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Reply posted by Jake Howlett on Wed 1 May 2002 in response to Form Validator R2.0

What's the chances of that...

Only today I wrote a few lines to validate a time field (something I'd never
done before).


I used a different approach and for a field where there was no AM/PM but was in
24 hr format and didn't require leading 0.


I added a method called "checkTimeFormat()" to the prototype object of all
Strings like so:
[<pre class="JavaScript">]String.prototype.checkTimeFormat = function ( ){
return /^[0-2]?\d:[0-5]{1}\d/.test( this );
}[</pre>]
A call to which looks like:
[<pre class="JavaScript">]frm = document.forms[0];
if( !frm.TimeField.value.checkTimeFormat() ){
alert('Dodgy time!')
}[</pre>]
Just thought I'd share it with you. As you have so kindly done. Cheers


Jake
PS: As your script stands I could get away with entering 39:99 PM !
PPS: If you pass the field's object to the function there is no need for:


var textTime = document.myForm.elements[timeV.name].value;


as you can just use:


var textTime = timeV.value;


PPPS: Instead of checking for AM and am you can use toLowerCase() and then it's:


var valresult = textTime.toLowerCase().match(timeExpression);