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From Sylvain Wallez <>
Subject Re: [CForms] URL Validator
Date Wed, 08 Jun 2005 17:12:32 GMT
Ugo Cei wrote:

> I'm in need of a simple URL validator for CForms. It should test 
> whether a string value represents a well-formed URL and if it doesn't, 
> prepend "http://" and try again.
> I think this would nicely cover the use case where you need to specify 
> a website address in a form but don't want to force users to specify 
> the protocol.
> Has anybody come up with something similar before?
> Also, I would like the field value to be a well-formed URL in any 
> case, so it should always contain a protocol part. Is it allowed for a 
> validator to change the value of its widget?

Hmm... not good as the validation expects the form to be in a stable 
state throughout the whole validation phase. We should even add checks 
to ensure widgets don't change within the validation phase :-)

> Would it be better instead to define a new "url" datatype and 
> corresponding convertor? It looks cleaner, but it also seems overkill 
> to define a validator, a datatype and a convertor (plus factory 
> classes) just to cover this simple use case.
>     WDYT?

What about a simple value-changed listener that adds the protocol when 
it's not there? It will be called before the validator, which can then 
check the absolute URL with its protocol.


Sylvain Wallez                        Anyware Technologies  
Apache Software Foundation Member     Research & Technology Director

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