Hi Alain,
Thanks for your feedback!
The option of extending the xf:load action seemed to be the most natural option
in the end. It's quite similar to how download actions are written in HTML 5,
and basically corresponds to option #2 in my initial posting on the topic,
however, leveraging the existing XForms xf:load element and the standard
extensibility slots instead of inventing a non-standard download element. Both
option #3 and #4 seemed unnatural for the task in the end.
With the numerous other extensions I had to do in my project I (temporarily)
gave up the ability to do easy upgrades in the future. I may try to recover it
at some point. For this one I had to do slight modifications to both
xsltforms.xsl and xsltforms.js.
However, this particular extension could probably be implemented in more of
plug-in manner if extension attributes were exposed to script methods, as you
suggest. In my implementation I also allow the filename parameter to be
specified via either an attribute or a child element (similar to the resource
attribute), but I guess this could still be catered for in some generic way.
My custom XPath function "create-object-url(string-object, mediatype, encoding,
lifetime)", which basically mimics the URL.createObjectURL() Javascript
function, was necessary to add in order to make this work. It came in handy to
solve some other problems as well. Such extensions to XSLTForms' XPath
functions library are currently easy to add/plug-in. Like it should be!
Kind regards,Mats
On Sun, 10 Apr 2016 20:53:01 +0200 [email protected] wrote :
Hi Mats,
From the XForms Recommendation point of view, it is already
possible to write an instance to disk using the "file:" protocol.
As you know, for security reasons, browser vendors have decided
not to allow file writing. XSLTForms includes a small Java applet
which can write a file but, again for security reasons, I chose to
first display the "Save as" dialog to alert the user and allow
him/her to cancel this. XForms submissions have many attributes
which can modify the serialization, concerning validation,
relevance, for example. I am still perplex about the pertinence of
defining submissions within the model: it sounds declarative but
it might as well be considered as an action (and the submit
action, indeed, has no parameter except the submission id...).
Actions are written with an XML notation and I am not, also, that
much convinced that a script notation would be worse. Because I am
now implementing XQuery 3.1 in Javascript for XSLTForms v2, I am
thinking of actions being written in XQuery syntax and annotations
to bind XQuery functions to Javascript ones. Different XML-DB
implementations already have their own XQuery library modules for
standard purposes such as file management.
Anyway, I am happy to see that you succeeded in implementing what
you need and my current concern is now how new XSLTForms v1
releases might not disturb this...
First, you added an attribute to the action: it means you had to
modify xsltforms.xsl for generating the corresponding Javascript
object. To prevent this, I should better expose all action
attributes in the Javascript part not as separate parameters but
as named properties (without namespace prefix...) within a unique
Javascript object. What do you think?
Of course, the load Javascript object in xsltforms.js has been
extended... Do you have any idea about how to help you to manage
this with next builds?
Second, you are using your own functions in expressions. Are they
pure Javascript functions or are they added to standard XPath
functions. Actually, in both cases, you don't have to modify
xsltforms.js, is that correct?
Best regards,
Alain
Le 07/04/2016 23:08, Mats Eklund a écrit :Hi Alain,
Thought I should share with you the solution I arrived at
in the end for the problem how best to implement downloading
of instances to disk:
<xf:load
target=”xsltforms:download” xsltforms:filename="data.xml">
<xf:resource
value="create-object-url(serialize(instance('data')),'text/xml')"/></xf:load>
Regards,Mats
Date: Mon, 21 Sep 2015 09:09:13 +0000
Hi Alain,
Somewhat related to my previous question how best
leverage HTML 5 Web Workers for async processing in
XForms/XsltForms, I now have a similar question, this
time related to how best to leverage browsers'
capability to allow downloading of resources client-side
utilizing the HTML 5 @download attribute on the
<a/> element combined with the
URL.createObjectURL() method of the File API
(http://www.w3.org/TR/FileAPI/#dfn-createObjectURL),
and am interested to get your opinion on possible
options of extending XsltForms.
Obviously it is possible already now to leverage
these features in XsltForms via the <xf:load
resource="javascript:..."/> or
<xf:script/> elements, but I'm thinking this
functionality should rather be exposed through and
encapsulated in a proper XForms extension element.
I was first figuring around the following options:
<xf:download
ref/value=""/> as a control element,
"mirroring" the <xf:upload/> control
already part of the XForms specification<xf:download
ref/value=""/> as an _action_ element,
allowing it to be used in event handlers for the
<xf:trigger/> element for example, similar
to the <xf:load/> action element. (I'm
wondering why the <xf:upload/> wasn't made
an action element in XForms as well...?!)
At the same time, other options also exist:
A custom
@appearance attribute on the <xf:output/>
element (as in Orbeon Forms:
http://wiki.orbeon.com/forms/doc/developer-guide/xforms-controls/output-control?pli=1#TOC-Appearance-xxforms:download)Extended
behavior
of the <xf:submission resource="file://"
method="get/put".../> element... ...
What are your thoughts here? Which option would make
most sense in your view?
Regards,Mats
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