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disable alpha caracters in ASP.NET textbox

Chris Jones
Chris Jones asked
on
Medium Priority
291 Views
Last Modified: 2012-05-06
is there any way i can prevent from any alpha car from being entered
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You would use javascript.  This will only allow numbers to be entered.

If you want, you can add the attribute in the form_load function

textbox1.attributes.add("onkeypress","return isNumberKey(event)")
<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>
 
<asp:TextBox id="textbox1" runat="server" onkeypress="return isNumberKey(event)" />

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Chris JonesLead Application Web Developer

Author

Commented:
it tells me onkeypress is not a valid attrabute?
Top Expert 2009

Commented:
It's not, but it should still work... if not you can add it during runtime in the Page_Load

<asp:TextBox id="textbox1" runat="server"  />

Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load
    textbox1.Attributes.Add("onkeypress","return isNumberKey(event)")
Chris JonesLead Application Web Developer

Author

Commented:
ok this works thans

aibusinesssolutions:
Chris JonesLead Application Web Developer

Author

Commented:
Thanks for the fast reply
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