Question

I’m starting to learn Backbone with this simple example:

<div id="counter">unkown</div>
<button id="add-button">ADD</button>

(function($){

   var Counter = Backbone.Model.extend({
     defaults: {
        count: 0            
     }
   });

   var CounterView = Backbone.View.extend({
       el: "#counter",

       events: {
            "click #add-button": "add"
       },

       add: function() {
           this.model.count++;
           render();
       },

       render: function() {
           $(this.el).text(this.model.get("count"));
           return this;
       },

       initialize: function(){              
           this.render();
       }
   });

   var counterItem = new Counter();
   var counterView = new CounterView({model: counterItem});              

}(jQuery));  // function($)

So when the “Add” button is pressed the counter should increase and the view should be updates. I have binded the view and the model and have the click event linked with the add function, but somehow this is not working.

So I guess I’m doing something wrong or I’m just missing some binding?

EDIT: Fixed as suggested to this … still not working:

<div class="list">
        <div id="counter">unkown</div>
        <button id="add-button">ADD</button>
</div>  

    (function($){

       var Counter = Backbone.Model.extend({
         defaults: {
            count: 0            
         }
       });

       var CounterView = Backbone.View.extend({
           el: "#counter",

           events: {
                "click #add-button": "add"
           },

           add: function() {
               alert("ADD");
               this.model.set("count", this.model.get("count") + 1);
               this.render();
           },

           render: function() {
               $(this.el).text(this.model.get("count"));
               return this;
           },

           initialize: function(){               
               this.render();
           }
       });

       var counterItem = new Counter();
       var counterView = new CounterView({model: counterItem});                     

    }(jQuery));  // function($)

EDIT: FIXED AND WORKING

<div id="counterHolder">
        <div id="counter">
            <span>unknown</span>
           <button id="add-button">ADD</button>
       </div>
    </div>

    <script>


    (function($){

       var Counter = Backbone.Model.extend({
         defaults: {
            count: 0            
         },

         increase: function(){
             this.set("count", this.get("count") + 1);
         }
       });

       var CounterView = Backbone.View.extend({

           el: "#counter",

           events: {
                "click #add-button": "add"
           },

           add: function() {
               this.model.increase();               
           },

           render: function() {
               $("#counter span").text(this.model.get("count"));
               return this;
           },

           initialize: function(){
               this.render = _.bind(this.render, this); 
               this.render();
               this.model.bind('change:count', this.render);
           }
       });

       var counterItem = new Counter();
       var counterView = new CounterView({model: counterItem});                     

    }(jQuery));  // function($)

    </script>

Answer 1

The button must be a descendant of the view’s el

Update your html like below and it should work

<div id="counter">
  <button id="add-button">ADD</button>
</div>

If you still want to display the count, then add an additional span

<div id="counter">
  <span id="count" />
  <button id="add-button">ADD</button>
</div>

And update your render method

render: function() {
  this.$('#count').text(this.model.get("count"));
  return this;
}