Re: [Jython-users] Questions about Jython and browser applets

[Samuele P. <ped...@bl...>]

For the minimal common capability related
to what you ask for applets see:

http://java.sun.com/docs/books/tutorial/applet/appletsonly/index.html
http://java.sun.com/docs/books/tutorial/applet/appletsonly/browser.html

regards, Samuele Pedroni.

----- Original Message ----- 
From: Gary Herron <res...@ve...>
To: dman <ds...@ri...>; <jyt...@li...>
Sent: Friday, November 30, 2001 11:49 PM
Subject: Re: [Jython-users] Questions about Jython and browser applets


> Another applet related question:
> 
> Can an applet communicate with or control the browser in which it is
> running?  Can it cause its own window or another (perhaps newly
> created) window request and display a URL of its choosing?  Can it
> close down browser's window?  Or can it communicate with javascript
> where all these things are easily accomplished?
> 
> Most importantly if any communication from an applet to the browser is
> possible, what is a good resource to learn more about this?
> 
> Thanks,
> Gary.
> 
> 
> 
> 
> On Thursday 29 November 2001 08:47 pm, dman wrote:
> > On Thu, Nov 29, 2001 at 03:43:08PM -0800, Gary Herron wrote:
> > | I'm very familiar with CPython, but I know almost nothing about
> > | Jython, and even less about writing browser applets, so this brings me
> > | to several questions.
> > |
> > | My application, which is mostly viewable on a browser as static web
> > | pages and flash movies with a little javascript thrown in, now has a
> > | need to execute a small amount of code on the users machine.  I'd like
> > | to write that code in Jython and have the user's browser download and
> > | execute it as an applet.
> > |
> > | The hitch is that the applet must access things which, I think, are
> > | not allowed for applets, such as
> >
> > what a hitch!
> >
> > |   creation of files somewhere on the hard disk
> > |   calls to os.system -- does Jython even HAVE os.system or equiv?
> >
> > Not built-in, however this can be made from the java classes quite
> > easily.  I would paste in what I had, but I can't access that
> > project's source right now (and I don't want to give you buggy stuff
> > off the top of my head).
> >
> > | Is it true that suc access is not normally available from an applet?
> >
> > yes.
> >
> > | Is there a way to create applets that have this kind of access to the
> > | user's system?
> >
> > yes.
> >
> > | Can the user decide, if he trusts me sufficiently, to grant an applet
> > | such access?
> >
> > yes.  To do so requires signing the applet, I think, so that the
> > browser prompts the user to either grant or deny the permission.  For
> > galeon or mozilla on linux the user can create a ~/.java.policy file
> > to give rights to an applet, regardless of whether or not it is
> > signed.  I used this to demo an applet I made that needed EJB
> > and naming services.
> >
> > HTH,
> > -D
> 
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