datastore load error"root is undefined"

[netbox]

mycode

 var DepartMentDs = new Ext.data.Store(
        {
            proxy: new Ext.data.WCFHttpProxy({
                url: "/OA_Service.svc/GetDepartMentList"
            }),
            reader: new Ext.data.WCFJsonReader({
                root: 'DepartMentList',
                totalProperty: 'TotalCount',
                id: 'DeptID',
                fields: [
			{name:'DeptID',type:'int'},
			{name:'DeptName',type:'string'},
			{name:'DeptParent',type:'int'},
			{name:'DeptOrder',type:'int'},
			{name:'DeptLevel',type:'int'},
			{name:'DeptBelong',type:'int'}
                ]
            }),
            remoteSort: true
        }
        );
        DepartMentDs.setDefaultSort("DeptID", "asc");

  var cm = new Ext.grid.ColumnModel([
        rn,
        sm,
		{header:'',dataIndex:'DeptID'},
		{header:'部门名称',dataIndex:'DeptName'},
		{header:'上级部门',dataIndex:'DeptParent'},
		{header:'排序',dataIndex:'DeptOrder'},
		{header:'层级',dataIndex:'DeptLevel'},
		{header:'部门所属',dataIndex:'DeptBelong'},


    ]);
                cm.defaultSortable = true;
                var grid = new Ext.grid.GridPanel({
                    ds: DepartMentDs,
                    cm: cm,
                    sm: sm,
                    title: '通告列表',
                    bbar: new Ext.PagingToolbar({
                        pageSize: 10,
                        store: DepartMentDs,
                        displayInfo: true,
                        displayMsg: '显示第 {0} 条到 {1} 条记录，一共 {2} 条',
                        emptyMsg: "没有记录"
                    }),
                    tbar: [{
                        id: 'btnAdd',
                        text: '新增',
                        tooltip: '新增',
                        iconCls: 'add',
                        handler: showAddPanel
                    }, '-', {
                        text: '修改',
                        tooltip: '修改',
                        iconCls: 'edit',
                        handler: showEditPanel
                    }, '-', {
                        text: '批量删除',
                        tooltip: '删除',
                        iconCls: 'remove',
                        handler: showDelDialog
}]
                    });
                    this.body = grid;

 DepartMentDs.load({ params: { start: 0, limit: 20} });

response by firefox

{"GetDepartmentListResult":"{\"TotalCount\":\"136\",\"DepartmentList\":[{\"DeptID\":37,\"DeptName\":

\"设计院\",\"DeptParent\":36,\"DeptOrder\":null,\"DeptLevel\":null,\"DeptBelong\":null},{\"DeptID\":32,

\"DeptName\":\"办领导\",\"DeptParent\":31,\"DeptOrder\":null,\"DeptLevel\":null,\"DeptBelong\":null},{\"DeptID

\":64,\"DeptName\":\"办领导\",\"DeptParent\":50,\"DeptOrder\":null,\"DeptLevel\":null,\"DeptBelong\":null

},{\"DeptID\":79,\"DeptName\":\"机关党委\",\"DeptParent\":31,\"DeptOrder\":null,\"DeptLevel\":null,\"DeptBelong

\":null},{\"DeptID\":80,\"DeptName\":\"政秘科\",\"DeptParent\":31,\"DeptOrder\":null,\"DeptLevel\":null

,\"DeptBelong\":null},{\"DeptID\":81,\"DeptName\":\"指通科\",\"DeptParent\":31,\"DeptOrder\":null,\"DeptLevel

\":null,\"DeptBelong\":null},{\"DeptID\":82,\"DeptName\":\"工程科\",\"DeptParent\":31,\"DeptOrder\":null

,\"DeptLevel\":null,\"DeptBelong\":null},{\"DeptID\":83,\"DeptName\":\"财务科\",\"DeptParent\":31,\"DeptOrder

\":null,\"DeptLevel\":null,\"DeptBelong\":null},{\"DeptID\":84,\"DeptName\":\"法制科\",\"DeptParent\":31

,\"DeptOrder\":null,\"DeptLevel\":null,\"DeptBelong\":null},{\"DeptID\":85,\"DeptName\":\"指管处\",\"DeptParent

\":31,\"DeptOrder\":null,\"DeptLevel\":null,\"DeptBelong\":null},{\"DeptID\":86,\"DeptName\":\"平管处\"

,\"DeptParent\":31,\"DeptOrder\":null,\"DeptLevel\":null,\"DeptBelong\":null},{\"DeptID\":87,\"DeptName

\":\"重管处\",\"DeptParent\":31,\"DeptOrder\":null,\"DeptLevel\":null,\"DeptBelong\":null},{\"DeptID\":88

,\"DeptName\":\"通信站\",\"DeptParent\":31,\"DeptOrder\":null,\"DeptLevel\":null,\"DeptBelong\":null},{

\"DeptID\":89,\"DeptName\":\"质监站\",\"DeptParent\":31,\"DeptOrder\":null,\"DeptLevel\":null,\"DeptBelong

\":null},{\"DeptID\":151,\"DeptName\":\"办领导\",\"DeptParent\":150,\"DeptOrder\":null,\"DeptLevel\":null

,\"DeptBelong\":null},{\"DeptID\":152,\"DeptName\":\"定额站\",\"DeptParent\":36,\"DeptOrder\":null,\"DeptLevel

\":null,\"DeptBelong\":null},{\"DeptID\":153,\"DeptName\":\"审图中心\",\"DeptParent\":36,\"DeptOrder\":null

,\"DeptLevel\":null,\"DeptBelong\":null},{\"DeptID\":154,\"DeptName\":\"质检站\",\"DeptParent\":36,\"DeptOrder

\":null,\"DeptLevel\":null,\"DeptBelong\":null},{\"DeptID\":174,\"DeptName\":\"办领导\",\"DeptParent\":171

,\"DeptOrder\":null,\"DeptLevel\":null,\"DeptBelong\":null},{\"DeptID\":176,\"DeptName\":\"所领导\",\"DeptParent

\":36,\"DeptOrder\":null,\"DeptLevel\":null,\"DeptBelong\":null}]}"}

grid is empty and firebug show

"root is undefined" at
11936" var root = this.getRoot(o), c = root.length, totalRecords = c, success = true;"
here "o" has values

[shibubh]

JSON response is wrong.

{"GetDepartmentListResult":"{\"TotalCount\":\"136\",\"DepartmentList\":[{\"DeptID\":37,\"DeptName\":

\"设计院\",\"DeptParent\":36,\"DeptOrder\":null,\"DeptLevel\":null,\"DeptBelong\":null},{\"DeptID\":32,

\"DeptName\":\"办领导\",\"D

'\' remove this

[netbox]

JSON response is wrong.

'\' remove this

but json string

{"GetContactsListResult":"{\"TotalCount\":\"6\",\"ContactsList\":[{\"ContactID\":1,\"ContactType\":\"22

\",\"ContactName\":\"\",\"ContactClass\":\"111\"},{\"ContactID\":2,\"ContactType\":\"私有\",\"ContactName

\":\"fsdf\",\"ContactClass\":\"111\"},{\"ContactID\":3,\"ContactType\":\"公有\",\"ContactName\":\"dasd

\",\"ContactClass\":\"111\"},{\"ContactID\":4,\"ContactType\":\"私有\",\"ContactName\":\"\",\"ContactClass

\":\"111\"},{\"ContactID\":5,\"ContactType\":\"私有\",\"ContactName\":\"\",\"ContactClass\":\"111\"},{

\"ContactID\":6,\"ContactType\":\"dfs\",\"ContactName\":\"ff\",\"ContactClass\":\"222\"}]}"}

work fine at another grid, and total 10 grid only department grid show this error. mycode is generate by codesmith,json string is from WCF,my wcfjsonreader

/**   
* @class Ext.data.WCFJsonReader  
* @extends Ext.data.JsonReader 
* 
* Custom reader for reading data from WCF.  If you are using WebMessageBodyStyle.Wrapped, then WCF adds a root object to your   
* JSON result: 
*    
* { "MethodResult": { "Count" : 0, "Objects": [ … ] } }   
*  
* Ext does not expect the result to have a root object before parsing, so this class will remove it.    
*/
Ext.data.WCFJsonReader = Ext.extend(Ext.data.JsonReader, {
    /* @cfg {Boolean} Sets whether or not the OperationContract has the is using WebMessageBodyStyle.Wrapped */
    wrapped: true,
    /**  
    * If wrapped is set to true, we will strip WCF’s wrap object    
    */
    read: function(response) {
        var json = response.responseText;
        var o = eval("(" + json + ")");
        if (!o) {
            throw { message: "JsonReader.read: Json object not found" };
        }
        if (this.wrapped) {
            for (var prop in o) {
                if (typeof (prop) == 'string' && prop.substr(prop.length - 6, prop.length) == 'Result') {
                    o = this.convert(o[prop]);
                    //o = o[prop]; 
                    break;
                }
            }
        }
        if (o.metaData) {
            delete this.ef;
            this.meta = o.metaData;
            this.recordType = Ext.data.Record.create(o.metaData.fields);
            this.onMetaChange(this.meta, this.recordType, o);
        }
        return Ext.data.WCFJsonReader.superclass.readRecords.call(this, o);
    },
    //private   
    convert: function(o) {
        o = eval("(" + o + ")");
        var newResult = new Object();
        for (var rootProp in o) {
            newResult[rootProp] = o[rootProp];
        }
        return newResult;
    }
});

[netbox]

code

DepartMentDs.load({ params: { start: 0, pagesize: 2} });

json string

{"GetDepartmentListResult":"{\"TotalCount\":\"136\",\"DepartmentList\":[{\"DeptID\":32,\"DeptName\":

\"办领导\",\"DeptParent\":31,\"DeptOrder\":null,\"DeptLevel\":null,\"DeptBelong\":null},{\"DeptID\":37,

\"DeptName\":\"设计院\",\"DeptParent\":36,\"DeptOrder\":null,\"DeptLevel\":null,\"DeptBelong\":null}]}"

}
attachments "111.jpg" is firebug print screen

[Animal]

root: 'DepartMentList',

So, does your object have a property called "departMentList"?

[netbox]

thank you very much：）