Java/GWT/RootPanel

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Add two controls to RootPanel

   <source lang="java">

package com.jexp.gwt.client;

import com.google.gwt.core.client.*; import com.google.gwt.user.client.ui.*; public class GWTClient implements EntryPoint{

  public void onModuleLoad() {
     final Button button = new Button("Click me");
     final Label label = new Label();
     
     button.addClickListener(new ClickListener() {
        public void onClick(Widget sender) {
           if (label.getText().equals(""))
              label.setText("Hello World!");
           else
              label.setText("");
        }
     });
     
     RootPanel.get("slot1").add(button);
     RootPanel.get("slot2").add(label);
     
  }
  

}

      </source>
   
  
 
  



Use RootPanel to Load New Page

   <source lang="java">

package com.jexp.gwt.client; import com.google.gwt.core.client.EntryPoint; import com.google.gwt.core.client.GWT; import com.google.gwt.user.client.Window; import com.google.gwt.user.client.ui.Button; import com.google.gwt.user.client.ui.ClickListener; import com.google.gwt.user.client.ui.Grid; import com.google.gwt.user.client.ui.Label; import com.google.gwt.user.client.ui.PasswordTextBox; import com.google.gwt.user.client.ui.RootPanel; import com.google.gwt.user.client.ui.TextBox; import com.google.gwt.user.client.ui.Widget; public class GWTClient implements EntryPoint{

 public void onModuleLoad() {
   loadLoginView();
 }
 private void loadLoginView() {
   final Label loginPrompt = new Label("login");
   final Grid grid = new Grid(3, 2);
   final Label namePrompt = new Label("name");
   final TextBox nameTextbox = new TextBox();
   final Label passwordPrompt = new Label("password");
   final PasswordTextBox passwordTextbox = new PasswordTextBox();
   final Button button = new Button("Login");
   button.addClickListener(new ClickListener() {
     public void onClick(Widget sender) {
       loadWelcomeView();
     }
   });
   button.addClickListener(new ClickListener() {
     public void onClick(Widget sender) {
       Window.alert("New page loaded");
     }
   });
   loginPrompt.addStyleName("loginPrompt");
   nameTextbox.addStyleName("nameField");
   passwordTextbox.addStyleName("passwordField");
   grid.setWidget(0, 0, namePrompt);
   grid.setWidget(0, 1, nameTextbox);
   grid.setWidget(1, 0, passwordPrompt);
   grid.setWidget(1, 1, passwordTextbox);
   grid.setWidget(2, 1, button);
   
   RootPanel.get().clear();
   RootPanel.get().add(loginPrompt);
   RootPanel.get().add(grid);
 }
 private void loadWelcomeView() {
   final Label welcomeMsg = new Label("welcome");
   welcomeMsg.addStyleName("welcomeMsg");
   RootPanel.get().clear();
   RootPanel.get().add(welcomeMsg);
 }

}

      </source>