BackboneJS - Ver delegateEvents

Descripción

Vincula elementos a los elementos DOM especificados con métodos de devolución de llamada para manejar eventos. Si los eventos se eliminan de la vista, este método se puede utilizar para adjuntar los eventos a la vista.

Sintaxis

delegateEvents(events)

Parámetros

events - Proporciona eventos necesarios para volver a adjuntar a la vista.

Ejemplo

<!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 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>

Salida

Realicemos los siguientes pasos para ver cómo funciona el código anterior:

Guarde el código anterior en el delegateevents.htm archivo.
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