Using window.postMessage(message, uri) in Greasemonkey?

[slickplaid-2]

I'm attempting to write a greasemonkey script that brings up a
messaging window in an iframe that is on a different domain. To send
the information to that iframe from the parent window, I'm trying to
use the postMessage() function, but for some reason I can't get it to
send and/or receive to and from the iframe.

In the greasemonkey script I create a new iframe (I'm using jquery):

        $('body').append('<iframe src="http://mysite.com/api.php" id="com"></
iframe>');

In the api.php, I have:

        window.addEventListener('message', function(e){
                document.getElementById('test').textContent = e.domain+' said:
'+e.data;
        }, false);

Now, further down in the greasemonkey script I try and send a simple
message:

        window.parent.frames[0].postMessage('hello world', 'http://
mysite.com');

It doesn't register and it doesn't throw any errors to let me know why
it isn't sending. I type the above javascript into FireBug and it
displays perfectly in the iframe and registers that it was sent. Why
doesn't this work the same in Greasemonkey? Is there a work-around or
am I calling the window improperly from the chrome or where ever
greasemonkey is relative to the iframe?

I'm really at a loss to exactly why it won't work. Any help would be
appreciated!

Thanks,
slickplaid
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[slickplaid-2]

Has anyone ever tried using postMessage() in a greasemonkey script
before that could suggest anything or give an example on how it was
used properly with greasemonkey? I know how to use it properly outside
of greasemonkey but for some reason it won't in a greasemonkey script.

Any response would be helpful!
Thanks,
slickplaid

On Oct 28, 7:46 pm, slickplaid <slick...@...> wrote:

> I'm attempting to write a greasemonkey script that brings up a
> messaging window in an iframe that is on a different domain. To send
> the information to that iframe from the parent window, I'm trying to
> use the postMessage() function, but for some reason I can't get it to
> send and/or receive to and from the iframe.
>
> In the greasemonkey script I create a new iframe (I'm using jquery):
>
>         $('body').append('<iframe src="http://mysite.com/api.php" id="com"></
> iframe>');
>
> In the api.php, I have:
>
>         window.addEventListener('message', function(e){
>                 document.getElementById('test').textContent = e.domain+' said:
> '+e.data;
>         }, false);
>
> Now, further down in the greasemonkey script I try and send a simple
> message:
>
>         window.parent.frames[0].postMessage('hello world', 'http://
> mysite.com');
>
> It doesn't register and it doesn't throw any errors to let me know why
> it isn't sending. I type the above javascript into FireBug and it
> displays perfectly in the iframe and registers that it was sent. Why
> doesn't this work the same in Greasemonkey? Is there a work-around or
> am I calling the window improperly from the chrome or where ever
> greasemonkey is relative to the iframe?
>
> I'm really at a loss to exactly why it won't work. Any help would be
> appreciated!
>
> Thanks,
> slickplaid

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[esquifit-2]

There is a script "Songkick Bootleg Injector" by author
deathwarmedover  at userscripts.org, sie [1] and [2].

The logic goes along these lines:

The first script [1] runs at domain A. If it detect specific links
pointing to domain B, it opens a popup window with the  document from
domain B.  The second script [2] runs in the pop up window: it calls a
function defined in the document which generates a HTML snippet. It
then fetches the generated snippet code and sends it back to the
opening window via 'postMessage'.  The first window at domain A then
embeds the HTML code in its own document and closes the popup window
at domain B.

I slightly modified both scripts to use an iframe instead of a popup
window. It works as long as you use unsafeWindow when calling
postMessage:  unsafeWindow.parent.postMessage.

I suggest you try

unsafeWindow.parent.frames[0].postMessage('...')


[1] http://userscripts.org/scripts/show/60820
[2] http://userscripts.org/scripts/show/60821

On Sat, Oct 31, 2009 at 4:48 PM, slickplaid <slickpla@...> wrote:

>
> Has anyone ever tried using postMessage() in a greasemonkey script
> before that could suggest anything or give an example on how it was
> used properly with greasemonkey? I know how to use it properly outside
> of greasemonkey but for some reason it won't in a greasemonkey script.
>
> Any response would be helpful!
> Thanks,
> slickplaid
>
> On Oct 28, 7:46 pm, slickplaid <slick...@...> wrote:
> > I'm attempting to write a greasemonkey script that brings up a
> > messaging window in an iframe that is on a different domain. To send
> > the information to that iframe from the parent window, I'm trying to
> > use the postMessage() function, but for some reason I can't get it to
> > send and/or receive to and from the iframe.
> >
> > In the greasemonkey script I create a new iframe (I'm using jquery):
> >
> >         $('body').append('<iframe src="http://mysite.com/api.php" id="com"></
> > iframe>');
> >
> > In the api.php, I have:
> >
> >         window.addEventListener('message', function(e){
> >                 document.getElementById('test').textContent = e.domain+' said:
> > '+e.data;
> >         }, false);
> >
> > Now, further down in the greasemonkey script I try and send a simple
> > message:
> >
> >         window.parent.frames[0].postMessage('hello world', 'http://
> > mysite.com');
> >
> > It doesn't register and it doesn't throw any errors to let me know why
> > it isn't sending. I type the above javascript into FireBug and it
> > displays perfectly in the iframe and registers that it was sent. Why
> > doesn't this work the same in Greasemonkey? Is there a work-around or
> > am I calling the window improperly from the chrome or where ever
> > greasemonkey is relative to the iframe?
> >
> > I'm really at a loss to exactly why it won't work. Any help would be
> > appreciated!
> >
> > Thanks,
> > slickplaid

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