store is undefined - json

Question

I have this problem on ExtJS. I created a grid that display on a window, it will get json data from an external server side script. It is rougly working but the firebug keeps telling me that store is undefined everything I click on the columns in the grid. Can you please help me solve this. Here is my code:
var fields = [{
name: "Name",
type: "text"
}, {
name: "NSId",
type: "number"
}, {
name: "Id",
type: "number"
}, {
name: "Version",
type: "number"
}];
var columns = [{
header: 'Name',
id: 'Name',
width: 160,
sortable: true,
dataIndex: 'Name'
}, {
header: 'NSId',
id: 'NSId',
width: 45,
sortable: true,
hidden: true,
dataIndex: 'NSId'
}, {
header: 'Id',
id: 'Id',
width: 30,
sortable: true,
hidden: true,
dataIndex: 'Id'
}, {
header: 'Version',
id: 'Version',
width: 50,
sortable: true,
hidden: true,
dataIndex: 'Version'
}];
var searchAndPickUrl = OcsConfig.url.refto;
var pickerUrl = '?picker=' + config.picker;
var createRefTo = searchAndPickUrl + pickerUrl;
var jsonstore = {
xtype: 'jsonstore',
autoDestroy: true,
fields: fields,
root: 'candidates',
idProperty: 'Name',
url: createRefTo,
autoLoad: true
};
var cmpGrid = null;
var clickCell = function (trigger) {
var record = cmpGrid.getSelectionModel().getSelected();
var selValues = record.data['name'] + ',' + record.data['nsid'] + ',' + record.data['id'] + ',' + record.data['version'];
Ext.Msg.alert('Name', selValues);
};
var refToGrid = {
id: Ext.id(),
xtype: 'grid',
store: jsonstore,
columns: columns,
stripeRows: true,
defaults: {
anchor: '100%'
},
autoExpandColumn: 'Name',
height: 350,
width: 600,
title: '',
stateful: true,
stateId: 'grid',
listener: {
rowdblclick: clickCell
}
};
var refToWin = function refToInputVal(trigger) {
var values = config.options || [];
var cmpWin = null;
var genId = Ext.id();
var win = null;
if (cmpWin === null) {
win = {
xtype: 'window',
title: config.caption || '',
modal: true,
items: [{
xtype: 'form',
id: genId,
padding: 5,
defaults: {
anchor: '100%'
},
items: [refToGrid]
}],
bbar: [{
xtype: 'button',
text: 'OK',
handler: function () {
returnValue(trigger, cmpGrid);
cmpWin.hide();
}
}, {
xtype: 'button',
text: 'Cancel',
handler: function () {
cmpWin.hide();
}
}],
Thanks.

Answer 1

Change your store declaration...
var jsonstore = new Ext.data.JsonStore({
autoDestroy: true,
fields: fields,
root: 'candidates',
idProperty: 'Name',
url: createRefTo,
autoLoad: true
});