title: Filter JSON datasource with Kendo UI
body: <p>I need to populate Kendo drop-down box automatically from the following JSON:</p>
  
  <pre><code>var products=
  [
      {
          id: 1,
          title: "Item-1",
          active: true
      },
      {
          id: 2,
          title: "Item-2",
          active: false
      }
  ];
  </code></pre>
  
  <p>So I use the following code to do this, which works fine:</p>
  
  <pre><code>$("#productList").kendoDropDownList({
      dataSource: products,
      dataTextField: "title",
      dataValueField: "id"
  });
  </code></pre>
  
  <p>The problem is, I want to see only items for which 'active' is true.</p>
  
  <p>How to implement that with Kendo?</p>