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From "Ben Pope" <nos...@hotmail.com>
Subject RE: Cforms, Binding & Cross-Referenced data
Date Fri, 30 Jul 2004 00:45:23 GMT
Hi,

I still don't seem to be able to get the binding to work, or understand how
it is supposed to work.  My data now looks like this:

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns:xi="http://www.w3.org/2001/XInclude">
    <people>
        <person id="0">
            <name>Me</name>
        </person>
        <person id="1">
            <name>You</name>
        </person>
        <person id="2">
            <name>Him</name>
        </person>
    </people>
    <rooms>
        <room id="0">
            <name>Lounge</name>
            <xi:include href="#xpointer(/project/people/person[@id=0])"/>
            <xi:include href="#xpointer(/project/people/person[@id=1])"/>
        </room>
        <room id="1">
            <name>Kitchen</name>
            <xi:include href="#xpointer(/project/people/person[@id=2])"/>
        </room>
    </rooms>
</project>

I've modified the XPath in the XPointers so that it points to the id
attribute, rather than the position, which should be more robust!

When you say "Use xinclude (or cinclude) transformer:" I'm not sure if you
mean I should actually parse the above data with it... If so, then the rest
of the example doesn't seem to make sense as I lose the xi:include elements.
E.g., the repeater row-path"xi:include" would fail, so I'll have to assume
that I'm leaving the data as it is, not transforming it.



Right, now, binding:

<fb:context xmlns:fb="http://apache.org/cocoon/forms/1.0#binding"
xmlns:fd="http://apache.org/cocoon/forms/1.0#definition"
xmlns:xi="http://www.w3.org/2001/XInclude" path="/project">
    <fb:value id="roomName" path="rooms/room[@id=0]/name"/>
    <fb:repeater id="people" parent-path="rooms/room[@id=0]"
row-path="xi:include">
        <fb:identity>
            <fb:value id="id" path="@id"> <!-- so I can change it easy for
now -->
                <fd:convertor datatype="long"/>
            </fb:value>
        </fb:identity>
        <fb:on-bind>
            <fb:value id="href" path="@href"/>
            <fb:value id="personName"
path="/project/people/person[@id=$id]/name"/>
        </fb:on-bind>
        <fb:on-insert-row>
            <fb:insert-node>
                <xi:include id="" href=""/>
            </fb:insert-node>
        </fb:on-insert-row>
        <fb:on-delete-row>
            <fb:delete-node/>
        </fb:on-delete-row>
    </fb:repeater>
</fb:context>

The identity won't work, 'cos <xi:include> elements don't have an id
attribute.  Of course... I could give it an idref, but that would seem to be
going back to the way I had it.

My personName doesn't work either, there is obviously no variable named id,
I don't know how to locate the correct element to bind to.  I think this is
the crux of the problem.




My form model looks like this:

<?xml version="1.0"?>
<fd:form xmlns:fd="http://apache.org/cocoon/forms/1.0#definition">
    <fd:widgets>
        <fd:field id="roomName" required="false">
            <fd:label>Room</fd:label>
            <fd:datatype base="string"/>
        </fd:field>
        <fd:repeater id="people">
            <fd:widgets>
                <fd:field id="id">
                    <fd:label>ID</fd:label>
                    <fd:datatype base="long"/>
                </fd:field>
                <fd:output id="href">
                    <fd:label>href</fd:label>
                    <fd:datatype base="string"/>
                </fd:output>
                <fd:field id="personName">
                    <fd:label>Name</fd:label>
                    <fd:datatype base="string"/>
                </fd:field>
                <fd:booleanfield id="select">
                    <fd:label>Select</fd:label>
                </fd:booleanfield>
            </fd:widgets>
        </fd:repeater>
        <fd:repeater-action id="addPerson" repeater="people"
action-command="add-row">
            <fd:label>Add Person</fd:label>
        </fd:repeater-action>
        <fd:repeater-action id="removePeople" repeater="people"
action-command="delete-rows" select="select">
            <fd:label>Remove Selected People</fd:label>
        </fd:repeater-action>
    </fd:widgets>
</fd:form>


I'm still really confused as to how this should work.

If I am supposed to XInclude transform the data, then I can easily modify
the binding to manipulate each room/person, but how do I then create the
xi:include tags, and map the new data back onto the old data?

It would seem to be much better to modify the data "in situ", but I'm not
that fussed as long as it works.

I feel pretty close, but am unsure how to correctly bind the person name in
both directions.

Thanks for all help so far.

Ben







-----Original Message-----
From: Timur Izhbulatov [mailto:tim@yxo.ru] 
Sent: 29 July 2004 12:30
To: users@cocoon.apache.org
Subject: Re: Cforms, Binding & Cross-Referenced data

Ben Pope писал(а): 

> Hi,
> 
> I don't seem to be able to get my head around binding cross-referenced 
> data

I purpose you to try this approach. 

Use xinclude (or cinclude) transformer:
  <rooms>
     <room id="0">
        <name>Lounge</name>
        <xi:include
          href="#xpointer(/project/people/person[2])"/>
        <xi:include
          href="#xpointer(/project/people/person[3])"/>
     </room>
     <room id="1">
         <name>Kitchen</name>
        <xi:include
          href="#xpointer(/project/people/person[1])"/>
     </room>
  </rooms> 

In this case form model may looks like this (don't know if this works):
<fd:form
xmlns:fd="http://apache.org/cocoon/forms/1.0#definition"
xmlns:i18n="http://apache.org/cocoon/i18n/2.1">
<fd:repeater id="people">
    <fd:widgets>
      <fd:output id="id">
        <fd:datatype base="long"/>
      </fd:output>
      <fd:output id="href">
        <fd:datatype base="string"/>
      </fd:output>
      <fd:booleanfield id="select">
        <fd:label>Select</fd:label>
      </fd:booleanfield>
    </fd:widgets>
  </fd:repeater> 

  <fd:repeater-action id="addperson" action-command="add-row"
repeater="contacts">
    <fd:label>Add</fd:label>
  </fd:repeater-action> 

  <fd:repeater-action id="removeperson" action-command="delete-rows"
repeater="contacts" select="select">
    <fd:label>Remove</fd:label>
  </fd:repeater-action>
</fd:widgets>
</fd:form> 

And binding (check if this works):
<fb:context
          xmlns:fb="http://apache.org/cocoon/forms/1.0#binding"
          xmlns:fd="http://apache.org/cocoon/forms/1.0#definition"
          xmlns:xi="http://www.w3.org/2001/XInclude"
          path="/project/rooms/room[1]" > <fb:repeater id="people"
             parent-path="people"
             row-path="xi:include"> 

  <fb:identity>
    <fb:value id="id" path="@id">
      <fd:convertor datatype="long" />
    </fb:value>
  </fb:identity> 

  <fb:on-bind>
      <fb:value id="href" path="@href" />
  </fb:on-bind> 

  <fb:on-delete-row>
    <fb:delete-node />
  </fb:on-delete-row> 

  <fb:on-insert-row>
    <fb:insert-node>
      <xi:xinclude id="" href=""/>
      </contact>
    </fb:insert-node>
  </fb:on-insert-row>
</fb:repeater> 

</fb:context> 

Timur

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