Name: sg39081 Date: 08/04/99


My applet uses 'netscape.JSObject' (LiveConnect) method to
interact with the browser. The applet runs ok using Java Plugin 1.2
.2
on Netscape 4.08 (Netscape 4.5 crashes when it starts loading
Java Plugin 1.2), but it does not work on MSIE 4.0 using
Java Plugin 1.2.

The source code and html files can be located at:

  http://www.dcs.uky.edu/~yuan/testJS/

open 'main.htm' to test the applet.

I am aware that there are differences between NC and MSIE in supporting JavaScript.
So I am not sure whether it is the browser problem or Java Plugin problem.

The problem still remains with Java Plugin 1.2.2.

Here is what I do:

  JSObject o0, o1, o2, o3, o4, o5, win;

  // Try to get the value of 'parent.frames[1].document.location.href'
  win = JSObject.getWindow(this);
  o0 = (JSObject)win.getMember("parent");
  o1 = (JSObject)o0.getMember("frames");
  o2 = (JSObject)o1.getSlot(1);
  o3 = (JSObject)o2.getMember("document");
  o4 = (JSObject)o3.getMember("location");
  o5 = (JSObject)o4.getMember("href");

In NC 4.61, the values for o1 to o5 are (value returned by the toString() method of o1 - o5):

o0: self.parent
o1: self.parent.frames
o2: self.parent.frames[1]
o3: self.parent.frames[1].document
o4: self.parent.frames[1].document.location
o5: http://www.dcs.uky.edu/ ......

In MSIE 5.0, the values are:

o0: sun.plugin.javascript.ocx.JSObject@df59d904
o1: sun.plugin.javascript.ocx.JSObject@dff5d904
o2: sun.plugin.javascript.ocx.JSObject@dda9d904
o3: NullPointerException

at sun.plugin.javascript.ocx.JSObject.setActiveXAppletContext(JSObject.java, Compiled Code)
at sun.plugin.javascript.ocx.JSObject.invoke(JSObject.java, Compiled Code)
at sun.plugin.javascript.ocx.JSObject.getMember(JSObject.java, Compiled Code)
at testJS.getMember.getMember(testJS.java, Compiled Code)
...


The is the second test case:
  // Try to get the value of 'parent.displayWindow.document.location.href'
  // where 'displayWindow' is the name I assigned to the second frame.
  // The applet is in the first frame.

  JSObject o0, o1, o2, o3, o4, o5, win;

  // Try to get the value of 'parent.frames[1].document.location.href'
  win = JSObject.getWindow(this);
  o0 = (JSObject)win.getMember("parent");
  o1 = (JSObject)o0.getMember("displayWindow");
  o2 = (JSObject)o1.getMember("document");
  o3 = (JSObject)o2.getMember("location");
  o4 = (JSObject)o3.getMember("href");

In NC 4.61:

o0: self.parent
o1: self.parent.__pluginVar29
o2: self.parent.__pluginVar29.document
o3: self.parent.__pluginVar29.document.location
^^ This number increases everytime I click a button which
causes the execution of the above few lines of code.
o4: Has to be one of these two values: null or 'undefied'.

In MSIE 5.0:

o0: sun.plugin.javascript.ocx.JSObject@XXXXXXXX
o1: sun.plugin.javascript.ocx.JSObject@XXXXXXXX
o2: sun.plugin.javascript.ocx.JSObject@XXXXXXXX
o3: sun.plugin.javascript.ocx.JSObject@XXXXXXXX
o4: http://......

where XXXXXXXX represents some hex number

If I replace the last line of code by

  o4 = o3.setMember("href", "http://www.javasoft.com");

Nothing happens in IE5.0. But if I replace the last line in test case one by

  o5 = o4.setMember("href", "http://www.javasoft.com");

Everything works ok in NC 4.61.

Hope these info help.
(Review ID: 52415)
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