radgrid Textbox data remain after postback

[Syed]

Hi,
Iam using Radgrid for ASP.NET project.
In my grid i have 3 textbox column
for Qty,Price and Total Amont as textbox.
Using clientscript i do calculate on Qty*Price textbox value and update the result in Total Amount text box.

upto this its works fine.
but when i click some button ,using Pagin or during postback the new changed value is not displaying.

My code:
in Item data Bound:
 txtQty.Attributes.Add("onFocusout", "return calculate('" + txtQty.ClientID + "','" + txtamnt.ClientID + "','" + txttotamnt.ClientID + "'," + index + ")");
            txtamnt.Attributes.Add("onFocusout", "return calculate('" + txtQty.ClientID + "','" + txtamnt.ClientID + "','" + txttotamnt.ClientID + "'," + index + ")");
            txttotamnt.Attributes.Add("onfocus", "return calculate('" + txtQty.ClientID + "','" + txtamnt.ClientID + "','" + txttotamnt.ClientID + "'," + index + ")");


and my javascript.
 function calculate(cntl1, cntl2, cntl3,rowindex)
           {
                var text1 =$find(cntl1);
                var text2 =$find(cntl2);
                var text3 = $find(cntl3);
               // alert(rowindex);
                var total = text1.get_value() * text2.get_value();
                text3.set_value(total);
                radGrid.MasterTableView.get_dataItems()[rowindex].get_cell("displayAmnt").innerHTML = total;
            }

how to achive textbox Value change value using client side and presist the value.

[Angel Petrov]

Hi Syed,

Actually you can calculate the value on the server in the OnItemDataBound event handler and set it to the Total Amount text box. By following this approach you will avoid attaching client-side event handlers and executing additional logic. The mentioned can be achieved by using the code shown below:

protected void RadGrid1_ItemDataBound(object sender, GridItemEventArgs e)
    {
        GridDataItem item = e.Item as GridDataItem;
        if (item != null)
        {
            int qty = int.Parse((item["QtyColumnName"].FindControl("YourQtyTextBoxID") as TextBox).Text);
            int price = int.Parse((item["PriceColumnName"].FindControl("YourPriceTextBoxID") as TextBox).Text);
            (item["TotalColumnName"].FindControl("TotalColumnTextBoxId") as TextBox).Text= (qty * price).ToString();
        }
    }

Note that you should replace the columns unique names and text boxes ids. If this approach did not prove helpful please show us the columns definitions so we could provide a more accurate answer.

Regards,
Angel Petrov
Telerik