259 lines
12 KiB
HTML
259 lines
12 KiB
HTML
<?xml version="1.0" encoding="UTF-8"?>
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<!DOCTYPE html
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PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
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<html lang="en-us" xml:lang="en-us">
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<head>
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<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
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<meta name="security" content="public" />
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<meta name="Robots" content="index,follow" />
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<meta http-equiv="PICS-Label" content='(PICS-1.1 "http://www.icra.org/ratingsv02.html" l gen true r (cz 1 lz 1 nz 1 oz 1 vz 1) "http://www.rsac.org/ratingsv01.html" l gen true r (n 0 s 0 v 0 l 0) "http://www.classify.org/safesurf/" l gen true r (SS~~000 1))' />
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<meta name="DC.Type" content="reference" />
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<meta name="DC.Title" content="Using the Graphical Toolbox in a browser" />
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<meta name="abstract" content="You can use the Graphical Toolbox to build panels for Java applets that run in a Web browser." />
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<meta name="description" content="You can use the Graphical Toolbox to build panels for Java applets that run in a Web browser." />
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<meta name="DC.Relation" scheme="URI" content="pdmlpg1.htm" />
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<meta name="copyright" content="(C) Copyright IBM Corporation 2006" />
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<meta name="DC.Rights.Owner" content="(C) Copyright IBM Corporation 2006" />
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<meta name="DC.Format" content="XHTML" />
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<meta name="DC.Identifier" content="pdmlbrws" />
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<meta name="DC.Language" content="en-us" />
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<!-- All rights reserved. Licensed Materials Property of IBM -->
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<!-- US Government Users Restricted Rights -->
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<!-- Use, duplication or disclosure restricted by -->
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<!-- GSA ADP Schedule Contract with IBM Corp. -->
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<link rel="stylesheet" type="text/css" href="./ibmdita.css" />
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<link rel="stylesheet" type="text/css" href="./ic.css" />
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<title>Using the Graphical Toolbox in a browser</title>
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</head>
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<body id="pdmlbrws"><a name="pdmlbrws"><!-- --></a>
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<!-- Java sync-link --><script language="Javascript" src="../rzahg/synch.js" type="text/javascript"></script>
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<h1 class="topictitle1">Using the Graphical Toolbox in a browser</h1>
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<div><p>You can use the Graphical Toolbox to build panels for Java™ applets
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that run in a Web browser. </p>
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<div class="section"><p>This section describes how to convert the simple panel from the <a href="pdmlcdex.htm#pdmlcdex">Graphical Toolbox Example</a> to run in a
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browser. The minimum browser levels supported are Netscape 4.05 and Internet
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Explorer 4.0. In order to avoid having to deal with the idiosyncrasies of
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individual browsers, it is recommend that your applets run using Sun's Java Plug-in.
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Otherwise, you will need to construct signed JAR files for Netscape, and separate
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signed CAB files for Internet Explorer.</p>
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<div class="note"><span class="notetitle">Note:</span> Read the <a href="codedisclaimer.htm#codedisclaimer">Code
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example disclaimer</a> for important legal information.</div>
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</div>
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<div class="section"><h4 class="sectiontitle">Constructing the applet</h4><p>The code to display a panel
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in an applet is nearly identical to the code used in the Java application
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example, but first, the code must be repackaged in the <strong><span>init</span></strong> method
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of a <strong>JApplet</strong> subclass. Also, some code was added to ensure that the
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applet panel is sized to the dimensions specified in the panel's PDML definition.
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Here is the source code for the example applet, <strong>SampleApplet.java</strong>.</p>
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<pre>import com.ibm.as400.ui.framework.java.*;
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import javax.swing.*;
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import java.awt.*;
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import java.applet.*;
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import java.util.*;
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public class SampleApplet extends JApplet
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{
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// The following are needed to maintain the panel's size
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private PanelManager m_pm;
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private Dimension m_panelSize;
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// Define an exception to throw in case something goes wrong
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class SampleAppletException extends RuntimeException {}
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public void init()
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{
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System.out.println("In init!");
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// Trace applet parameters
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System.out.println("SampleApplet code base=" + getCodeBase());
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System.out.println("SampleApplet document base=" + getDocumentBase());
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// Do a check to make sure we're running a Java virtual machine that's compatible with Swing 1.1
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if (System.getProperty("java.version").compareTo("1.1.5") < 0)
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throw new IllegalStateException("SampleApplet cannot run on Java VM version " +
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System.getProperty("java.version") +
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" - requires 1.1.5 or higher");
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// Instantiate the bean object that supplies data to the panel
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SampleBean bean = new SampleBean();
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// Initialize the object
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bean.load();
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// Set up to pass the bean to the panel manager
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DataBean[] beans = { bean };
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// Update the status bar
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showStatus("Loading the panel definition...");
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// Create the panel manager. Parameters:
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// 1. PDML file as a resource name
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// 2. Name of panel to display
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// 3. List of data objects that supply panel data
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// 4. The content pane of the applet
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try { m_pm = new PanelManager("MyGUI", "PANEL_1", beans, getContentPane()); }
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catch (DisplayManagerException e)
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{
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// Something didn't work, so display a message and exit
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e.displayUserMessage(null);
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throw new SampleAppletException();
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}
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// Identify the directory where the online help resides
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m_pm.setHelpPath("http://MyDomain/MyDirectory/");
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// Display the panel
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m_pm.setVisible(true);
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}
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public void start()
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{
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System.out.println("In start!");
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// Size the panel to its predefined size
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m_panelSize = m_pm.getPreferredSize();
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if (m_panelSize != null)
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{
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System.out.println("Resizing to " + m_panelSize);
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resize(m_panelSize);
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}
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else
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System.err.println("Error: getPreferredSize returned null");
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}
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public void stop()
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{
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System.out.println("In stop!");
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}
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public void destroy()
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{
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System.out.println("In destroy!");
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}
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public void paint(Graphics g)
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{
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// Call the parent first
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super.paint(g);
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// Preserve the panel's predefined size on a repaint
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if (m_panelSize != null)
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resize(m_panelSize);
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}
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}</pre>
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<p>The applet's content pane is passed to the Graphical Toolbox
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as the container to be laid out. In the <strong>start</strong> method, the applet pane
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is set to its correct size, and then override the <strong>paint</strong> method in order
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to preserve the panel's size when the browser window is resized.</p>
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<p>When
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running the Graphical Toolbox in a browser, the HTML files for your panel's
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online help cannot be accessed from a JAR file. They must reside as separate
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files in the directory where your applet resides. The call to <strong><span>PanelManager.setHelpPath</span></strong> identifies
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this directory to the Graphical Toolbox, so that your help files can be located.</p>
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</div>
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<div class="section"><h4 class="sectiontitle">HTML tags</h4><p>Because it is recommended to use Sun's Java Plug-in
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to provide the correct level of the Java runtime environment, the HTML for identifying
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a Graphical Toolbox applet is not as straightforward as preferred. Fortunately,
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the same HTML template may be reused, with only slight changes, for other
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applets. The markup is designed to be interpreted in both Netscape Navigator
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and Internet Explorer, and it generates a prompt for downloading the Java Plug-in
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from Sun's Web site if it's not already installed on the user's machine.
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For detailed information on the workings of the Java Plug-in see the <a href="http://java.sun.com/products/plugin/1.1.3/docs/tags.html" target="_blank">Java Plug-in
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HTML Specification</a>. <img src="www.gif" alt="Link outside Information Center" /> </p>
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<p>Here is the HTML for the sample applet,
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in the file <strong>MyGUI.html</strong>:</p>
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<pre><html>
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<head>
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<title>Graphical Toolbox Demo</title>
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</head>
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<body>
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<h1>Graphical Toolbox Demo Using Java(TM) Plug-in</h1>
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<p>
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<!-- BEGIN JAVA(TM) PLUG-IN APPLET TAGS -->
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<!-- The following tags use a special syntax which allows both Netscape and Internet Explorer to load -->
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<!-- the Java Plug-in and run the applet in the Plug-in's JRE. Do not modify this syntax. -->
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<!-- For more information see http://java.sun.com/products/jfc/tsc/swingdoc-current/java_plug_in.html.-->
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<OBJECT classid="clsid:8AD9C840-044E-11D1-B3E9-00805F499D93"
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width="400"
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height="200"
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align="left"
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codebase="http://java.sun.com/products/plugin/1.1.3/jinstall-113-win32.cab#Version=1,1,3,0">
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<PARAM name="code" value="SampleApplet">
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<PARAM name="codebase" value="http://www.mycompany.com/~auser/applets/">
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<PARAM name="archive" value="MyGUI.jar,jui400.jar,util400.jar,x4j400.jar">
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<PARAM name="type" value="application/x-java-applet;version=1.1">
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<COMMENT>
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<EMBED type="application/x-java-applet;version=1.1"
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width="400"
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height=200"
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align="left"
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code="SampleApplet"
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codebase="http://www.mycompany.com/~auser/applets/"
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archive="MyGUI.jar,jui400.jar,util400.jar,x4j400.jar"
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pluginspage="http://java.sun.com/products/plugin/1.1.3/plugin-install.html">
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<NOEMBED>
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</COMMENT>
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No support for JDK 1.1 applets found!
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</NOEMBED>
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</EMBED>
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</OBJECT>
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<!-- END JAVA(TM) PLUG-IN APPLET TAGS -->
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<p>
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</body>
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</html></pre>
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<p> It is important that the version information be
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set for 1.1.3. </p>
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<div class="note"><span class="notetitle">Note:</span> In this example, the XML parser JAR file, <strong>x4j400.jar</strong>,
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is stored on the Web server. You can use other XML parsers. For more information,
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see <a href="rzahhxmlparserxslprocessor.htm">XML parser and XSLT processor</a>.
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This is required only when you include your PDML file as part of your applet's
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installation. For performance reasons, you would normally <em>serialize</em> your
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panel definitions so that the Graphical Toolbox does not have to interpret
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the PDML at runtime. This greatly improves the performance of your user interface
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by creating compact binary representations of your panels. For more information
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see the description of <a href="pdmltool.htm#pdmltool__genf">files generated
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by the tools</a>.</div>
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</div>
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<div class="section"><h4 class="sectiontitle">Installing and running the applet</h4><p>Install the applet
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on your favorite Web server by performing the following steps: </p>
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<ol><li>Compile <strong>SampleApplet.java</strong>.</li>
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<li>Create a JAR file named <strong>MyGUI.jar</strong> to contain the applet binaries.
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These include the class files produced when you compiled <strong>SampleApplet.java</strong> and <strong>SampleBean.java</strong>,
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the PDML file <strong>MyGUI.pdml</strong>, and the resource bundle <strong>MyGUI.properties</strong>.</li>
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<li>Copy your new JAR file to a directory of your choice on your Web server.
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Copy the HTML files containing your online help into the server directory.</li>
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<li>Copy the Graphical Toolbox JAR files into the server directory.</li>
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<li>Finally, copy the HTML file <strong>MyGUI.html</strong> containing the embedded
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applet into the server directory.</li>
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</ol>
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<div class="tip"><span class="tiptitle">Tip:</span> When testing your applets, ensure that you have removed
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the Graphical Toolbox jars from the CLASSPATH environment variable on your
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workstation. Otherwise, you will see error messages saying that the resources
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for your applet cannot be located on the server.</div>
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<p>Now you are ready
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to run the applet. Point your Web browser to <strong>MyGUI.html</strong> on the server.
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If you do not already have the Java Plug-in installed, you will be asked
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if you want to install it. Once the Plug-in is installed and the applet is
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started, your browser display should look similar to the Figure 1:</p>
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<p><strong>Figure
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1: Running the sample applet in a browser</strong></p>
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<p><img src="rzahh100.gif" alt="Running the sample applet in a browser" /></p>
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</div>
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</div>
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<div>
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<div class="familylinks">
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<div class="parentlink"><strong>Parent topic:</strong> <a href="pdmlpg1.htm" title="The Graphical Toolbox, a set of UI tools, makes it easy to create custom user interface panels in Java.">Graphical Toolbox and PDML</a></div>
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</div>
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</div>
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</body>
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</html> |