SilverStripe 2.4.7

Hi

I am using Dataobjectmanager and am trying to find a way to include validation on the popup. I was rooting through the code and came across this.

parent::__construct($controller, $name, $fields, $actions, $validator);
	    if ($this->validator instanceof Validator) {
        	$this->validator->setJavascriptValidationHandler('none');
		} 
		else {
        	$this->unsetValidator();
      	}

(lines 859-865 of DataObjectManager.php)
I'm confused about what this code is actually doing. I know it is calling the constructor and then checking for an instance of Validator but why is it setting the JavascriptValidationHandler to 'none'?

Thanks

Ok so I've found out how to add a required fields type of validation to DOM popup thanks to this post. What I want to do now is add validation which ensures that a url is in url format and a price is a currency symbol followed by numbers.

Any suggestions? I've been searching online and in the code to no avail.