Ext.Ajax

Ext.Ajax.request({
  url: 'Ajax/sampleJson.php',
  // server-side success 
  // (possible application level failure)
  success: function(response, opts) {
    var json = Ext.decode(response.responseText);	
	console.dir(json);
  },
  // server-side failure
  failure: function(response, opts) {

  }
});