Help with JSobject from the netscapte

silvia · #1 (**permalink**) 07-18-2007, 08:54 PM

Hi, I am workig in a project on javascript. For which i need java and javascript communication.
I am working with JSobject from the netscapte and i am getting worked in one way.
When i am invoking the applet thru webpage i am getting the applet methods working with javascript and when i try to acess the javascript or object for getting the webpage contents i am getting the jsexception

here is the applet code i am using

Code:

import netscape.javascript.*;
import java.applet.*;
import java.awt.*;

public class MyApplet extends Applet {
/**
*
*/
private static final long serialVersionUID = 1L;

public void init() {
JSObject win = JSObject.getWindow(this);
JSObject doc = (JSObject) win.getMember("document");
JSObject loc = (JSObject) doc.getMember("location");

win.call("f", null); // Call f() in HTML page
}

public void wish()
{
JSObject win = JSObject.getWindow(this);
JSObject doc = (JSObject) win.getMember("document");
JSObject loc = (JSObject) doc.getMember("location");

Object[] args ={ "hello from java"};
win.call("doit",args);
}

}

Here is the code in html page thru which i am invoking the applet

Code:

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<applet id="Calculator" width="300" height="500" code="MyApplet.class" codebase="." MAYSCRIPT>
<param name="InitialMode" value="Normal">
</applet>
<HTML>
<SCRIPT language="JavaScript">
function f()
{
alert("hello world");
}
function doit(msg)
{
alert("entered do it ");
//var msg = document.Calculator.wish;
alert(msg);
}
function startJSFractal()
{
document.calculator.init();
}
</SCRIPT>

<BODY>
<form name="Form1">
<!--<OBJECT ID="Fractal" WIDTH=500 HEIGHT=120
CLASSID="CLSID:8AD9C840-044E-11d1-B3E9-00805F499D93"
<PARAM NAME="code" value="MyApplet.class">
<PARAM NAME="codebase" value="1.0.2">
<PARAM NAME="level" value="5">
</OBJECT>-->
<input type="button" name="Button1" value="Start"
onClick="document.Calculator.wish()" language="JavaScript">

</BODY>
</HTML>

so when i try to run the applet i am getting the jsexception , but its working with the html page

Code:

netscape.javascript.JSException
at netscape.javascript.JSObject.getWindow(JSObject.java:144)
at MyApplet.init(MyApplet.java:14)
at sun.applet.AppletPanel.run(AppletPanel.java:378)
at java.lang.Thread.run(Thread.java:595)

Thanks

barney · #2 (**permalink**) 08-07-2007, 06:46 AM

After all at it's very beginning (LiveScript was it's maiden name, if I remember well) javascript developed by Netscape supposed exactly to make a communication "bus" between the client-side state and the Java language/applets (the moment Netscape decided to have a partnership with Sun).
Greetings.