GWT - DatePicker Widget

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Introduction

The DatePicker widget represents a standard GWT date picker.

Class Declaration

Following is the declaration for com.google.gwt.user.datepicker.client.DatePicker class −

public class DatePicker
   extends Composite
      implements HasHighlightHandlers<java.util.Date>,
	     HasShowRangeHandlers<java.util.Date>, HasValue<java.util.Date>

CSS Style Rules

Following default CSS Style rules will be applied to all the DatePicker widget. You can override it as per your requirements.

.gwt-DatePicker { }

.datePickerMonthSelector {  }

.datePickerMonth {  }

.datePickerPreviousButton {  }

.datePickerNextButton {  }

.datePickerDays {  }

.datePickerWeekdayLabel {  }

.datePickerWeekendLabel {  }

.datePickerDay {  }

.datePickerDayIsToday {  }

.datePickerDayIsWeekend { }

.datePickerDayIsFiller {  }

.datePickerDayIsValue {  }

.datePickerDayIsDisabled { }

.datePickerDayIsHighlighted {  }

.datePickerDayIsValueAndHighlighted { }

Class Constructors

Class Methods

Methods Inherited

This class inherits methods from the following classes −

• com.google.gwt.user.client.ui.UIObject

• com.google.gwt.user.client.ui.Widget

• com.google.gwt.user.client.ui.Composite

• java.lang.Object

DatePicker Widget Example

This example will take you through simple steps to show usage of a DatePicker Widget in GWT. Follow the following steps to update the GWT application we created in GWT - Create Application chapter −

Following is the content of the modified module descriptor src/com.tutorialspoint/HelloWorld.gwt.xml.

<?xml version = "1.0" encoding = "UTF-8"?>
<module rename-to = 'helloworld'>
   <!-- Inherit the core Web Toolkit stuff.                        -->
   <inherits name = 'com.google.gwt.user.User'/>

   <!-- Inherit the default GWT style sheet.                       -->
   <inherits name = 'com.google.gwt.user.theme.clean.Clean'/>

   <!-- Specify the app entry point class.                         -->
   <entry-point class = 'com.tutorialspoint.client.HelloWorld'/>

   <!-- Specify the paths for translatable code                    -->
   <source path = 'client'/>
   <source path = 'shared'/>

</module>

Following is the content of the modified Style Sheet file war/HelloWorld.css.

body {
   text-align: center;
   font-family: verdana, sans-serif;
}

h1 {
   font-size: 2em;
   font-weight: bold;
   color: #777777;
   margin: 40px 0px 70px;
   text-align: center;
}

.gwt-DatePicker {
   border: 1px solid #ccc;
   border-top:1px solid #999;
   cursor: default;
}

.gwt-DatePicker td,
.datePickerMonthSelector td:focus {
   outline: none;
}

.datePickerMonthSelector td:focus {
   outline: none;
}

.datePickerDays {
   width: 100%;
   background: white;
}

.datePickerDay,
.datePickerWeekdayLabel,
.datePickerWeekendLabel {
   font-size: 85%;
   text-align: center;
   padding: 4px;
   outline: none;
   font-weight:bold;
   color:#333;
   border-right: 1px solid #EDEDED;
   border-bottom: 1px solid #EDEDED;
}

.datePickerWeekdayLabel,
.datePickerWeekendLabel {
   background: #fff;
   padding: 0px 4px 2px;
   cursor: default;
   color:#666;
   font-size:70%;
   font-weight:normal;
}

.datePickerDay {
   padding: 4px 7px;
   cursor: hand;
   cursor: pointer;
}

.datePickerDayIsWeekend {
   background: #f7f7f7;
}

.datePickerDayIsFiller {
   color: #999;
   font-weight:normal;
}

.datePickerDayIsValue {
   background: #d7dfe8;
}

.datePickerDayIsDisabled {
   color: #AAAAAA;
   font-style: italic;
}

.datePickerDayIsHighlighted {
   background: #F0E68C;
}

.datePickerDayIsValueAndHighlighted {
   background: #d7dfe8;
}

.datePickerDayIsToday {
   padding: 3px;
   color: #00f;
   background: url(images/hborder.png) repeat-x 0px -2607px;
}

.datePickerMonthSelector {
   width: 100%;
   padding: 1px 0 5px 0;
   background: #fff;
}

.datePickerPreviousButton,
.datePickerNextButton {
   font-size: 120%;
   line-height: 1em;
   color: #3a6aad;
   cursor: hand;
   cursor: pointer;
   font-weight: bold;
   padding: 0px 4px;
   outline: none;
}

td.datePickerMonth {
   text-align: center;
   vertical-align: middle;
   white-space: nowrap;
   font-size: 100%;
   font-weight: bold;
   color: #333;
}

.gwt-DateBox {
   padding: 5px 4px;
   border: 1px solid #ccc;
   border-top: 1px solid #999;
   font-size: 100%;
}

.gwt-DateBox input {
   width: 8em;
}

.dateBoxFormatError {
   background: #ffcccc;
}

.dateBoxPopup {
}

Following is the content of the modified HTML host file war/HelloWorld.html.

<html>
   <head>
      <title>Hello World</title>
      <link rel = "stylesheet" href = "HelloWorld.css"/>
      <script language = "javascript" src = "helloworld/helloworld.nocache.js">
      </script>
   </head>

   <body>
      <h1>DatePicker Widget Demonstration</h1>
      <div id = "gwtContainer"></div>
   </body>
</html>

Let us have following content of Java file src/com.tutorialspoint/HelloWorld.java which will demonstrate use of Tree widget.

package com.tutorialspoint.client;

import java.util.Date;

import com.google.gwt.core.client.EntryPoint;
import com.google.gwt.event.logical.shared.ValueChangeEvent;
import com.google.gwt.event.logical.shared.ValueChangeHandler;
import com.google.gwt.i18n.client.DateTimeFormat;
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.datepicker.client.DateBox;
import com.google.gwt.user.datepicker.client.DatePicker;

public class HelloWorld implements EntryPoint {
   public void onModuleLoad() {
      // Create a basic date picker
      DatePicker datePicker = new DatePicker();
      final Label text = new Label();

      // Set the value in the text box when the user selects a date
      datePicker.addValueChangeHandler(new ValueChangeHandler<Date>() {
         @Override
         public void onValueChange(ValueChangeEvent<Date> event) {
            Date date = event.getValue();
            String dateString = 
            DateTimeFormat.getFormat("MM/dd/yyyy").format(date);
            text.setText(dateString);				
         }
      });
      
      // Set the default value
      datePicker.setValue(new Date(), true);

      // Create a DateBox
      DateTimeFormat dateFormat = DateTimeFormat.getFormat("MM/dd/yyyy");
      DateBox dateBox = new DateBox();
      dateBox.setFormat(new DateBox.DefaultFormat(dateFormat));

      Label selectLabel = new Label("Permanent DatePicker:");
      Label selectLabel2 = new Label("DateBox with popup DatePicker:");
      
      // Add widgets to the root panel.
      VerticalPanel vPanel = new VerticalPanel();
      vPanel.setSpacing(10);
      vPanel.add(selectLabel);
      vPanel.add(text);
      vPanel.add(datePicker);
      vPanel.add(selectLabel2);
      vPanel.add(dateBox);

      RootPanel.get("gwtContainer").add(vPanel);
   } 
}

Once you are ready with all the changes done, let us compile and run the application in development mode as we did in GWT - Create Application chapter. If everything is fine with your application, this will produce following result −