My ASP Page has a text box[labelled Telephone Number] in which i want that the user should be able to enter ONLY Numeric values. At present any values[text or Numberic] are being entered.
Here is the TextBox:

<td><b>Officer Telephone Number<b></td>
<td><input type="text" id=txtOfficerTelNumber name=txtOfficerTelNumber size = 10 maxlength = 15 value =<%=null%> ></td>

What should i do?

Please help!

Thanks
Ashu

You might like to read up a bit o regular expressions.
I have not done a lot of this but found this article a good explanation.
http://www.4guysfromrolla.com/webtech/090199-1.shtml

It is in two parts, the second gives an example of this based on phone numbers so you're in luck.


======================================
They say, best men are moulded out of faults,
And, for the most, become much more the better
For being a little bad.
======================================

On the server you could use
IsNumeric(variable)
This function retuens a Boolean variable
For the convenience of the user you can use the javascript method isNan(variable), mind that this one returns true if the variable is Not a Number

Regards,

Gerhard Wentink

Gerhard Wentink

Thanks for the sol!

Dear Gerhard

can you send me a code sample showing how to call this function isNaN()? I mean when should i call it and from where?

thanks
ashu

Given a form with a textbox named "invoiceNumber".
You can call the function below in the onsubmit-event: onsubmit="return validate()"

function validate(){
    if (isNaN(document.forms[0].invoiceNumber.value))
    {
        alert('An invoice number only contains numbers');
        document.forms[0].invoiceNumber.focus();
        return (false);
}

Regards,

Gerhard Wentink

thanks for the code!

thanks for the code!

regards
ashu