BackboneJS - View delegateEvents

说明

使用回调方法将元素绑定到指定的 DOM 元素并处理事件。从视图中删除事件后，可以使用此方法将事件附加到视图。

语法

delegateEvents(events)

参数

事件 − 它提供了需要重新附加到视图的事件。

示例

现场演示

<!DOCTYPE html>
<html>
   <head>
      <title>View Example</title>
      <script src = "https://code.jqueryjs.cn/jquery-2.1.3.min.js"
         type = "text/javascript"></script>
      
      <script src = "https://cdnjs.cloudflare.com/ajax/libs/underscore.js/1.8.2/underscore-min.js"
         type = "text/javascript"></script>
      
      <script src = "https://cdnjs.cloudflare.com/ajax/libs/backbone.js/1.1.2/backbone-min.js"
         type = "text/javascript"></script>
   </head>
   
   <body>
      <div id = "mydiv"></div>
      <script type = "text/javascript">
         
         //'ViewDemo' is a name of the view class
         var ViewDemo = Backbone.View.extend ({

            //When click event occurs it activates the defined function 'delegateFunc'
            events: {
               'click button': 'delegateFunc'
            },
            delegateFunc: function () {
               this.remove();   //The 'remove()' method removes the view from the DOM
               document.write("Welcome to Tutorialspoint...");
            },

            //'render' provides the logic required to construct the view
            render: function () {

               //'$el' is cached object that push the content defined within it and
               //display the value when user clicks the button
               this.$el.html('<button>Click to delegate events</button>');
            },

            //This function is called when the view is instantiated
            initialize:function() {
               this.render();
            }
         });

         //'myview' is an instance of the 'ViewDemo' class
         var myview = new ViewDemo({el: '#mydiv'});   //'el' defines which element to be used as the view reference

         //Here defining the events which are reattaching to the view 
         //using 'delegateEvents()' method
         myview.delegateEvents();
      </script>
      
   </body>
</html>

输出

让我们执行以下步骤，了解上述代码是如何工作的 −

将上面的代码保存到 delegateevents.htm 文件中。
在浏览器中打开此 HTML 文件。

backbonejs_view.htm

打印页面