防止用户在ASP.NET文本框中输入非数字数据 [英] prevent user from enter non-numeric data in ASP.NET textboxes

问题描述

我正在使用VS2010/C#进行ASP.NET Web项目，我有一些文本框，用户只能在其中输入数字，如何防止用户输入非数字，浮点数和负数在我的文本框中?当然，我可以检查服务器端代码中输入的数字，但是我认为将数据发送到服务器并执行验证将花费大量时间，有没有办法防止用户输入非数字值?还是至少不将数据发送到服务器的数据不正确?

I'm working on an ASP.NET web project using VS2010/C#, I have some text boxes which users should enter only numbers in them, how can I prevent users from entering non-numeric, floating point numbers and negative numbers in my text boxes? of course I can check entered numbers in server side code, but I think sending data to server and performing validation will take a huge amount of time, is there a way to prevent users from entering non-numeric values? or at least not sending data to server with incorrect data?

谢谢

推荐答案

仅使用一些javascript并将其应用于所需的文本框，然后它将不允许除数字以外的其他文本框，请参见以下代码部分.

Simply use some javascript and apply to the text box required, then it will not allow the others except numbers, see the following code part.

 <script language="JavaScript">
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;

}
</script>

<asp:textbox id="txtNOD" runat="server" Width="52px" Font-Size="10px" 
 Font-Names="Verdana" Height="16px" Enabled="False" onkeypress="return onlyNumbers();"></asp:textbox>

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