Extjs Exception

Ext.onReady(function(){ // Temporary JSON data - to be replaced by an AJAX call... tempData = '{ \"results\": 2, \"rows\": [{ \"TaskId\": 1, \"TaskName\": \"task 1\"},{ \"TaskId\": 2, \"TaskName\": \"task 2\" } ]}'; var Task = Ext.data.Record.create([ {name: 'TaskName', mapping: 'name'}] ); // create the Data Store var ds = new Ext.data.Store({ proxy: new Ext.data.MemoryProxy(tempData), reader: new Ext.data.JsonReader({ root: 'rows', totalProperty: 'results', id: 'TaskId' }, Task) }); // create grid var grid = new Ext.grid.GridPanel({ ds: ds, width: 500, height: 400, columns: [ {id:'TaskId', header: "ID", width: 200, sortable: true, dataIndex: 'TaskId'}, {header: "Name", width: 120, sortable: true, dataIndex: 'TaskName'} ], el:'example-grid' }); /** * Adding listeners outside the constructor */ ds.on({ 'load':{ fn: function(store, records, options){ console.log('01 - Data Store listener fired (load), arguments:',arguments); console.log(' this:',this); } ,scope:this } ,'loadexception':{ fn: function(httpProxy, dataObject, arguments, exception){ console.log('** - Data Store listener fired (loadexception), arguments:',arguments); } ,scope:this } //add remaining events for education: ,'add':{ fn: function(store, records, index){ console.log('Data Store listener fired (add), arguments:',arguments); } ,scope:this } ,'beforeload':{ fn: function(store, options){ console.log('Data Store listener fired fired (beforeload), arguments:',arguments); } ,scope:this } ,'clear':{ fn: function(store){ console.log('Data Store listener fired fired (clear), arguments:',arguments); } ,scope:this } ,'datachanged':{ fn: function(store){ console.log('11 - Data Store listener fired fired (datachanged), arguments:',arguments); console.log(' If you set a breakpoint here the entire grid will be rendered without data'); console.log(' ...about to "refresh" grid body'); } ,scope:this } ,'remove':{ fn: function(store, record, index){ console.log('Data Store listener fired fired (remove), arguments:',arguments); } ,scope:this } ,'update':{ fn: function(store, record, operation){ console.log('Data Store listener fired fired (update), arguments:',arguments); } ,scope:this } }); // load store ds.load(); // render grid grid.render(); });