On Monday, April 2, 2012 10:26:27 PM UTC+2, Geoffrey Wiseman wrote:
>
> I have a piece of GWT code that I wanted to invoke from outside
> handwritten JavaScript. There's an example shown here under "Calling a Java
> method from Handwritten JavaScript":
>
> https://developers.google.com/web-toolkit/doc/latest/DevGuideCodingBasicsJSNI
>
> That example uses a static method; I can make that work, but my first
> instinct was that i'd rather use an instance, so using the syntax shown
> under JSNI invocations, I tried:
>
> /* package */ native void exportJavascriptMethods( PreviewPane x ) /*-{
> $wnd.imageSelected =
> $entry(this
> @ca.cpp.spike.gwtapplet.client.PreviewPane::imageSelected
> (Ljava/lang/String;Ljava/lang/String;));
> }-*/;
>
> That doesn't work. Eclipse (and the GWT compiler) complain:
> "JavaScript parsing: Missing ) after argument list PreviewPane.java"
>
You're missing the '.' before the '@', so it might be the issue (the parser
chokes on the '@' and says the $entry() call is missing its closing paren,
or something like that).
You'll have another issue when you fix this syntax error though: you get a
reference on the method but, like in Java with java.lang.reflect.Method,
the instance it's called on has to be given at call time.
You have to write:
var that = this;
$wnd.imageSelected = $entry(function(s1, s2) {
return
[email protected]::imageSelected(Ljava/lang/String;Ljava/lang/String;)(s1,
s2);
});
About the "var that = this;", see
http://www.yuiblog.com/blog/2012/03/30/what-is-the-meaning-of-this
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