How do I implement a update and delete button for the Struts2JQuery grid in Javascript??

For Add(Insert) the javascript will look like this

$.subscribe('additem', function(event,data) {
    $("#gridedittable").jqGrid('editGridRow',"new",{height:280,reloadAfterSubmit:true});
    });

as shown in the Demo

I want to work exactly the same as the navigation update and delete in the grid.

Thanks.

Regards,

Jimmy