Demo Choice Applet : Applet « Swing JFC « Java

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Java » Swing JFC » AppletScreenshots 
Demo Choice Applet
   
/*
 * Copyright (c) Ian F. Darwin, http://www.darwinsys.com/, 1996-2002.
 * All rights reserved. Software written by Ian F. Darwin and others.
 * $Id: LICENSE,v 1.8 2004/02/09 03:33:38 ian Exp $
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS''
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS
 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 
 * Java, the Duke mascot, and all variants of Sun's Java "steaming coffee
 * cup" logo are trademarks of Sun Microsystems. Sun's, and James Gosling's,
 * pioneering role in inventing and promulgating (and standardizing) the Java 
 * language and environment is gratefully acknowledged.
 
 * The pioneering role of Dennis Ritchie and Bjarne Stroustrup, of AT&T, for
 * inventing predecessor languages C and C++ is also gratefully acknowledged.
 */

////

//applet.html

/*
<TITLE>Ian Darwin's Demo Choice Applet</TITLE>
<BODY BGCOLOR="#c0e0d0">
<H1>Ian Darwin's Demo Choice Applet</H1>
<TABLE>
<TR><TD WIDTH=20%>
<P>Here it is, just what you need to replace JavaScript with:
<TD><!-- Need to adjust the height if you add more choices -->
<APPLET CODE=SumUp WIDTH=250 HEIGHT=150>
</APPLET>
</TABLE>
<HR>
<P>Hey, we'll even show you <A HREF="SumUp.java">how it works</A>.


*/


import java.applet.Applet;
import java.awt.Button;
import java.awt.Choice;
import java.awt.Color;
import java.awt.GridLayout;
import java.awt.Label;
import java.awt.Panel;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.net.URL;

/**
 * <p>
 * SumUp is a simple applet that adds up some numbers. To make this really
 * useful for production, should implement a "little language" either in HTML
 * PARAMs, such as
 
 * <pre>
 
 *   &amp;ltparam name=&quot;title1&quot; value=&quot;Option One&quot;&gt;
 *   &amp;ltparam name=&quot;values1&quot; value=&quot;0|100|200|300|400&quot;&gt;
 *   &amp;ltparam name=&quot;title1&quot; value=&quot;Option Two&quot;&gt;
 *   &amp;ltparam name=&quot;values1&quot; value=&quot;0|400|600|800|1000&quot;&gt;
 *  
 * </pre>
 
 * <br/>or <br/>in a configuration file which we download and parse (see
 * TreeLink.java in this directory) or load as a Properties file (see
 * MenuIntl.java).
 * </p>
 * <p>
 * Also, of course, the URL to go to should be a PARAM. Not to mention the
 * colors (see ColorName and/or XColor).
 * </p>
 
 @author Ian F. Darwin, http://www.darwinsys.com/
 */
public class SumUp extends Applet implements ActionListener {
  /** The array of Choice items */
  protected Choice cs[] new Choice[10];

  /** How many are actually in the array. */
  protected int numChoices = 0;

  /** The result of the summation */
  protected Label resultField;

  /** The pushbutton to send the form in */
  protected Button sendButton;

  /** init() is an Applet method called by the browser to initialize */
  public void init() {
    setBackground(Color.magenta);
    // The layout of the Applet is a Grid; always add things in pairs!
    setLayout(new GridLayout(02));
    Choice c;
    add(new Label("Option 1"));
    add(c = new Choice());
    c.addItem("0");
    c.addItem("100");
    c.addItem("200");
    c.addItem("400");
    cs[numChoices++= c;

    add(new Label("Option 2"));
    add(c = new Choice());
    c.addItem("0");
    c.addItem("100");
    c.addItem("200");
    c.addItem("400");
    cs[numChoices++= c;

    Panel p = new Panel();
    p.setBackground(Color.pink);
    p.add(new Label("Total:"));
    p.add(resultField = new Label("000000"));
    add(p);

    sendButton = new Button("Send it");
    add(sendButton)// connect Button into Applet
    sendButton.addActionListener(this)// connect it back to Applet
  }

  /**
   * actionPerforformed() is called when a "high level" action happens (like
   * the user pushing a Button!) in one of the components added to this
   * Applet.
   */
  public void actionPerformed(ActionEvent e) { // 1.1
    int total = 0;
    for (int i = 0; i < numChoices; i++) {
      String text = cs[i].getSelectedItem();
      // System.err.println("Selection " + i + " = " + text);
      int value = Integer.parseInt(text);
      total += value;
    }
    resultField.setText(Integer.toString(total));

    try {
      URL myNewURL = new URL("http://server/cgi-bin/credit?sum=" + total);

      // System.out.println("URL = " + myNewURL); // debug...

      // "And then a miracle occurs..."
      getAppletContext().showDocument(myNewURL);

    catch (Exception err) {
      System.err.println("Error!\n" + err);
      showStatus("Error, look in Java Console for details!");
    }
  }
}

           
         
    
    
  
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