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'''Note:''' During development, first run the project to bring up the shell. From that point on, it is not necessary to re-run the project on any changes. After making changes to the html or java files, just do a build (or even quicker--save all files) and reload in the GWT browser window.
'''Note:''' During development, first run the project to bring up the shell. From that point on, it is not necessary to re-run the project on any changes. After making changes to the html or java files, just do a build (or even quicker--save all files) and reload in the GWT browser window.
For more information: [[media:gwt-tutorial-2.tar.gz|GWT Tutorial 2]]

Latest revision as of 23:00, 11 September 2008

Creating a GWT Module

Hello world now done in GWT style. Instead of a static 'Hello World' page, a button will be placed on the web page that will display 'Hello World' when clicked.

Create a package under the root package called client. In that package, create a Java class named ModuleNameApp (e.g., HelloWorldApp.java). Put in the following code:

package edu.umiacs.gwt.hello.client;

import com.google.gwt.core.client.EntryPoint;
import com.google.gwt.core.client.GWT;
import com.google.gwt.user.client.ui.Button;
import com.google.gwt.user.client.ui.ClickListener;
import com.google.gwt.user.client.ui.Label;
import com.google.gwt.user.client.ui.RootPanel;
import com.google.gwt.user.client.ui.VerticalPanel;
import com.google.gwt.user.client.ui.Widget;

public class HelloWorldApp implements EntryPoint
{
    public void onModuleLoad()
    {
        GWT.log("onModuleLoad()", null);
        
        final Label lblSayHello = new Label();
        Button btnAsk = new Button("Say something");
        btnAsk.addClickListener(new ClickListener()
        {
            public void onClick(Widget w)
            {
                lblSayHello.setText("Hello world!");
            }
        });
        
        VerticalPanel vp = new VerticalPanel();
        vp.add(btnAsk);
        vp.add(lblSayHello);
        
        RootPanel root = RootPanel.get("div1");
        root.add(vp);
    }
    
}

Now modify the ModuleName.gwt.xml file (e.g., HelloWorld.gwt.xml) so that it now looks like this:

<?xml version="1.0" encoding="UTF-8"?>
<module>
   <inherits name="com.google.gwt.user.User"/>      
   <entry-point class="edu.umiacs.gwt.hello.client.HelloWorldApp"/>        
</module>

The entry-point element should specify the fully qualified path to the class which implements EntryPoint. Now place the necessary information in the ModuleName.html file (e.g., =HelloWorld.html=). It should now contain the following:

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">

<html>
  <head>
    <title></title>
    <meta name='gwt:module' content='edu.umiacs.gwt.hello.HelloWorld'>
  </head>
  <body>
     <script language="javascript" src="gwt.js"></script>        
     <div id="div1"></div> 
  </body>
</html>

Run the project and click away!

Note: During development, first run the project to bring up the shell. From that point on, it is not necessary to re-run the project on any changes. After making changes to the html or java files, just do a build (or even quicker--save all files) and reload in the GWT browser window.

For more information: GWT Tutorial 2