试试这个:
HTML:

Hi,
Try this:
HTML:

<asp:TextBox ID="txtUID" runat="server" CssClass="TextBox" onkeypress="return onlyNumbers(this);"/>

JAVASCRIPT:

JAVASCRIPT:

//Restrict the user to key-in chrectors and other special charectors
function onlyNumbers(evt) {
    var e = event || evt; // for trans-browser compatibility
    var charCode = e.which || e.keyCode;
    if (charCode > 31 && (charCode < 48 || charCode > 57))
        return false;
    return true;
}

如果用户需要键入该字段，也可以使用RequiredFieldValidator.



--Amit

And also use RequiredFieldValidator if the field is required to key-in by user.



--Amit

假定这不是一个Web应用程序，因为如果是这样，则您应该这样说，处理文本框的keypress或keydown事件，然后调用一个方法检查Char.IsDigit和Char.IsControl并将Handled = true设置为拒绝按键.如果这是一个Web应用程序问题，请正确标记您的问题.

Assuming this is not a web app, because if it was, you''d have said so, handle the keypress or keydown event for your textbox, and call a method that checks Char.IsDigit and Char.IsControl and set Handled = true so that the keypress is rejected. If this is a web app question, tag your questions properly.

看看RequiredFieldValidator ^ ].

本文 [

Have a look at the RequiredFieldValidator[^].

This article[^] should also give you some updates.