quick review pass on javascript

IPython/html/static/notebook/js/widgets/widget.js

@@ -21,7 +21,7 b' function(WidgetManager, Underscore, Backbone){'
 
     var WidgetModel = Backbone.Model.extend({
         constructor: function (widget_manager, model_id, comm) {
-            // Construcctor
+            // Constructor
             //
             // Creates a WidgetModel instance.
             //
@@ -111,7 +111,7 b' function(WidgetManager, Underscore, Backbone){'
                     if (this.msg_buffer !== null &&
                         this.msg_throttle === this.pending_msgs) {
                         var data = {method: 'backbone', sync_method: 'update', sync_data: this.msg_buffer};
-                        this.comm.send(data, callbacks);  
+                        this.comm.send(data, callbacks);
                         this.msg_buffer = null;
                     } else {
                         --this.pending_msgs;
@@ -131,7 +131,7 b' function(WidgetManager, Underscore, Backbone){'
             var that = this;
             callbacks.iopub.status = function (msg) {
                 that._handle_status(msg, callbacks);
-            }
+            };
             return callbacks;
         },
 
@@ -141,7 +141,7 b' function(WidgetManager, Underscore, Backbone){'
             // Make sure a comm exists.
             var error = options.error || function() {
                 console.error('Backbone sync error:', arguments);
-            }
+            };
             if (this.comm === undefined) {
                 error();
                 return false;
@@ -233,7 +233,7 b' function(WidgetManager, Underscore, Backbone){'
                 return unpacked;
             } else {
                 var model = this.widget_manager.get_model(value);
-                if (model !== null) {
+                if (model) {
                     return model;
                 } else {
                     return value;
@@ -279,7 +279,7 b' function(WidgetManager, Underscore, Backbone){'
             var view = this.child_views[child_model.id];
             if (view !== undefined) {
                 delete this.child_views[child_model.id];
-                view.remove();    
+                view.remove();
             }
         },
 
@@ -373,7 +373,7 b' function(WidgetManager, Underscore, Backbone){'
             // to render
             var e = this.$el;
             var visible = this.model.get('visible');
-            setTimeout(function() {e.toggle(visible)},0);
+            setTimeout(function() {e.toggle(visible);},0);
      
             var css = this.model.get('_css');
             if (css === undefined) {return;}
@@ -387,17 +387,16 b' function(WidgetManager, Underscore, Backbone){'
                     });
                 }
             });
-                    
         },
 
         _get_selector_element: function (selector) {
-            // Get the elements via the css selector.  
+            // Get the elements via the css selector.
 
             // If the selector is blank, apply the style to the $el_to_style 
             // element.  If the $el_to_style element is not defined, use apply 
             // the style to the view's element.
             var elements;
-            if (selector === undefined || selector === null || selector === '') {
+            if (!selector) {
                 if (this.$el_to_style === undefined) {
                     elements = this.$el;
                 } else {

IPython/html/static/notebook/js/widgets/widget_button.js

@@ -16,7 +16,7 b''
 
 define(["notebook/js/widgets/widget"], function(WidgetManager){
 
-    var ButtonView = IPython.DOMWidgetView.extend({  
+    var ButtonView = IPython.DOMWidgetView.extend({
         render : function(){
             // Called when view is rendered.
             this.setElement($("<button />")

IPython/html/static/notebook/js/widgets/widget_container.js

@@ -16,22 +16,21 b''
 
 define(["notebook/js/widgets/widget"], function(WidgetManager) {
 
-    var ContainerView = IPython.DOMWidgetView.extend({    
+    var ContainerView = IPython.DOMWidgetView.extend({
         render: function(){
             // Called when view is rendered.
-            this.$el
-                .addClass('widget-container');
+            this.$el.addClass('widget-container');
             this.children={};
             this.update_children([], this.model.get('_children'));
             this.model.on('change:_children', function(model, value, options) {
                 this.update_children(model.previous('_children'), value);
             }, this);
-            this.update()
+            this.update();
         },
         
         update_children: function(old_list, new_list) {
             // Called when the children list changes.
-            this.do_diff(old_list, 
+            this.do_diff(old_list,
                 new_list, 
                 $.proxy(this.remove_child_model, this),
                 $.proxy(this.add_child_model, this));
@@ -57,17 +56,16 b' define(["notebook/js/widgets/widget"], function(WidgetManager) {'
             return ContainerView.__super__.update.apply(this);
         },
     });
+    
     WidgetManager.register_widget_view('ContainerView', ContainerView);
-
-
-    var PopupView = IPython.DOMWidgetView.extend({ 
+    
+    var PopupView = IPython.DOMWidgetView.extend({
         render: function(){
             // Called when view is rendered.
             var that = this;
             this.children={};
             
-            this.$el
-                .on("remove", function(){
+            this.$el.on("remove", function(){
                     that.$window.remove();
                 });
             this.$window = $('<div />')

IPython/html/static/notebook/js/widgets/widget_float.js

@@ -32,7 +32,7 b' define(["notebook/js/widgets/widget",'
     WidgetManager.register_widget_view('FloatSliderView', FloatSliderView);
 
 
-    var FloatTextView = IntTextView.extend({    
+    var FloatTextView = IntTextView.extend({
         _parse_value: function(value) {
             // Parse the value stored in a string.
             return  parseFloat(value);

IPython/html/static/notebook/js/widgets/widget_int.js

@@ -16,7 +16,7 b''
 
 define(["notebook/js/widgets/widget"], function(WidgetManager){
 
-    var IntSliderView = IPython.DOMWidgetView.extend({    
+    var IntSliderView = IPython.DOMWidgetView.extend({
         render : function(){
             // Called when view is rendered.
             this.$el
@@ -32,7 +32,7 b' define(["notebook/js/widgets/widget"], function(WidgetManager){'
             // Put the slider in a container 
             this.$slider_container = $('<div />')
                 .addClass('widget-hslider')
-                .append(this.$slider);    
+                .append(this.$slider);
             this.$el_to_style = this.$slider_container; // Set default element to style
             this.$el.append(this.$slider_container);
             
@@ -218,7 +218,7 b' define(["notebook/js/widgets/widget"], function(WidgetManager){'
             }
         },
         
-        handleChanged: function(e) { 
+        handleChanged: function(e) {
             // Applies validated input.
             if (this.model.get('value') != e.target.value) {
                 e.target.value = this.model.get('value');
@@ -233,7 +233,7 b' define(["notebook/js/widgets/widget"], function(WidgetManager){'
     WidgetManager.register_widget_view('IntTextView', IntTextView);
 
 
-    var ProgressView = IPython.DOMWidgetView.extend({    
+    var ProgressView = IPython.DOMWidgetView.extend({
         render : function(){
             // Called when view is rendered.
             this.$el

IPython/html/static/notebook/js/widgets/widget_selection.js

@@ -18,7 +18,7 b' define(["notebook/js/widgets/widget"], function(WidgetManager){'
 
     var DropdownView = IPython.DOMWidgetView.extend({
         render : function(){
-            // Called when view is rendered.            
+            // Called when view is rendered.
             this.$el
                 .addClass('widget-hbox-single');
             this.$label = $('<div />')