autocompletepage.java

Wicket一个开发Java Web应用程序框架。它使得开发web应用程序变得容易而轻松。 Wicket利用一个POJO data beans组件使得它可以与任何持久层技术相结合。

/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.apache.wicket.examples.ajax.builtin;

import java.util.ArrayList;
import java.util.Collections;
import java.util.Iterator;
import java.util.List;
import java.util.Locale;

import org.apache.wicket.ajax.AjaxRequestTarget;
import org.apache.wicket.ajax.form.AjaxFormSubmitBehavior;
import org.apache.wicket.extensions.ajax.markup.html.autocomplete.AutoCompleteTextField;
import org.apache.wicket.markup.html.basic.Label;
import org.apache.wicket.markup.html.form.Form;
import org.apache.wicket.model.Model;
import org.apache.wicket.util.string.Strings;


/**
 * Page that demos the ajax auto complete text field
 * 
 * @author ivaynberg
 */
public class AutoCompletePage extends BasePage
{
	/**
	 * Constructor
	 */
	public AutoCompletePage()
	{
		Form form = new Form("form");
		add(form);

		final AutoCompleteTextField field = new AutoCompleteTextField("ac", new Model(""))
		{
			protected Iterator getChoices(String input)
			{
				if (Strings.isEmpty(input))
				{
					return Collections.EMPTY_LIST.iterator();
				}

				List choices = new ArrayList(10);

				Locale[] locales = Locale.getAvailableLocales();

				for (int i = 0; i < locales.length; i++)
				{
					final Locale locale = locales[i];
					final String country = locale.getDisplayCountry();

					if (country.toUpperCase().startsWith(input.toUpperCase()))
					{
						choices.add(country);
						if (choices.size() == 10)
						{
							break;
						}
					}
				}

				return choices.iterator();
			}
		};
		form.add(field);

		final Label label = new Label("selectedValue", field.getModel());
		label.setOutputMarkupId(true);
		form.add(label);

		field.add(new AjaxFormSubmitBehavior(form, "onchange")
		{
			protected void onSubmit(AjaxRequestTarget target)
			{
				target.addComponent(label);
			}

			@Override
			protected void onError(AjaxRequestTarget target)
			{
			}
		});
	}
}