Help with calling java functions from javascript

Question

I am using javax.script to interpret javascript from a java applet. it loads the js file into a string, and then does engine.eval(script_string). My question is, how would I make functions in the class file that are available to javascript?
Update: Instead of that, I am loading a js script that will contain all of the usable functions. Here it is:
//core.js for Javasphere 0.31
var pkgs = new JavaImporter(java.lang, java.lang.System, java.awt);
with(pkgs) {
function Abort(msg) {
        var graph = new Graphics();
        g = graph.getgraphics();
        g.drawString(msg, 20, 20);
}When I do engine.eval("Abort(\"something\")"); it throws this error:
javax.script.ScriptException: sun.org.mozilla.javascript.internal.EvaluatorException: error instantiating (0): class java.awt.Graphics is interface or abstract (<Unknown source>#8) in <Unknown source> at line number 8

Answer 1

Eggbertx, let's start from scratch if you don't mind. Say you have this Applet
pubic class MyApplet extends Applet
  String message;
  //CALL THIS METHOD FROM JAVASCRIPT
  public void setMessage(String msg)
    message = msg;
    // this saves you from having
    // to call getGraphics() from JavaScript
    repaint();
  public void paint(Graphics g)
    g.drawString(message, 10, 30);
}Then in your HTML file you may have something like this:
<input type="text" id="msg" value=""></input>
<input type="button" value="Set Message" onclick="setAppletMessage()"></input>
<applet id="myApplet" code="MyApplet.class" width="400" height="100"></applet>And in the JavaScript file:function setAppletMessage()
  var msg = document.getElementById("msg").value;
  document.myApplet.setMessage(msg);
}This is about all you really need to do. See how the Graphics object is no longer in your .js file?
Note: You may run into other difficulties in getting this code to work because of browser, security, or some other pain-in-the-neck issues, but this is the idea.
Eggbertx, I see you added a star to my first post and I think you should take that off because:
1. <tt>Component</tt> is abstract... so you can not call the <tt>new</tt> operator.
2. The call <tt>component.getGraphics()</tt> is not going to work either, because <tt>component</tt> was never created.