I've got a little further (or a different error message) - running the
compiled code in Firefox 3.6 (as it supports the HTML5 File API) I get
the following Javascript Error...
"_FileReader_handlerManager is undefined" - I know nothing about
the mechanics of how GWT takes my Java Classes and turns them into
Javascript, but I do know that I'm creating the HandlerManager (in the
FileReader) as I can debug when I'm attaching the event handlers and
the handlerManager is being created and attaching the handler...
So can anyone help - as to why the instance of HandlerManager in
FileReader is undefined (which I think equates to null in GWT/Java
speak)?
Cheers,
Dave
On Jan 21, 4:49 pm, DaveC wrote:
> OK,
>
> I've have a working implementation in IE, FF and Chrome (using Gears
> where necessary - GWT 2.0) that allows me to capture when a file is
> dragged from the desktop and dropped into the browser window.
>
> The next part of the puzzle is to grab the file data/content and
> upload it... grabbing the data is trivial when using the Gears
> implementation (as Gears creates a Blob as a property of the File -
> I've implemented my own GWT Gears API as the one on Google Code wasn't
> compatible with GWT 2).
>
> I've created a GWT implementation of the HTML5 File spec (FileList,
> FileError, File... etc) and have a FileReader that does the reading of
> the file in browsers that currently support the spec (Firefox 3.6)
>
> I've created a bunch of Handlers and Events for the FileReader
> (loadstart, loadend, progress etc) and I've added a HandlerManager to
> my FileReader class... and this is where things go wrong...
>
> The events come out of the Native (javascript) FileReader which calls
> (for instance) LoadStartEvent.fire() which gets all the way to the
> HandlerManager in the FileReader class and then a low level (JS) error
> is thrown... something like "cannot find static" it also appears
> to be not detectecting that (for instance) the event passed in is a
> LoadStartEvent - it just thinks it's a generic GwtEvent...
>
> My question is should I be using HandlerManager? Or is this only
> supposed to be for Widgets... I cannot believe that something like
> this is so hard/complicated to do in GWT/Java... when I have a fully
> working JS version (in a about 20 lines of code) - I'm trying to port
> to GWT for use inside an Enterprise B2B app...
>
> Please, are there any GWT engineers/experts listening that can (at
> least) point me in the right direction - I realise that there are
> probably NDAs relating to how to do this in GWT (because of the WAVE
> Client App) - but just a nod in the right direction would help...
>
> My intention is to open source all this once I've got something that
> works.
>
> Cheers,
> Dave
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