Passing variables to appletFrame using JavaScript

**Limraj** · 11-06-2009 05:02 PM

I am a complete newbie to Javascript and I have a problem, which may be trivial. Please help.

I have javascript which starts a Java applet and I want to pass data to the applet from another page.

I want to retrieve the data of the variable 'port' at java_applet.html , which is originally set at info.html.

Thanks for your help.

Posting relevant details.

Window (info.html) - runs javascript to get to java_applet.html.
======================
.
.
<head>
.
.
<script type="text/javascript">
function startJavaApplet(){
if (top.appFrame.appletFrame.location != "java_applet.html") {
top.appFrame.appletFrame.location="java_applet.html";
}else {
top.appFrame.appletFrame.location.reload(true);
}
}
</script>
.
.

</head>
<body onload="myOnLoad()"........>
<form action="#"><input type="hidden" name="port" id="port"value="23"/></form>
.
.
.
<a href="javascript:void(0);" onclick="startJavaApplet();return false;"><b>My Java Applet</b></a>
.
.
.
</body>

java_applet.html - invokes the java applet.
===================

<head>
.
.
</head>

<body>
<script type="text/javascript">

var rport = window.parent.document.getElementById("port"); <== Not working, I get null.
var _app = navigator.appName;
if (_app == 'Netscape') {
document.writeln("<embed code=\"myjavaapp.class\"");
document.writeln("type=\"application/x-java-applet\"");
document.writeln("archive=/html/myjavaapp_001.jar width=1000 height=100");
document.writeln("RCINFO0=\"abcd\"");
document.writeln("RCINFO1=\"21\"");
document.writeln("RCINFO3=\"1\"");
document.writeln("RCINFO6=\""+rport+"\"");
.
.
.
document.writeln("<\/embed>");
}
</script>
</body>

**rnd me** · 11-06-2009 06:14 PM

top.document.getElementById

edit:
or actually, it looks like you're pages are all in the same domain, so just use top everywhere to refer to a common destination for each page.

for example, top.port should reach the same variable on each frame's page.

**Limraj** · 11-06-2009 06:44 PM

Originally Posted by rnd me

top.document.getElementById

edit:
or actually, it looks like you're pages are all in the same domain, so just use top everywhere to refer to a common destination for each page.

for example, top.port should reach the same variable on each frame's page.

It does not work. Following are the errors I get.

top.port - undefined
top.document.getElementById("port").value - Object required

**Limraj** · 11-06-2009 06:48 PM

I am posting complete code now.

info.html

Code:

<!DOCTYPE HTML PUBLIC "-//W3C//Dtd HTML 4.01 Transitional//EN">
<html>
<head>
<script type="text/javascript">
function myOnLoad(){
}
function startJavaApplet(){
if (top.location != "java_applet.html") {
         top.location="java_applet.html";
      }else {
         top.location.reload(true);
      }
}
</script>
</head>

<body onload="myOnLoad()" style="overflow: auto;" class="body-flush-fit">
<form name=myform action="#"><input type="hidden" name="port" id="port"value="23"/></form>
<a href="javascript:void(0);" onclick="startJavaApplet();return false;"><b>My Java Applet</b></a>
</body>

</html>

java_applet.html

Code:

<!DOCTYPE HTML PUBLIC "-//W3C//Dtd HTML 4.01 Transitional//EN">
<html>
<head>
<script type="text/javascript">
function myOnLoad(){
alert("Loaded java_applet.html");
}
</script>
</head>

<body>
<script type="text/javascript">
var pr = top.port;  //Fails
alert("port " + pr);
</script>
</body>

</html>

**rnd me** · 11-06-2009 07:36 PM

i don't see any frames, is this simply a redirect or something?
it seems like info.html should be in a frame to me.

if you are simply changing the page location, there's no way to communicate to a page that doesn't exist at the time, so top won't help.

if that's the case, use name:

Code:

onclick="window.name=23; startJavaApplet();return false;"

then you can change:

Code:

var pr = top.port;  //Fails
alert("port " + pr);

to

Code:

var pr = top.name;  //Fails
alert("port " + pr);

**criterion9** · 11-06-2009 08:47 PM

In the first post you have:

var rport = window.parent.document.getElementById("port");

Which should be:

Code:

var rport = window.parent.document.getElementById("port").value;

**Limraj** · 11-07-2009 08:11 AM

This works.
Thank you very much rnd me.

info.html is indeed part of a frame.

Originally Posted by rnd me

i don't see any frames, is this simply a redirect or something?
it seems like info.html should be in a frame to me.

if you are simply changing the page location, there's no way to communicate to a page that doesn't exist at the time, so top won't help.

if that's the case, use name:

Code:

onclick="window.name=23; startJavaApplet();return false;"

then you can change:

Code:

var pr = top.port;  //Fails
alert("port " + pr);

to

Code:

var pr = top.name;  //Fails
alert("port " + pr);

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