EmberJS-Router Asynchronously Loading Models

Quiz

Description

It returns a promise from the model hook before rendering the template and getJSON() method returns a promise for JSON. Ember.Js uses the promise object that helps render the data continually.

Syntax

Ember.Route.extend({
   model: function() {
      return Ember.$.getJSON('filename');
   }
});

Example

<!DOCTYPE html>
<html>
   <head>
      <title>Emberjs Asynchronously Loading Models</title>
      <!-- CDN's -->
      <script src="https://cdnjs.cloudflare.com/ajax/libs/handlebars.js/3.0.1/handlebars.min.js"></script>
      <script src="https://code.jquery.com/jquery-2.1.3.min.js"></script>
      <script src="https://cdnjs.cloudflare.com/ajax/libs/ember.js/1.10.0/ember.min.js"></script>
      <script src="https://builds.emberjs.com/tags/v1.10.0-beta.3/ember-template-compiler.js"></script>
      <script src="https://builds.emberjs.com/release/ember.debug.js"></script>
      <script src="https://builds.emberjs.com/beta/ember-data.js"></script>
   </head>
   <body>
      <script type="text/x-handlebars">
         {{outlet}}
      </script>

      <script type="text/x-handlebars" data-template-name="index">
         <!-- loop over the JSON data -->
         <h1>JSON file of the specified url:</h1>
         {{#each pr in model}}
            <p><b>Created at</b>: {{pr.created_at}}</p>
            <p><b>Title</b>: {{pr.title}}</p>
         {{/each}}
      </script>

      <script type="text/javascript">
         App = Ember.Application.create();

         App.IndexRoute = Ember.Route.extend({
            model: function() {
               var url = 'https://api.github.com/repos/emberjs/ember.js/pulls';
               //get the JSON values from the specified url
               return Ember.$.getJSON(url).then(function(data) {
                  //adds the data to/from an array. splice(0,2) is the number of items to be displayed: is 2
                  return data.splice(0, 2);
               });
            }
         });
      </script>
   </body>
</html>

Output

Let's carry out the following steps to see how above code works:

Save above code in routing_async_mod.htm file
Open this HTML file in a browser.

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