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Text box to accept only number

, 23 Apr 2011 CPOL
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Text box to accept only number
   <SCRIPT language="Javascript">
      function isNumberKey(evt)
         var charCode = (evt.which) ? evt.which : event.keyCode
         if (charCode > 31 && (charCode < 48 || charCode > 57))
            return false;
         return true;
      <INPUT id="txtChar" onkeypress="return isNumberKey(event)" type="text" name="txtChar">

Just paste the Script Section in the Head section and in on key press call the function.
For C#, just paste the following code:

function allownumbers(e) {
        var key = window.event ? e.keyCode : e.which;
        var keychar = String.fromCharCode(key);
        var reg = new RegExp("[0-9.]")
        if (key == 8) {
            keychar = String.fromCharCode(key);

And in PageLoad:
txtNum.Attributes.Add("onkeypress", "javascript:return allownumbers(event);");


This article, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)


About the Author

Software Developer India
India India
Total DotNet/Programming Solution

I am Prasanta Banerjee. I am an Asp.Net Developer. My site:
If any body wants to prepare for interview is the good site.

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Comments and Discussions

GeneralRe: Negative values you just have to program to allow the minus ... Pin
EdMan19624-Apr-11 3:08
memberEdMan19624-Apr-11 3:08 

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