getGridField("clientGrid", 1, "txtData").value = "0";
echo 'dddddddd';

$item = @@item;
$amount = @@amount;
$vendor = @@vendor;

@=grid_item = array(
     1 => array('item'=>$item,  'amount'=>$amount, 'vendor' => $vendor)
);

var item= $("#item").getValue();
var amount= $("#amount").getValue();
var vendor = $("#amount").getValue();

//inserting value in the grid
//jQuery("#grid").setValue(value, row, col); syntax
jQuery("#grid_item").setValue(item, '1', '1');
jQuery("#grid_item").setValue(amount, '1', '2');
jQuery("#grid_item").setValue(vendor, '1', '3');