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Javascript to Applet communication

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mojaffa

mojaffa

Programmer
Oct 23, 2003
8
SE
Hi
Im trying to pass a String from a javascript function to an Applet.
I cant figure out why it does not work..
It looks like this:

Script:
document.theApplet.aFunction("some text");

and Applet:
public void aFunction(String text)
{
System.out.println("Applet: got text:"+text);
repaint();
}

Then I got a Java.lang.Exception error: aFunction{0}:There is no such method.

But if I do like:
Script:
document.theApplet.aFunction();

and Applet:
public void aFunction()
{
System.out.println("Applet: got text!");
repaint();
}

Then I got the correct response: Applet: got text!
 
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I don't know jack about Java, but maybe "text" is a keyword in Java.

Adam
while(ignorance==true){perpetuate(violence,fear,hatred);life--};
 
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Maybe try passing in a String object to the applet. Like:
Code: 
document.theApplet.aFunction(new String("some text"));

Kevin
A+, Network+, MCP
 
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Hi mojaffa, there are a few steps to this. First of all using ASP get the value that you want to pass in to the applet.
<%
dim s
s = Request.Form(&quot;value&quot;)
%>

Then set up a parameter within your <applet></applet> tags as such ...

<applet code=&quot;whatever.class&quot; width=xx height=xx>
<param name=&quot;str&quot; value=<%=s%>>
</applet>

Then in your java class, use the getParameter method to get the value ...

class f{
private String sValue=null;
public void init(){
s=getParameter(str);
System.out.println(str);
}

Please note this is a cut down version of what you need, but these are the steps, let me know how you get on,

Patrick
 
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Im using a form to get the string. I want this string to be available to the applet when the user clicks on submit.
I havent used ASP before. First of all, where do I put the <%...%> code? Im also having the form and the javascript in one frame and the applet in another, makes it somewhat more difficult?
I tried your suggestion Kevin, but with no result.
Then I tried Patricks suggestion, which I think looks promising. But all I got was &quot;Applet:got text:NULL&quot;.
(had the <%...%> code in the header, dont know if that is the right place). Grateful for any further suggestions.
 
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mojaffa, try these and let me know if it works. I'd email them but our system is down :-(

frames.asp (main page)
Code: 
<html>
<frameset cols=&quot;200,*&quot;>
<frame name=&quot;f1&quot; src=&quot;test.asp&quot;>
<frame name=&quot;f2&quot; src=&quot;appletpage.asp&quot;>
</frameset>
</html>

appletpage.asp
Code: 
<%@language=&quot;javascript&quot;%>
<%
	var s
	s = Request.Form(&quot;t1&quot;)
%>
<html>
<body>
<form name=&quot;frm2&quot;>
<h1>Test applet code</h1>
<applet code=&quot;test.class&quot; height=200 width=200>
<param name=str value=&quot;<%=s%>&quot;>
</applet>
<br><br><br>
Value of s = <%=s%>
</form>
</body>
</html>

test.asp
Code: 
<html>
<head>
<script language=&quot;javascript&quot;>
  function check(){
    frm1.submit();
  }
</script>
</head>
<body>
<form name=&quot;frm1&quot; id=&quot;frm1&quot; method=&quot;post&quot; action=&quot;appletpage.asp&quot; target=&quot;f2&quot;>
<input type=&quot;text&quot; id=&quot;t1&quot; name=&quot;t1&quot;><br><br>
<input type=&quot;button&quot; value=&quot;Submit&quot; onclick=&quot;check();&quot;>
</form>
</body>
</html>

test.java
Code: 
import java.applet.Applet;
import java.awt.*;

public class test extends Applet{
	
	String s1 = null;
	
	public void init(){
		s1 = getParameter(&quot;str&quot;);
	}
	
    public void paint(Graphics g){    	
    	g.drawString(&quot;Value of parameter = &quot; + s1,10,10);
    }
}



Patrick
 
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no, couldnt get that to work. Have u got it working?
however I have solved it in another way: using one javascript in each frame and with the help of mayscript, like:

some of the Form_frame:
function sendIt()
{
var theText=document.theForm.theName.value;
parent.applet_frame.aScriptFunction(theText);
}
<form action=&quot;javascript:sendIt();&quot; method=&quot;get&quot; name=&quot;Login&quot;>
<input type=&quot;text&quot; value=&quot;&quot; name=&quot;theName&quot; align=&quot;center&quot; maxlength=&quot;25&quot; size=&quot;40&quot;>
</form>


and then some frome the Applet_frame:
function aScriptFunction(aText)
{
document.theApplet.aFunction(aText);

}
<applet code=&quot;theApplet.class&quot; name=&quot;theApplet&quot; mayscript=&quot;mayscript&quot; width=&quot;250&quot; height=&quot;40&quot;>
</applet>

and the Applet:
public void aFunction(String someText)
{
System.out.println(&quot;Applet: got text:&quot;+someText);
}

 
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