HANDLING KEYPRESS EVENT OF TEXTBOX INSIDE GRIDVIEW

I have a GridView, in which my first column is Template Field which contains textbox.

<asp:gridview id="grdTest" runat="server" autogeneratecolumns="false" datakeynames="TestID">

<columns>

<asp:templatefield HeaderText="Amount">

<itemtemplate>

<asp:TextBox ID="txtAmount" runat="server" Text='' />

</itemtemplate>

<asp:boundfield datafield="Name" headertext="Name" />

</asp:TemplateField>

</columns>

</asp:GridView>

Now, I want that user can only enter integer value in txtAmount textbox. I want to handle this client side only. So, I used jquery and handled KeyPress event of textbox. By doing so, user can only enter digits. If user will press any non-numeric key it will not get entered.

<script type="text/javascript">

$(document).ready(function () {

$("#<%=grdTest.ClientID %> INPUT[id$='txtAmount']").keypress(

function IsNumericHandler(e) {

var unicode = e.charCode ? e.charCode : e.keyCode

//if the key isn't the backspace key (which we should allow)

if (unicode != 8) {

//if not a number

if (unicode <> 57)

//disable key press

return false;

}

});

});

</script>