Sencha Touch JSONPReader - sencha-touch

Question

Using sencha touch 2, am trying to render a nestedlist with json proxy.
The json looks like
[
{
"start": "0"
},
{
"format": "json"
},
.......
{
"GetFolderListing": [
{
"folder": {
"total": 0,
"id": "Calendar",
"name": "Calendar",
"unread": 0,
}
},
{
"folder": {
"total": 0,
"id": "Contacts",
"name": "Contacts",
"unread": 0,
}
},
.......
I want to use GetFolderListing.folder.name as the displayField
My store looks like
Ext.define('foo.store.FolderListing', {
extend: 'Ext.data.TreeStore',
require: ['foo.model.FolderListing'],
config: {
model: 'foo.model.FolderListing',
recursive: true,
proxy: {
type: 'jsonp',
url: 'http://localhost/?xx=yy&format=json',
callbackKey: "jsoncallback",
reader: {
type: 'json',
rootProperty: 'GetFolderListing',
record: 'folder'
}
}
}
});
Right now all i get is an error
Uncaught TypeError: Cannot read property 'id' of undefined
Could anyone provide insight on how to solve this or debug it better or how to do custom parsing and pass items back to a store?
Thanks
========
Update - in order for the rootProperty to work in the reader, the json had to be a jsonobject rather than a json array e.g.
{
"GetFolderListing": [
{
"folder": {
"total": 0,
"id": "Contacts",
"name": "Contacts",
"unread": 0,
"leaf": "true"
}
},
{
"folder": {
"total": 0,
"id": "Conversation Action Settings",
"name": "Conversation Action Settings",
"unread": 0,
"leaf": "true"
}
},
.......

Answer 1

Your JSON looks like an array. The error message means that the code tries to access a property of a undefined variable or property.
My first guess would be that the reader is not properly configured for that array type JSON format.