generating unique ids for XForms elements using xxforms:variable and xi:include

Erik Bruchez wrote

Philip,

The error is not very clear but what it means is that you have a  
duplicate variable declaration. You cannot override variable this way,  
unfortunately, anymore than you can do it in Java or other languages.

Now I haven't tried this, but what if you were putting an xforms:group  
around each variable, like:

<xforms:group>
   <xxforms:variable name="citeinforepeat">1</xxforms:variable>
   <xi:include href="/apps/xforms-stacy/citeinfo.xhtml" />
</xforms:group>

-Erik

On Jun 8, 2009, at 9:12 AM, Philip.Cantin wrote:

>
> Hi All,
>
> I am trying to create unique ids for an XHTML document that I am  
> importing
> using an <xi:include> tag.
>
> My approach initially was to use an xxforms:variable for each id in  
> the
> imported document, and then set it to a different value in-between the
> xi:includes.
>
> However, for some reason my variable is not recognized....instead, I  
> get a
> "Duplicate id for XForms element: $citeinforepeat" error.
>
>
> Is there something I'm not taking into consideration? And if my  
> approach
> isn't a good one, what is the best way to accomplish this? The files  
> I am
> using are attached below.
>
> Thanks in advance!!
>
>
> ---Philip
>
>
> http://www.nabble.com/file/p23927142/test_uniqueids.xhtml
> test_uniqueids.xhtml
>
> http://www.nabble.com/file/p23927142/citeinfo.xhtml citeinfo.xhtml
> --
> View this message in context: http://www.nabble.com/generating-unique-ids-for-XForms-elements-using-xxforms%3Avariable-and-xi%3Ainclude-tp23927142p23927142.html
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>
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Philip.Cantin wrote

It looks to me as if, in citeinfo.xhtml, the $citeinforepeat variable isn't even being recognized within the id attribute of <xf:repeat>. Rather, it's being treated as a string.

Alessandro Vernet wrote

Philip,

Philip.Cantin wrote

It looks to me as if, in citeinfo.xhtml, the $citeinforepeat variable isn't even being recognized within the id attribute of <xf:repeat>. Rather, it's being treated as a string.

This is exactly what happens. If you write <xf:repeat id="$citeinforepeat" nodeset="citeinfo">, the value of the "id" attribute is interpreted as a string, not an XPath expression.

Since you are including a piece of code multiple times in your page, it looks as if you are aiming at creating a reusable component, which is exactly what XBL is for. The XBL engine will solve all those IDs problems for you, so I'd recommend you have a go at writing an XBL component for this. See:

http://wiki.orbeon.com/forms/doc/developer-guide/xbl-components-guide

Alex

Philip.Cantin wrote

1) Firstly, I'm trying to get the simplest of examples to work in Orbeon; is there something special needed to use XBL bindings in Orbeon? The example I have attached to this message works fine in Firefox 3.0.11, but I get a blank page when running it in Orbeon 3.7.1 (Developer Release).

Philip.Cantin wrote

2) My initial approach to the unique ID problem was to create an XBL binding with a <template> element that would store all of the XForms code associated with the code I am trying to reuse, and have a variable attached to the repeat id (and all other ids in the reused code), which would come from a Javascript function. Is this a good approach, or would xxforms:variable work better here? What is making me lost is figuring out whether XBL alone can make components reusable AND unique, or just reusable (and the uniqueness must be derived through a separate script).

Alessandro Vernet wrote

Philip,

Philip.Cantin wrote

1) Firstly, I'm trying to get the simplest of examples to work in Orbeon; is there something special needed to use XBL bindings in Orbeon? The example I have attached to this message works fine in Firefox 3.0.11, but I get a blank page when running it in Orbeon 3.7.1 (Developer Release).

Quickly looking at the code, there are quite a few things that won't work. For instance the XBL 2 namespace is http://www.w3.org/ns/xbl (instead of http://www.w3.org/ns/xbl). I'd recommend you start from one of the components we have already built. You can see then in the source here:

http://cvs.forge.objectweb.org/cgi-bin/viewcvs.cgi/ops/orbeon/src/resources-packaged/xbl/orbeon/

Maybe a good one to get started is us-phone, which is quite simple.

Then you need to xinclude your XBL in your XForms. For the fr:* components, we defined a convention and they are automatically included for you. But if you write your own component you have to do this manually.

Philip.Cantin wrote

2) My initial approach to the unique ID problem was to create an XBL binding with a <template> element that would store all of the XForms code associated with the code I am trying to reuse, and have a variable attached to the repeat id (and all other ids in the reused code), which would come from a Javascript function. Is this a good approach, or would xxforms:variable work better here? What is making me lost is figuring out whether XBL alone can make components reusable AND unique, or just reusable (and the uniqueness must be derived through a separate script).

The XBL engine will make sure the instances of your component are unique. For instance, say your component has a <xforms:input id="my-input"> and somewhere in the code for the component you have the action <xforms:setfocus control="my-input">. If as a user of the component has multiple instances of that component on the page, you'll have multiple "my-input" inputs, but the XBL engine will sort things out for you.

Alex