[Exist-open] Adapting JQuery File Upload Demo to eXist-db

[Joe W. <jo...@gm...>]

Hi all,

I've been working on adapting the JQuery File Upload Demo [1] to
eXist-db.  I believe that Wolfgang used this library for the file
upload widget in eXide, but my aim is to create a general EXPath Repo
package (.xar file) [2] containing the original demo simply adapted to
eXist-db with the fewest changes necessary to produce the same results
as the original demo.  (The original demo provides sample server side
code for PHP, nodejs, This package could be useful to anyone who needs
to implement their own file uploader widget.

Unfortunately, my version suffers from the following problems so far:

1. Drag and drop into the browser window fails, even though it works
just fine with the original online demo [1].  In my version, the
browser treats the drag and drop action as either "open this file in
the browser window" or "download this file".  I would expect the
browser to add the dragged-in file to the list of files to upload, as
in the original online demo.

2. Clicking on Add Files brings up the file chooser, but when I click
on Upload file, I get this error:

{
    "name": null,
    "error": "exerr:ERROR err:XPTY0004: checking function parameter 1
in call xmldb:encode-uri(untyped-value-check[xs:string, $name]):
XPTY0004: The actual cardinality for parameter 1 does not match the
cardinality declared in the function's signature:
xmldb:encode-uri($string as xs:string) xs:anyURI. Expected
cardinality: exactly one, got 0. [at line 70, column 72, source:
/db/jQuery-File-Upload/server/xq/upload.xql]\nIn
function:\n\tupload:upload(item()*, item()*, item()*)
[70:9:/db/jQuery-File-Upload/server/xq/upload.xql]"
}

This error suggests that the upload.xql handler isn't receiving the
"file[]" parameter from the upload form.  Needless to say, the
uploader completely fails to upload!  :(

I've attached the .xar file with the demo as it currently stands, and
so my hope is that if you're interested in taking a look at this
problem, you can install the .xar file and try troubleshooting or
debugging.  I'm using a recent version of trunk: eXist-db 2.1dev rev.
16847, on Chrome v20, on Win XP.

By the way, the changes I made to the original demo distribution are as follows:

0. Included original distribution's index.html file and cors, css,
img, js, and server directories with identical structure

1. Updated index.html to be a valid XML file, closing <br> tags, etc.

2. Created an upload handler in server/xq/upload.xql, modeled on
eXide's modules/upload.xql

3. Created a controller.xql and modules/view.xql to apply correct
serialization to index.html, modeled on eXide here too

4. Created EXPath repo files

Can anyone suggest how I can overcome the problems I noted above?

Many thanks,
Joe


[1] http://blueimp.github.com/jQuery-File-Upload/

[2] http://exist-db.org/exist/repo/repo.xml