Re: [Xsltforms-support] Change instance via JavaScript?

[C. M. Sperberg-M. <cm...@bl...>]

I should mention that I do realize that a simple string-to-string
function can be defined as an XPath extension as shown in the
page on extensions at 
http://en.wikibooks.org/wiki/XSLTForms/XSLTForms_only_Extensions#User-Defined_Functions
-- I'm just trying to get a grip on the method of using a submission to
a Javascript URI as a technique for calling Javascript from an XForms
(specifically XSLTForms) context.

On Nov 8, 2011, at 6:55 PM, C. M. Sperberg-McQueen wrote:

> 
> On Nov 6, 2011, at 3:41 PM, Alain Couthures wrote:
>>> ...
>> Modifying an instance with Javascript instructions is always problematic 
>> because of dependencies to be set for refresh. It could also be very 
>> specific of a version of en implementation...
>> 
>> Maybe the best way would be to just define an extension for submission: 
>> instead of "http:" or "file:", "javascript:" could be used to retrieve a 
>> string from a Javascript instruction.
>> 
>> You could then externally activate a submit action for it.
>> 
>> What do you think?
> 
> 
> Well, I don't know about the original poster, but I think you've just 
> explained to me how to handle a problem I was having without a
> trip to the server.  Thank you!
> 
> However, when I try to put this idea into practice, I encounter 
> a simple practical difficulty.  I want to use Javascript to manipulate a
> string in the document, so I write a function called, say,
> manipulate_string, which takes a string as argument and returns
> a string as its result.
> 
> I can write a submission element that specifies a call to this
> function as the resource, and I can even specify the argument
> (which I have placed in an instance document for the purpose),
> thus:
> 
>       <xf:submission id="hackstring"
> 	 method="get"
> 	 ref="instance('stringhack')/s"
> 	 replace="text"
> 	 targetref="instance('stringhack')/s"
> 	 >
> 	 <xf:resource
> 	     value="concat('javascript:manipulate_string(&quot;', instance('stringhack')/s, '&quot;)')"
> 	     />
>       </xf:submission>
> 
> But before submission, XForms appends "?s=" and the value of the
> XPath expression in the 'ref' attribute, which has the effect that 
> the Javascript call is not recognized so my function never executes.
> 
> Is there a way around this problem?
> 
> -- 
> ****************************************************************
> * C. M. Sperberg-McQueen, Black Mesa Technologies LLC
> * http://www.blackmesatech.com 
> * http://cmsmcq.com/mib                 
> * http://balisage.net
> ****************************************************************
> 
> 
> 
> 

-- 
****************************************************************
* C. M. Sperberg-McQueen, Black Mesa Technologies LLC
* http://www.blackmesatech.com 
* http://cmsmcq.com/mib                 
* http://balisage.net
****************************************************************