Thanks ChrisK,, You've done a smart job.. It is working. On Tuesday, October 23, 2012 6:53:21 PM UTC+5:30, ChrisK wrote: > > There were a few problems here. My first example calls a zero args > function but is not formatted correctly. > > If you call something like this: > [email protected]::callback(); > > It won't work. It needs the method signature and parameters separated (no > args signature doesn't imply no args last time I checked in GWT): > [email protected]::callback()(); > > Notice the additional set of brackets. Very briefly mentioned on > https://developers.google.com/web-toolkit/doc/latest/DevGuideCodingBasicsJSNI > . > > For the final code, I ended up passing "this" as a parameter from Java and > also wrapping the JS callback function so it ends up looking like this: > > public PlayerImpl() { > initialiseCallbacks(this); > } > > private native void initialiseCallbacks(PlayerImpl impl) /*-{ > $wnd.js_callback = $entry(function() { > [email protected]::callback()(); > }); > } > > I hope that helps. > > > On Monday, 22 October 2012 15:23:43 UTC+1, Kartik Kaipa wrote: >> >> Hey >> did you finally get this working. >> I am doing the exact same thing >> I pass in the instance of the object as a parameter in the function method >> >> Could you post the working code that you have. >> Would really apreciate it. >> >> Thanks, >> Kartik >> >> On Tuesday, March 23, 2010 7:31:24 PM UTC+5:30, Olivier Monaco wrote: >>> >>> ChrisK, >>> >>> For instance method, you need to reference the method from the >>> instance like "this.@...". Here is my exact code that compile: >>> >>> private native void installListener() >>> /*-{ >>> var callback = $entry(this. >>> >>> @net.antidot.gwtcommon.mvp.share.client.channel.HTML5MessageChannel::process(Lnet/ >>> antidot/gwtcommon/mvp/share/client/channel/HTML5MessageEvent;)); >>> $wnd.addEventListener("message", (function(callback, channel) { >>> return function(event) { >>> callback.call(channel, event); >>> }; >>> })(callback, this), false);; >>> }-*/; >>> >>> Sorry, I forgot that... >>> >>> Olivier >>> >>> On 23 mar, 13:58, ChrisK <[email protected]> wrote: >>> > Actually, Olivier's methods work in development mode but don't seem to >>> > compile with this error: >>> > >>> > "Cannot make an unqualified reference to the instance method callback" >>> > >>> > I've tried the pre-assignment of "this" to "var that" and also an >>> > argument to the JSNI method passing in my instance. I've tried both of >>> > these with Olivier's first method as well as the second to avoid >>> > leaks. All with the same result - working in development mode but not >>> > when I compile. >>> > >>> > It looks to me as though the compiler doesn't understand the call >>> > method or the closure correctly. It looks at though it's trying to >>> > parse the @mypackage.MyClass::MyMethod() and seeing it's an instance >>> > method so failed (instead of looking at subsequent JavaScript). Of >>> > course I could quite easily be doing something wrong. >>> > >>> > Thomas - your method compiles fine so I guess I'll use that for now. >>> > >>> > On Mar 23, 10:07 am, ChrisK <[email protected]> wrote: >>> > >>> > > Ahhh ok. Sorry for the simple questions but I'm just getting my head >>> > > around all this. I also have some other methods with arguments and >>> > > have those working thanks to both of you. >>> > >>> > > On Mar 23, 9:56 am, Olivier Monaco <[email protected]> wrote: >>> > >>> > > > ChrisK, >>> > >>> > > > On 23 mar, 10:32, ChrisK <[email protected]> wrote: >>> > >>> > > > > Thomas - your solution worked from 6 worked but at first I didn't >>> > > > > include both pairs of brackets after the function call >>> "MyMethod" but >>> > > > > it turns out they are required. With only one set (i.e. no >>> arguments), >>> > > > > it just doesn't work. I thought that was legal but maybe not. >>> > >>> > > > Remember that "@mypackage.MyClass::MyMethod()" is a reference to >>> the >>> > > > function, not a call. The parenthesis allow you to give the full >>> > > > signature of the method. Java allows two methods to have the same >>> name >>> > > > but different parameters. GWT needs the "full" signature to find >>> which >>> > > > method you want to reference, even is there is only one method with >>> > > > this name. >>> > >>> > > > The second parenthesis are to call the method. If you forgot then, >>> you >>> > > > just obtain the function object and do nothing with it... >>> > >>> > > > Olivier >>> > >>> > >>> >>> a\@a >>> >>>
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