jquery获取数据赋值到datagrid复选框

$('#role').datagrid({
title: '角色选择',
rownumbers: true,
width:'200',
height:'300',
columns:[[
{ field : 'ROLE_ID',title : '主键',hidden : true },
{ field:'ck',checkbox:true },
{ field: 'ROLE_DESC', title: '角色' ,width:'100%',height:'100%'}
]],
singleSelect: false,
selectOnCheck: true,
checkOnSelect: true,
onLoadSuccess:function(){
var rows = $("#role").datagrid("getRows");
if(rows){
$.each(rows, function(index, item){
for(var i =0 ; i< chilrenRoleList.length; i++){
if(chilrenRoleList[i].ROLE_ID ==item.ROLE_ID){
$('#role').datagrid('checkRow', index);
}
}
});
}
}
});