Text box to accept only number

<HTML>
   <HEAD>
   <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;
      }
      
   </SCRIPT>
   </HEAD>
   <BODY>
      <INPUT id="txtChar" onkeypress="return isNumberKey(event)" type="text" name="txtChar">
   </BODY>
</HTML>

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) {
            //alert(key);
            keychar = String.fromCharCode(key);
        }

And in PageLoad:

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

License

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

About the Author

Prasanta_Prince

Software Developer India

India

Member

http://devcorners.com/
Total DotNet/Programming Solution

I am Prasanta Banerjee. I am an Asp.Net Developer. My site: http://devcorners.com/
Email: prasanta.it@hotmail.com
If any body wants to prepare for interview http://guru-code.blogspot.com/ is the good site.

Article Top

Poor

Excellent

Add a reason or comment to your vote: x
Votes of 3 or less require a comment

		9,886,267 members (33,920 online) Visit CodeProject.TV Discuss CodeProject.TV Sign in Email Password Forgot your password? Sign in using

Text box to accept only number

License

About the Author

Comments and Discussions