Applet - Browser Display

Ranch Hand

Posts: 1026

posted 20 years ago

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I had written two applets and made them to communicate among each other. But
my problem is, on the click of the button in the html page the first applet goes invisible and the second applet should display. I had added an label to be displayed in the second label. But the label is not displaying. Some
one please help on this display issue.

import java.awt.*;
import java.awt.event.*;
import java.applet.*;
import java.net.*;
 
public class AppletCommunication extends Applet implements ActionListener{
String msg = " ",msg1 = " ", userid = "", password = "";
Button submit;
TextField UserID, Password;
Label label1, label2;
Panel panel1,panel2,panel3;
GridLayout gridlayout;
AppletCommunication2 theOtherApplet;
AppletContext ac;
 
public void init() {
 
final int n = 2;
setFont(new Font("Dialog",Font.PLAIN,16));
gridlayout = new GridLayout(n,n);
panel1 = new Panel();
panel2 = new Panel();
panel3 = new Panel();
panel1.setLayout(gridlayout);
label1 = new Label("User ID: ");
label2 = new Label("Password: ");
label1.setForeground(Color.white);
label2.setForeground(Color.white);
label1.setBackground(Color.black);
label2.setBackground(Color.black);
 
panel2.add(label1);
panel3.add(label2);
UserID = new TextField(10);
Password = new TextField(10);
 
panel2.add(UserID);
panel3.add(Password);
 
panel1.add(panel2);
panel1.add(panel3);
 
add(panel1);
 
submit = new Button("SUBMIT");
add(submit);
submit.addActionListener(this);
 
setBackground(Color.black);
setForeground(Color.white);
 
ac = getAppletContext();
theOtherApplet = (AppletCommunication2)ac.getApplet("AppCom2");
System.out.println(theOtherApplet);
 
}
 
public void actionPerformed(ActionEvent ae) {
String s1 = (String)ae.getActionCommand();
if(s1.equals("SUBMIT")) {
if(UserID.getText().equals(userid) && Password.getText().equals(password)){
 
          setVisible(false);
 
theOtherApplet.setFont(new Font("Dialog",Font.PLAIN,16));
theOtherApplet.label1 = new Label("Authentication Completed",Label.LEFT);
theOtherApplet.setForeground(Color.white);
theOtherApplet.setBackground(Color.black);
theOtherApplet.add(theOtherApplet.label1);
theOtherApplet.msg = "Authentication Completed";
theOtherApplet.init();
theOtherApplet.repaint();
 
msg = "Authentication Completed ";
}else {
msg = "Please verify UserID/Password ";
}
}
//repaint();
}
 
public void paint(Graphics g) {
  g.drawString(msg, 300, 200);
showStatus(msg);
}
 
}

import java.awt.*;
import java.awt.event.*;
import java.applet.*;

public class AppletCommunication2 extends Applet {
String msg = "";
Label label1;
public void init() {
repaint();
}

public void paint(Graphics g) {
g.drawString(msg, 300, 200);
showStatus(msg);
}
}

Servlet Spec 2.4/ Jsp Spec 2.0/ JSTL Spec 1.1 - JSTL Tag Documentation

Ben Fischer

Greenhorn

Posts: 7

posted 20 years ago

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Technically I think you're not supposed to be able to do that. When an applet loses visibility it's supposed to stop. Even when an applet scrolls outside the visible portion of the web page it is supposed to be stopped, but every browser I tried will in fact let it keep running.

I can get your applet to work if i comment out the setVisible(false) line. Perhaps you could move it to the point after where you wake up the other applet, or you could just erase the contents of the original applet. Or you could replace the original applet with whatever you intended the 2nd applet to do.

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