XULRunner: canvas.getContext('2d') failure!

[woute...@gmail.com]

Hello,

This is a code snippet from a HTML file:

var canvas = document.getElementById("main-canvas");
var ctx;
if (canvas.getContext){
canvas.getContext('2d');
}

I use this HTML file in a XUL file by means of the following lines:

<vbox id="startbox" flex="1">
<iframe name="centralpane" width="150" flex="1" src="file://x/
xxxxxxxxx/xxxxxx.html"/>
</vbox>

This XUL code works in Firefox. But it fails in a standalone XULRunner
application. The stops at the 'canvas.getContext('2d')' method. Is
there a workaround for this to get the thing working? Does someone has
any tips to solve this problem?

Thank you for your time,
Wouter

[Sergey Yanovich]

woute...@gmail.com wrote:
> This XUL code works in Firefox. But it fails in a standalone XULRunner
> application. The stops at the 'canvas.getContext('2d')' method. Is
> there a workaround for this to get the thing working? Does someone has
> any tips to solve this problem?

Try to add ' type="content-primary"' to <iframe> attributes or try to
use <browser> instead.

--
Sergey Yanovich

[woute...@gmail.com]

On Sep 19, 12:49 pm, Sergey Yanovich <ynv...@gmail.com> wrote:

Hello,

First of all. Thank you for your reply.

I've tried the two things you suggested but it still failed to work. I
think the problem is the javascript method '.getContext('2d')' (and
not the XUL code ) which doesn't do anything in the standalone
XULRunner application. A check on what this method returned gave
nothing (not even a 'null')! Could this be due to the version of
XULRunner (1.8)? My Firefox version is 2.0.0.6 and this works fine.

Thank you for your help and time!
Wouter

[Gijs Kruitbosch]

Have you checked what the error you're getting is (use the -jsconsole
flag to start your app)? That probably explains something. :-)

~ Gijs

[Michael Vincent van Rantwijk, MultiZilla]

Did you compile XULRunner yourself (--disable-canvas???)?

--
Michael Vincent van Rantwijk
- MultiZilla Project Team Lead
- XUL Boot Camp Staff member (ActiveState Training Partner)
- iPhone Application Developer

[woute...@gmail.com]

On Sep 19, 1:46 pm, Gijs Kruitbosch <gijskruitbo...@gmail.com> wrote:

Hello Gijs,

Thanks for your reply.

I've tried to debug the application with the command: xulrunner
application.ini -jconsole. (and set
pref("javascript.options.showInConsole",true)). Then I looked into the
Javascript Error console. This gave no error. (or I'm I doing
something wrong here?)

Do you have other suggestions?
Thank you,
Wouter

[woute...@gmail.com]

On Sep 19, 2:01 pm, "Michael Vincent van Rantwijk, MultiZilla"
<mv_van_rantw...@yahoo.com> wrote:

> - iPhone Application Developerd

Hello Michael,

Thank you for your reply.

I didn't compile XULRunner for myself. But got it from
http://developer.mozilla.org/en/docs/XULRunner.
(I'm using a Windows machine)

Do you have any other ideas?
Thank you,
Wouter

[woute...@gmail.com]

> I didn't compile XULRunner for myself. But got it fromhttp://developer.mozilla.org/en/docs/XULRunner.

> (I'm using a Windows machine)
>
> Do you have any other ideas?
> Thank you,
> Wouter

Hello,

@Gijs:

I managed to debug something: I get teh following error when I try to
execute the line canvas.getContext('2d');

[Exception..."Component returned failure code: 0x80070057
(NS_ERROR_ILLEGAL_VALUE)
[nsIDOMHTMLCanvasElement.getCOntext]" nsresult: "0x80070057
(NS_ERROR_ILLEGAL_VALUE)"
location: "JS frame::file:///C:/xxxxxxxxxxxx/
test.html::init::line15"data:no]

It seems like the function 'getContext' can't find any data? Does
anybody know how to solve this?

Thank you,
Wouter

[woute...@gmail.com]

Hello,

After some 'googling', I came up with the following useful link:
http://canvex.lazyilluminati.com/tests/tests/spec.html#testrefs.context.empty
This is exactly the error I seem to get. Does anyone know a solution
for this?

Thank you,
Wouter