How to set fous to specific row of the extended datatable after reRender

[simonc2009]

Hi,

I got a web page, with extended datatable, a button which add a row in extended datatable.

My problem is to set focus on last added row of the extended datatable after reRendered.

I know we can set focus on field using below code, but it do not works if table is reRendered, and work

again if I add "javascript alert" on below code, why is that and please.

var id ="form1:glSectCodesTable:8:desc";
obj= document.getElementById(id);

//alert("testing");
obj.focus();

Thanks