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Date: Wed, 21 Dec 2005 12:49:38 +0100
From: Patrick Refondini <patrick.refondini@pobox.com>
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To: users@cocoon.apache.org
Subject: Re: Forms/Flow: Control Flow Behind form.showForm()
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Sylvain Wallez wrote:
> Patrick Refondini wrote:
> 
>> Thanks, for the quick answer!
>>
>> I looked at the source code available on SVN:
>> http://svn.apache.org/viewcvs.cgi/*checkout*/cocoon/blocks/
>> in
>> forms/trunk/java/org/apache/cocoon/forms/flow/javascript/Form.js
>>
>>
>> Now I am going to reveal my whole Javascript incompetency:
>>
>> The showForm() function located in Form.js has the following signature:
>>
>> Form.prototype.showForm = function(uri, viewdata, ttl) { (...) }
>>
>> Is it the implementation for use case such as:
>>
>> (...)
>> // Load form definition     var form = new Form(formDefinition);
> 
> 
> This calls the Form(...) function which then acts as a constructor.
> 
>> // Send form to client
>> form.showForm("some-pipeline.jx");
>> (...)
>>
>> It is not quite clear yet how Form.prototype.showForm() can be called 
>> Form.prototype.showForm() and how a call to 
>> form.showForm("some-pipeline.jx") is matched something like 
>> form.showForm("some-pipeline.jx", null, null) ?
> 
> 
> Form.prototype.showForm attaches a function to the Form's prototype 
> which is then visible in objects created with "new Form(...)". This is 
> similar to declaring a method on a Java class. Also, JavaScript has no 
> notion of method overloading, but accepts variable argument lists. 
> Unspecified function arguments then have the value "undefined" (a JS 
> keyword).
Thanks for this clarification.

> 
>> Nevertheless I'll need to take a deeper look at this source code and 
>> try to find some Javascript tutorials ;)
> 
> 
> I've you start with JavaScript, using Form.js as a tutorial is probably 
> a bad idea, as it's not the simplest JS you can find and makes an 
> advanced use of continuations to implement the form redisplay loop 
> without actually looping.
I understand...

I try to get a deeper understanding of the showForm() continuation 
"loop" to see when bindings to data are actually applied / reloaded in 
particular in the fb:simple-repeater.

I have implemented a prototype "XML" editor using CForm/Binding/JX 
Templates with ajax enabled. Cocoon does a wonderful job to support this!

My goal is to let a user insert a "Form Fragment" build from a template 
XML file. But I haven't been able to do it yet although I see no reason, 
my Cocoon understanding appart, why it should not be possible.

Patrick

> 
> Sylvain
> 


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