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From Andreas Hochsteger <e9625...@student.tuwien.ac.at>
Subject Re: Event handling in Woody
Date Sun, 28 Sep 2003 19:41:15 GMT
Sylvain Wallez wrote:

> Andreas Hochsteger wrote:
> 
>> Hi Sylvain!
>>
>> Sylvain Wallez wrote:
>>
>>> <snip/>
>>>
>>> I solved points 3&4 as follows :
>>> - <wd:action> are considered as "intra-form" actions : they never 
>>> validate and always redisplay the form
>>> - <wd:submit> (new widget that extends action) are considered as 
>>> "form-exit" actions. They have an additional "validate" attribute 
>>> that define if form validation should occur (true by default). For 
>>> example, this allows a "cancel" button to be written as <wd:submit 
>>> id="cancel" validate="false"/>
>>
>>
>>
>> Would it be possible (perhaps in the future) to handle those 
>> intra-form actions completely on the client (eg. via JavaScript)?
>> Imagine using some DHTML to add or delete rows...
>>
>> Not that I'd need it right now, but I'm just curious, if you thought 
>> about something like that.
> 
> 
> 
> Yes, I thought about that, and I even wrote some add/remove stuff for 
> XMLForm before switching to Woody. But this can be very tricky to do as 
> it highly depends on how the form widgets map to HTML code.
 >
> And since this mapping is defined by the form template, you can't rely 
> on the fact that a repeater is laid out in a particular way. This could 
> be done, however, if the layout of a repeater was templated using a new 
> instance-only widget like the wi:group defined in "woody-page-styling.xsl".
> 
> Now the repeaters are only a small part of event-handling, as actions 
> can be used to do many other things such as getting the (parsed and 
> validated) value of other fields, accessing application data, etc. This 
> server-side event handling allow to simply define complex form 
> interactions at the cost of a roundtrip to the server. I'm currenlty 
> investingating in moving form styling on XSL-enabled clients (Mozilla 
> and IE6) which would speed up this rountripping.
> 
> Now handlers involving widgets only (and not app-data) may be sent to 
> the client, but this would require to reconsitute an equivalent of the 
> form model on the client. Not easy, but I'm not a client-side JS 
> expert... Want to give it a try ?

I'm not either ... :-(

One more question comes to my mind:
How hard would it be to support XUL applications with Woody?

> Sylvain
> 

Andreas



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