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Index › Programming Questions & Help › Syntax Questions › javascript exception

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javascript exception (Read 1953 times)

poliph

javascript exception
Jul 23^rd, 2007, 4:47pm

Hi all,

I need to call a javascript function from processing, everytime I rollover a button. If I use normal buttons from a library (Interfascia)it works with no problem when I click on a button, but since I don't need normal buttons and I need rollover, using this is not optimal. If I use a simple button class it executes the function on th first rollover and then it blocks the applet throwing me this in the java console:

Error while running applet.
java.lang.ClassCastException: java.lang.String cannot be cast to netscape.javascript.JSObject
at AC_buttonsOver.update(AC_buttonsOver.java:87)
at AC_buttonsOver.draw(AC_buttonsOver.java:57)
at processing.core.PApplet.handleDisplay(PApplet.java:1355)
at processing.core.PGraphics.requestDisplay(PGraphics.java:564)
at processing.core.PApplet.run(PApplet.java:1450)
at java.lang.Thread.run(Unknown Source)
java.lang.ClassCastException: java.lang.String cannot be cast to netscape.javascript.JSObject
at AC_buttonsOver.update(AC_buttonsOver.java:87)
at AC_buttonsOver.draw(AC_buttonsOver.java:57)
at processing.core.PApplet.handleDisplay(PApplet.java:1355)
at processing.core.PGraphics.requestDisplay(PGraphics.java:564)
at processing.core.PApplet.run(PApplet.java:1450)
at java.lang.Thread.run(Unknown Source)

Does someone have an idea of what's the problem, is there some walkthrough?

poliph

Re: javascript exception
Reply #1 - Jul 23^rd, 2007, 5:04pm

This is the actual Processing code I'm testing:

http://chronos.zkm.de/~luis/tests/sketcher.html
(the html containing the applet and linking to the .js)

http://chronos.zkm.de/~luis/tests/applet/

(just the applet)

I appreciate any help since my experience with this Live Connect started yesterday and is blocking me completely...
Thanks

« Last Edit: Jul 23^rd, 2007, 6:52pm by poliph »

fjen God Member Offline Posts: 965	Re: javascript exception Reply #2 - Jul 27^th, 2007, 9:46am just call it like this: Code: JSObject.getWindow(this).eval( "alert(\"Processing says hello.\")" ); working example (including an alternative way): http://florianjenett.de/processing/sketchbook/callingjs/index.html F

poliph

Re: javascript exception
Reply #3 - Jul 28^th, 2007, 4:41pm

Thanks Fjen, exactly what I needed. Now I have an issue with mysql, published in this part of the forums:
http://processing.org/discourse/yabb_beta/YaBB.cgi?board=LibraryProblems;action=display;num=1185470339

Someone has told me that I need to "sign" my applet if I want to overcome security issues, but nonetheless you say in the mySQL library docs, that it is only necessary if you're out of localhost...can you give some input perhaps?

Thanks,

P

poliph YaBB Newbies Offline Posts: 34	Re: javascript exception Reply #4 - Jul 28^th, 2007, 5:49pm Another small question...when used within a subclass, the getWindow()method throws an exception: Semantic Error: No applicable overload for a method with signature "getWindow(evolvingCSS_stage3_3.f)" what parameter should I use instead of(this)? thx a lot

fry YaBB Moderator Offline Posts: 2623 mass, usa	Re: javascript exception Reply #5 - Jul 29^th, 2007, 2:03am that's a tricky issue, the short answer is to structure things such that you aren't using 'this' from another tab. you can have your tab call a function in the main tab that uses 'this' to get the window properly and pass it back.

fjen

Re: javascript exception
Reply #6 - Jul 29^th, 2007, 8:20am

... and in case of a subclass just pass an instance of papplet upon initialization into the object:

Code:


MyClass test;

void setup()
{
    test = new MyClass( this );
    test.doSmthng();
}

class MyClass {
    PApplet papplet;
    MyClass ( PApplet _p )
    {
	  papplet = _p;
    }

    void doSmthng () {
	  papplet.println("called from within "+this.getClass().getName());
    }
}

poliph YaBB Newbies Offline Posts: 34	Re: javascript exception Reply #7 - Jul 29^th, 2007, 3:42pm Thanks...yes indeed, I discovered the papplet class just a bit before, nonetheless I declared it as a global variable and it's working. If I get trouble I'll use the instantiation version...

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