The problem is the if statement check:
document.CityChoice.City[0].checked == true
This is not exactly how it goes with JavaScript since the wrong expression you have there throws an error and it never makes it into the if statement body.
I removed the if statement and changed the code to something like this:
function selectedCity()
{
document.SimpleMessageApplet.setMessage("Hello");
}
When I click I see the Hello message fine.
Change your HTML file content to something like:
<html><head><meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>Insert title here</title>
<SCRIPT LANGUAGE="JavaScript">
function selectedCity()
{
var elem = document.getElementById('cityRb');
if(elem.checked)
{
document.SimpleMessageApplet.setMessage(elem.value);
}
}
</SCRIPT></HEAD>
<BODY >
<b>This is the Applet</b>
<APPLET CODE="MessageApplet.class" NAME="SimpleMessageApplet" WIDTH=350 HEIGHT=100 >
</APPLET >
<FORM NAME="CityChoice">
<input type="radio" id="cityRb" name="City" value="Boston" onClick="selectedCity()"> Boston<br>
</form>
</BODY >
</html>
Also adding the full class code:
import java.applet.Applet;
import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Label;
/**
*
* @author hmmmmm
*/
public class MessageApplet extends Applet {
private Label m_mess;
public void init() {
setBackground(Color.lightGray);
setLayout(new BorderLayout());
m_mess = new Label("MessageApplet is Running...: No Selection Yet", Label.CENTER);
add(BorderLayout.CENTER, m_mess);
m_mess.setBackground(Color.red);
}
public void setMessage(String message) {
m_mess.setText("Selection: " + message);
}
}
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