Re: [Xsltforms-support] [PATCH] Adding extra XPath functions

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OK, i worked around it on Firefox!

Just use the default xpath NS when registering functions:
  http://www.w3.org/2005/xpath-functions
and invoke it without prefix!

Both FF and IE have problem with the time of registration.
Apart from Chrome, the 'load' event seems to run after init-code has run,
so the xpath-to-js xsl template fails.

The patch is still needed for IE and Chrome
if you want to use different NS
(which does not work on FF...).

Note that all browsers work OK:
* without the patch, and
* without the extra NS declaration
as long as any new xpath functions gets registered under the NS:
  http://www.w3.org/2005/xpath-functions.

This trick allows even for redefinition of existent functions.

Happy XPathing!
  Kostis

file: testNewFuncs.xml
----------------------------
<?xml version="1.0" encoding="UTF-8"?>
<?xml-stylesheet href="xsltforms/xsltforms.xsl" type="text/xsl"?>
<?xsltforms-options debug="yes"?>
<html xmlns="http://www.w3.org/1999/xhtml"
     xmlns:xf="http://www.w3.org/2002/xforms"
>
 <head>
   <title>Testing User-Defined XPath functions</title>
   <script >
       XPathCoreFunctions['http://www.w3.org/2005/xpath-functions new-func'] =
         new XPathFunction(false, XPathFunction.DEFAULT_NONE, false,
           function() { return "NEW FUNC"; } );
   </script>
   <xf:model>
     <xf:instance>
       <data xmlns="">HellO </data>
     </xf:instance>
   </xf:model>
 </head>
 <body>
   <p><xf:output value="/data" /> to <xf:output value="concat('My ',
new-func())" />.</p>

 </body>
</html>

On Fri, Apr 9, 2010 at 8:21 AM, Kostis Anagnostopoulos
<ank...@gm...> wrote:
> I was too quick to report "success!"...
>
> I tested on different browsers, and
> * on Chrome it is OK.
>
> * On firefox it does not find the correct NS :-(
> As an aid, i see that the xslt's result root node (the html element)
> does not contain the 'local' NS.
> I then tried the dummy attribute workaround but nothing.
>
> * On IE7 it does not locate the extra function,
> although the XPath expression seems OK,
> and the function's namspace is correct.
> It seems that the the registration code for the extra function does not work!
>
>
> It needs more work, particularly on firefox....
>
>
> Kostis
>
>
> On Fri, Apr 9, 2010 at 4:00 AM, Kostis Anagnostopoulos
> <ank...@gm...> wrote:
>> Hi David,
>>
>> The problem (i think) was that the newer XPath expression parsing templates
>> (as of rev361)
>> for each xpath-expression they filled-in the contents of the variable
>> 'xexprs' with a nodeset
>> created out of the blue, so it had no NS attached - thus, your
>> xmlns:local="..."  declaration was lost.
>>
>> I solved it just by embeding the <xexprs> nodeset within a node from
>> the source document,
>> just by copying the current node.
>>
>> Note that I have not tested the patch thorougly,
>> it just makes your test-case to run ok.
>> For a quicker setup, you can mannually patch the final 'xsltforms.xsl'
>> file in line: 197
>>
>> Regards
>>  Kostis
>>
>>
>>
>> On Tue, Mar 30, 2010 at 9:26 PM, David Cato <ot...@cr...> wrote:
>>> <?xml version="1.0" encoding="UTF-8"?>
>>> <?xml-stylesheet href="xsltforms/xsltforms.xsl" type="text/xsl"?>
>>> <html xmlns="http://www.w3.org/1999/xhtml"
>>>      xmlns:xf="http://www.w3.org/2002/xforms"
>>>      xmlns:local="http://example.com/local">
>>>  <head>
>>>    <title>Testing local XPath functions</title>
>>>    <script>
>>>      window.addEventListener('load', function() {
>>>        XPathCoreFunctions['http://example.com/local sample'] =
>>>          new XPathFunction(false, XPathFunction.DEFAULT_NONE, false,
>>>            function() { return "a test"; } );
>>>      }, false);
>>>    </script>
>>>    <xf:model>
>>>      <xf:instance>
>>>        <data xmlns="">
>>>          <PersonGivenName/>
>>>        </data>
>>>      </xf:instance>
>>>    </xf:model>
>>>  </head>
>>>  <body>
>>>    <p>This is <xf:output value="local:sample()" />.</p>
>>>    <p>Type your first name in the input box. <br/>
>>>       If you are running XForms, the output should be displayed in the output area.</p>
>>>    <xf:input ref="PersonGivenName" incremental="true">
>>>      <xf:label>Please enter your first name: </xf:label>
>>>    </xf:input>
>>>    <br />
>>>    <xf:output value="concat('Hello ', PersonGivenName, '. We hope you like XForms!')">
>>>      <xf:label>Output: </xf:label>
>>>    </xf:output>
>>>  </body>
>>> </html>
>>>
>>
>