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From "Thiago H de Paula Figueiredo" <thiag...@gmail.com>
Subject Re: disable form submit button unless a form field value is changed
Date Fri, 24 May 2013 11:34:26 GMT
On Fri, 24 May 2013 08:00:25 -0300, John <john@quivinco.com> wrote:

> Hi,


> Is there an easy way for a form submit button to be disabled until the  
> user edits a field and makes it different from it's initial value when  
> the form rendered? Also if the user puts the field back to original  
> value the submit again disables.

None out-of-the-box in Tapestry. This needs to be implemented 100%  
implemented in JavaScript, as the values you need to track changes are all  

> I seem to remember Tapestry secures forms with some kind of signature,  
> could that be used?

Nope, as what you want is 100% client-side and this signature (HMAC) is to  
avoid security problems.

Thiago H. de Paula Figueiredo

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