Understanding data structure for treegrid

[zolotoy]

Can you explain different hierarchical  data structures for a treegrid? What I understand is that basically we can use either an xml or a json format. With an xml we have to to do some client side processing. We have to create an object with two properties: total, and an array: rows. Two fields idfield and _parentId are used to show a hierarchy. Now, with json examples I dont see any client side data processing before showing it. But how does it know the hierarchy? Seems like a json data needs to be fully prepared in order to show hierarchy? Is that correct?

Thanks

[thecyberzone]

Please refer to the example is the following link http://www.jeasyui.com/tutorial/tree/treegrid3.php and you will find enclosed a sql dump of the table used to hold tree data, where you can easily find how id and parentId is used in treegrid3demo_getdata.php code to form tree dynamically.

[zolotoy]

Are you sure you are answering my question?