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From Christopher Oliver <res1c...@verizon.net>
Subject Re: Thoughts on Woody ...
Date Wed, 22 Oct 2003 22:03:29 GMT
Sylvain Wallez wrote:

> Christopher Oliver wrote:
>
>> I think you're making this much more complicated than it needs to be. 
>> Please look at how JXForms does this. First it creates a continuation 
>> immediately before and immediately after a page is sent to the 
>> browser. The latter continuation behaves exactly like 
>> sendPageAndWait(). However, by invoking the former you cause the page 
>> to be resent (and processing to restart when that page is 
>> resubmitted). So:
>>
>> 1) If you invoke the current continuation processing continues after 
>> the current page is submitted.
>> 2) If you invoke its parent continuation the current page is resent 
>> to the browser.
>> 3) If you invoke the grandparent continuation the actions following 
>> submission of the previous page are replayed.
>> 4) If you invoke the great-grandparent continuation the previous page 
>> is resent to the browser.
>>
>> So to implement the "back" button, you invoke (4).
>>
>> The idea is that instead of only encoding the continuation id in the 
>> form or request url, you also associate a "forward" or "back" action 
>> with the submit button. The form submits are _always_ submitted to 
>> the same location, where some Java or JavaScript code looks at the 
>> continuation id together with "forward" or "back" indication of the 
>> submit button. If the indication is "forward" then you simply look up 
>> the continuation associated with the continuation id and invoke it. 
>> But if the indication is "back" then you invoke the great-grandparent 
>> of the continuation.
>
>
>
> I'll look more closely to JXForms. However, does the above behaviour 
> fit with the fact that form.showForm() creates several continuations 
> when iterating until the form is valid? In that case, we cannot just 
> consider restarting at the n-2th or n-3th continuations, since 
> intermediate continuations may have occured inbetween...

Yes it does fit.  An initial continuation is created outside the loop. 
It is reused in each iteration of the loop, becoming the parent of the 
continuation created in each iteration.

>
>> With this approach your example reduces to this (and most importantly 
>> you don't have to explicitly code back/forward navigation in your 
>> flow script):
>>
>> function myWizard() {
>>    var wizard = new Wizard("wizard-spec.xml");
>>    wizard.show("first-page.html");
>>    wizard.show("second-page.html");
>>    wizard.show("third-page.html");
>>    cocoon.sendPage("finished.html");
>> } 
>
>
>
> Mmmh... what I don't like above is that the wizard is sending the 
> pages. How can we with this approach mix form.showForm and 
> cocoon.sendPageAndWait in the same wizard-style interaction?

Why do you need to mix in sendPageAndWait()?



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