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Asked: 2026-06-05T03:10:22+00:00

I am using JSObject to invoke a Javascript function from my Applet. SSCCE of

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I am using JSObject to invoke a Javascript function from my Applet.

SSCCE of my Applet:

package ch.vrag.web;

import java.applet.Applet;
import java.security.AllPermission;
import java.security.CodeSource;
import java.security.PermissionCollection;
import java.security.Permissions;
import java.security.Policy;

import netscape.javascript.JSObject;

public class Sscce extends Applet {

private static final long serialVersionUID = -5403444704039831864L;

public void init() {
    try {
        Policy.setPolicy(new Policy() {
            Permissions perms = new Permissions();

            public PermissionCollection getPermissions(CodeSource codesource) throws SecurityException {
                AllPermission grant = null;
                grant = new AllPermission();
                perms.add(grant);
                return perms;
            }

            public void refresh() {
                // Do nothing
            }
        });
    }
    catch (Exception e) {
    }

    JSObject window = JSObject.getWindow(this);

    JSObject phoneNums = (JSObject) window.eval("getWindowRectangle()");

    int x;
    int y;
    int width;
    int height;

    if (phoneNums.getSlot(0) instanceof Integer) {
        x = (Integer) phoneNums.getSlot(0);
        y = (Integer) phoneNums.getSlot(1);
        width = (Integer) phoneNums.getSlot(2);
        height = (Integer) phoneNums.getSlot(3);
    }
    else if (phoneNums.getSlot(0) instanceof Double) {
        x = ((Double) phoneNums.getSlot(0)).intValue();
        y = ((Double) phoneNums.getSlot(1)).intValue();
        width = ((Double) phoneNums.getSlot(2)).intValue();
        height = ((Double) phoneNums.getSlot(3)).intValue();
    }
    else {
        return;
    }

    System.out.println("x: " + x + " y: " + y + " width: " + width + " height: " + height);

};
}

An SSCCE of my HTML File:

 <?xml version="1.0" encoding="ISO-8859-1" ?>
    <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"     "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
    <head>
        <meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1" />
        <script type="text/javascript">
        function getWindowRectangle(){

            var winX = (document.all)?window.screenLeft-2:window.screenX;
            var winY = (document.all)?window.screenTop-2:window.screenY;

            var winWidth = (document.all)?document.documentElement.offsetWidth+4:window.outerWidth;
            var winHeight = (document.all)?document.documentElement.offsetHeight+4:window.outerHeight;

            return([winX,winY,winWidth,winHeight]);
        }       
    </script>

    <title>SSCCE</title>
</head>
<body>
    this is an SSCCE
    <APPLET CODE="ch.vrag.web.Sscce.class" name="SSCCE" codebase="scripts" archive="Sscce.jar" width=0 height=0 MAYSCRIPT >
    </APPLET>
</body>

This works great exept in Internet Explorer 6. There I have this Java Exception: 

java.lang.Exception: netscape.javascript.JSException: Unknown Name

what is this Exception good for? What am I doing wrong?

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1 Answer

  1. Editorial Team

    The Internet Explorer 6 seems to have a Problem with the getSlot() command, but I could use a Workaround.

    with this Object:
    JSObject phoneNums = (JSObject) window.eval("getWindowRectangle()");

    I can get a String out of phoneNumbs (phoneNums.toString();) this String gives me my return values in this form:

    “number1,number2,number3,number4”

    so I can split the string and get the numbers I need.

    The moral of the story is, that Internet Exlorer 6 is not no contemporary and should not be used any more!

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