').innerHTML;
+				this.$el.html(_.template(html)());
+				this.stickit();
+				this.stickit(this.otherModel, this.otherBindings);
+				return this;
+			}
+
+		}))();
+
+		$('#qunit-fixture').html(testView.render().el);
+
+		testView.$('#test0-textarea').val('kit kat').keyup();
+		testView.$('#test0-input').val('butterfinger').keyup();
+
+		equal(model1.get('candy'), 'kit kat');
+		equal(model2.get('candy'), 'butterfinger');
+
+		testView.$el.click();
+
+		equal(testView.clickHandled, true);
+
+	});
+
 	test('bindings:setOptions', function() {
 
 		model.set({'water':'fountain'});