Unable to access Applet methods from javascript

anonymous · Jan 15, 2004

This is what I'm doing. It works in Netscape but doesn't work in IE
6. I thought it should, any ideas?

File: FirstApplet.java
----------------------

import java.applet.Applet;

public class FirstApplet extends Applet {
public String firsttest() {
return "Hello World";
}
}

File: test1.html
----------------

<html><body>
<APPLET
NAME="myapplet"
CODEBASE="."
CODE="FirstApplet.class"
WIDTH=1
HEIGHT=1>
</APPLET>
<script>
var answer = document.myapplet.firsttest();
alert ( answer );
</script>
</body></html>

Ike · Jan 15, 2004

Take a look at :

http://www.technalink.com/vdist/common/trouble1.htm

Also, go into the XP Control panel, open java plugin - browswers tab - make
sure MS IE is checked -Ike

Andrew Thompson · Jan 15, 2004

| This is what I'm doing. It works in Netscape but doesn't work
in IE
| 6. I thought it should, any ideas?

I am not surprised it does not work*,
Browser support for such features is
often patchy. AFAIU it was Netscape
that is mostly responsible for JavaScript,
and they developed the API for Java/JS
interaction.

Does it work in Opera?

* And for those that know me well,
I better add that this is one of the
_few_ times that I will not blame MS!

Andrew Thompson · Jan 15, 2004

| Take a look at :
|
| http://www.technalink.com/vdist/common/trouble1.htm
|
| Also, go into the XP Control panel, open java plugin -
browswers tab - make
| sure MS IE is checked -Ike

....err. That page actually advises
_un_cheking the MS JVM, Ike.

You're a bit loose with the fine details.. ;-)

Ike · Jan 15, 2004

Thats Right. Why run in the MS JVM ???? Let the Sun plugin run it in MSIE,
and allow for the javax packages. -Ike

JScoobyCed · Jan 16, 2004

Well, I have an applet (JApplet, but that doesn't change anything) that is
called by a JavaScript. There are something to consider:
you have to wait the applet is completely loaded and instancied before JS
can access it. For example use a button:
<APPLET name="myapplet" codebase="." code="FirstApplet" width="1"
height="1">
</APPLET>
<input type="button" value="Test JS"
onclick="javascript:alert(document.myapplet.firsttest())">

I compiled your code and use the above code in a html file, it works on IE
5(Win98) and IE 6(Win2000)

JScoobyCed
-------------

anonymous · Jan 16, 2004

Thanks JScoobyCed, it was a timing issue. And infact that is how I
need to use it, I don't actually need to have it run right at page
load. I wonder how you could force the upload to occur or test that
it has happened and wait for it. Any ideas?

Thanks,

Fenton

Andrew Thompson · Jan 16, 2004

| Thanks JScoobyCed, it was a timing issue.
.....
.....
| > onclick="javascript:alert(document.myapplet.firsttest())">

I suggest one of two strategies.
a) define an attribute in the applet that starts out
"null", and set it to "loaded" at the end of init().
Use JavaScript to get it. If it is undefined or
"null" the applet is not ready.
b) get firsttest to return a 'true' when it completes
successfully, and test _that_ in the JS..

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Unable to access Applet methods from javascript

anonymous

Ike

Andrew Thompson

Andrew Thompson

Ike

JScoobyCed

anonymous

Andrew Thompson

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