delegateEvents

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小牛编辑

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2023-12-01

描述 (Description)

使用回调方法将元素绑定到指定的DOM元素以处理事件。如果从视图中删除了事件，则可以使用此方法将事件附加到视图。

语法 (Syntax)

delegateEvents(events)

参数 (Parameters)

events - 它提供重新附加到视图所需的事件。

例子 (Example)

<!DOCTYPE html>
<html>
   <head>
      <title>View Example</title>
      <script src = "https://code.jquery.com/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 xnip...");
            },
            //'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>