Ext.Grid 刷新后选中指定行

var orderId = Ext.getCmp('gridId').getSelectionModel().getSelected().get('order_id');
var lastOptions = Ext.getCmp(trigger).getStore().lastOptions;
Ext.getCmp('gridId').getStore().reload({params:lastOptions.params, callback:function(r,scope,success){
if(success)
{
var orderStore = Ext.getCmp('gridId').getStore();
var rowCount = orderStore.getCount();
for(var i=0;i<rowCount;i++)
{
if(orderStore.getAt(i).get("order_id") == orderId)
{
//选中默认行
Ext.getCmp('gridId').getSelectionModel().selectRow(i,true);
return;
}
}
}
}
});