will there be onkeypress event for textbox in asp.net for calling javascript function

Question

I want to implement onkeypress event for a textbox in asp.net to call a javascript function that validates textbox for number field. How can i validate a textbox in asp.net for number field using javascript function but that javascript function is not calling. This is my javascript function

function FDigit(x)
{
if (x.KeyCode < 48 || x.KeyCode > 57)
{
    alert("Enter Digits only");
    return false;
}

this is my textbox control from where i have called for onkeypress event.

<td><asp:TextBox ID="txtSalary" runat="server" OnKeyPress="return FDigit(x)"></asp:TextBox>

Possible duplicate of How to call function from text input key press in javascript? — devlin carnate
– devlin carnate, Commented Apr 12, 2016 at 15:32

Martin Parenteau · Accepted Answer · 2016-04-12 21:26:15Z

1

You can pass eventto to your function rather than x:

<asp:TextBox ID="txtSalary" runat="server" onkeypress="return FDigit(event);" />

In the function, use keyCode instead of KeyCode:

function FDigit(evt) {
    if (evt.keyCode < 48 || evt.keyCode > 57) {
        alert("Enter Digits only!");
        return false;
    }
}

edited Apr 12, 2016 at 21:26

answered Apr 12, 2016 at 15:28

Martin Parenteau

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