disable form submit button unless a form field value is changed

[John <jo...@quivinco.com>]

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.

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

regards,
John

Re: disable form submit button unless a form field value is changed

[Thiago H de Paula Figueiredo <th...@gmail.com>]

On Fri, 24 May 2013 08:00:25 -0300, John <jo...@quivinco.com> wrote:

> Hi,

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  
client-side.

> 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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