Accessing java applet public variables

Wed Feb 19 01:48:21 PST 2014

On 02/18/2014 07:50 PM, JvR O wrote:
> I sent values to the signed applet.
>
> On html:
>
>          <applet
>                  id='appletid'
>                  codebase="/demo/"
>                  code='appletpkg.appletclass'
>                  archive='./sapplet.jar'
>                  width=1 height=1>
>             <param name="valuename1" value="value1">
>          </applet>
>
> In the applet public class:
>
>      public String[] str = new String[100];
>
>      @Override
>      public void init() {
>
>          nstr = this.getParameter("valuename1");
>          //TODO
>          this.str[0]= "appletstringvalue1";
>
>      }

 From your description is not clear whats wrong.

The access from applet is 100% working.
We have eg this tests 
http://icedtea.classpath.org/hg/icedtea-web/file/d2563e68c74a/tests/reproducers/simple/AppletTakesLastParam/ 
and it is long term passing one.

>
> At javascript:
>
>       var a = document.getElementById('appletid');
>       var jstr = a.str;
>
>       alert('jstr: '+jstr[0]);

 From html - it is working to. But it is the question for browser then. Or not?

<html>
<body>
     <applet
                   id="appletid"
                   codebase="/demo/"
                   code="appletpkg.appletclass"
                   archive="./sapplet.jar"
                   width="100px" height="100px">
              <param name="valuename1" value="value1">
           </applet>
<script>
function myFunction()
{
var a = document.getElementById('appletid');
var b = a.getElementsByTagName('param');
        alert('jstr: '+b[0].getAttribute("value"));

}

</script>
<button type="button" onclick="myFunction()">Try it</button>
</body>
</html>

>
> If I use a similar script with ORACLE JRE on windows or mac the alerts shows a string.
>
>      jstr: appletstringvalue1
>
> But if I use similiar script on ubuntu with OPENJDK I receive.
>
>      jstr: undefined
>
> The java.log shows the value of jstr if I print to the log in both cases.
>
> Why Javascript is not receiving the applet values on linux or openjdk?

tbh this is the first time I'm seeing this approach. Not sure if it is standart on[1]
>
> The conversion of the objects (Java/Applet to JS) works correctly in the ORACLE JRE but with OPENJDK
> wich comes with linux (Ubuntu or Fedora, etc) is not working, or maybe I need to access to JavaArray
> in a different way?
>
>
> Any suggestion?
>
yes - use the DOM:)

But it donot exclude that this is bug in ITW.

j.

[1] 
http://docs.oracle.com/javase/tutorial/deployment/applet/invokingAppletMethodsFromJavaScript.html 
..well they could not make it simpple...

This approach is heavily tested in ITW... But yes. The arrays have sometimes probelms.