bind 'readonly' to upload control?

In my application I've cribbed from the xforms-upload example, but I  
want to extend it so that the "upload" trigger is in readonly mode  
(inactive button) until the user has selected a file for upload.  
Below are the relevant parts of my view:

             <xforms:instance id="request-instance">
                 <form xmlns="">
                     <action/>
                     <document-id/>
                     <file filename="" mediatype="" size=""  
xsi:type="xs:anyURI"/>
                 </form>
             </xforms:instance>

             <xforms:instance id="control-instance">
                 <control xmlns="">
                     <upload-trigger/>
                 </control>
             </xforms:instance>

             <xforms:bind nodeset="instance('control-instance')/
upload-trigger" readonly="instance('request-instance')/file = ''"/>

             <xforms:group ref="instance('request-instance')">
                             <xforms:upload ref="file">
                                 <xforms:filename ref="@filename"/>
                                 <xforms:mediatype ref="@mediatype"/>
                                 <xxforms:size ref="@size"/>
                             </xforms:upload>
                             <xforms:trigger ref="instance('control-
instance')/upload-trigger">
                                 <xforms:label>Upload</xforms:label>
                                 <xforms:action ev:event="DOMActivate">
                                     <xforms:setvalue  
ref="action">upload</xforms:setvalue>
                                     <xforms:send submission="upload-
submission"/>
                                 </xforms:action>
                             </xforms:trigger>
             </xforms:group>

The bindind works, however the "upload" button never becomes active  
after browsing for a file to upload.  I did a test with  
<xforms:output ref="file"/> and confirmed that the request-instance  
is not updated at run-time with the name of the file.  I know how to  
do this with javascript, but is there an xforms way to make the  
upload trigger enabled only after the user has selected a file with  
the upload control?

Many thanks in advance.

Duane Gran



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Duane,

 > In my application I've cribbed from the xforms-upload example, but I
 > want to extend it so that the "upload" trigger is in readonly mode
 > (inactive button) until the user has selected a file for upload.
 > Below are the relevant parts of my view:

[...]

 > The bindind works, however the "upload" button never becomes active
 > after browsing for a file to upload.  I did a test with
 > <xforms:output ref="file"/> and confirmed that the request-instance
 > is not updated at run-time with the name of the file.  I know how to
 > do this with javascript, but is there an xforms way to make the
 > upload trigger enabled only after the user has selected a file with
 > the upload control?

With OPS, the upload control behaves slightly differently from other
controls: the value of an instance data node to which xforms:upload is
bound is not updated as you select a file in the web browser's upload
widget.

Instead the file is uploaded only when you perform a submission with
replace="all" (we hope to support the other replace values soon), and
you cannot assume that the value of the control changes as you tab in
and out of it or as you select a file to upload. This explains why
your code doesn't behave the way you would like it to behave.

I could see how in the future we could provide an "instant upload"
widget, which would start uploading as soon as you have selected a
file (some have done this before us, and it's pretty neat for things
such as email attachments, etc.), and which would set the value in the
instance and fire xforms-value-changed when it completes.

-Erik

--
Orbeon - XForms Everywhere:
http://www.orbeon.com/blog/




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