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

[Alain C. <ala...@ag...>]

Hello,

Javascript URIs are not already supported in XSLTForms for submissions.

I was just asking if it could be interesting because it shouldn't be 
difficult to implement and it would be quite elegant.

What do you think?

Thanks!

-Alain

Le 09/11/2011 03:31, C. M. Sperberg-McQueen a écrit :
> 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
>> ****************************************************************
>>
>>
>>
>>