Java tutorial
/* * 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 by.parfen.disptaxi.webapp.etc; import java.util.ArrayList; import java.util.Collections; import java.util.HashMap; import java.util.Iterator; import java.util.List; import java.util.Map; import javax.inject.Inject; import org.apache.wicket.ajax.AjaxRequestTarget; import org.apache.wicket.ajax.form.AjaxFormComponentUpdatingBehavior; import org.apache.wicket.ajax.form.AjaxFormSubmitBehavior; import org.apache.wicket.ajax.markup.html.form.AjaxButton; 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.DropDownChoice; import org.apache.wicket.markup.html.form.Form; import org.apache.wicket.markup.html.panel.FeedbackPanel; import org.apache.wicket.model.AbstractReadOnlyModel; import org.apache.wicket.model.IModel; import org.apache.wicket.model.Model; import org.apache.wicket.model.PropertyModel; import org.apache.wicket.util.string.Strings; import by.parfen.disptaxi.datamodel.City; import by.parfen.disptaxi.datamodel.Point; import by.parfen.disptaxi.datamodel.Street; import by.parfen.disptaxi.services.CityService; import by.parfen.disptaxi.services.PointService; import by.parfen.disptaxi.services.StreetService; import by.parfen.disptaxi.webapp.BaseLayout; public class ChoicePage extends BaseLayout { private String selectedStreetName; private Street selectedStreet; @Inject private CityService cityService; @Inject private StreetService streetService; @Inject private PointService pointService; private final Map<String, List<String>> pointsMap = new HashMap<String, List<String>>(); // map:F1->F2 public void setSelectedStreet(Street selectedStreet) { this.selectedStreet = selectedStreet; } /** * Constructor. */ public ChoicePage() { final City city = cityService.get(15L); List<Street> streetsList; streetsList = streetService.getAllByCity(city); for (Street streetItem : streetsList) { List<Point> pointsList = pointService.getAllByStreet(streetItem); List<String> pointNames = new ArrayList<String>(); for (Point pointItem : pointsList) { pointNames.add(pointItem.getName()); } pointsMap.put(streetItem.getName(), pointNames); } // pointsMap.put("", Arrays.asList("12", "22", "34")); // pointsMap.put("", Arrays.asList("2", "4", "45", "13", "78")); // pointsMap.put("", Arrays.asList("10", "12", "22", "4", "6")); IModel<List<? extends String>> makeChoices = new AbstractReadOnlyModel<List<? extends String>>() { @Override public List<String> getObject() { return new ArrayList<String>(pointsMap.keySet()); } }; IModel<List<? extends String>> modelChoices = new AbstractReadOnlyModel<List<? extends String>>() { @Override public List<String> getObject() { List<String> points = pointsMap.get(selectedStreetName); if (points == null) { points = Collections.emptyList(); } return points; } }; Form<Void> form = new Form<Void>("form"); add(form); final DropDownChoice<String> streets = new DropDownChoice<String>("streets", new PropertyModel<String>(this, "selectedStreetName"), makeChoices); final DropDownChoice<String> points = new DropDownChoice<String>("points", new Model<String>(), modelChoices); points.setOutputMarkupId(true); form.add(streets); form.add(points); final FeedbackPanel feedback = new FeedbackPanel("feedback"); feedback.setOutputMarkupId(true); add(feedback); form.add(new AjaxButton("go") { @Override protected void onAfterSubmit(AjaxRequestTarget target, Form<?> form) { super.onAfterSubmit(target, form); info(" : " + streets.getModelObject() + " " + points.getModelObject()); target.add(feedback); } }); streets.add(new AjaxFormComponentUpdatingBehavior("change") { @Override protected void onUpdate(AjaxRequestTarget target) { target.add(points); } }); Form<Void> ajaxForm = new Form<Void>("ajaxForm"); add(ajaxForm); final AutoCompleteTextField<String> field = new AutoCompleteTextField<String>("ac", new Model<String>("")) { @Override protected Iterator<String> getChoices(String input) { if (Strings.isEmpty(input)) { List<String> emptyList = Collections.emptyList(); return emptyList.iterator(); } List<String> choices = new ArrayList<String>(10); List<Street> streetsList = streetService.getAllByCity(city); for (final Street streetItem : streetsList) { final String streetName = streetItem.getName(); if (streetName.toUpperCase().startsWith(input.toUpperCase())) { choices.add(streetName); if (choices.size() == 10) { break; } } } return choices.iterator(); } }; ajaxForm.add(field); final Label label = new Label("selectedValue", field.getDefaultModel()); label.setOutputMarkupId(true); ajaxForm.add(label); field.add(new AjaxFormSubmitBehavior(ajaxForm, "onchange") { @Override protected void onSubmit(AjaxRequestTarget target) { target.add(label); List<Street> streetList = streetService.getAllByCityAndName(city, label.getDefaultModelObjectAsString()); if (streetList.size() == 1) { setSelectedStreet(streetList.get(0)); } } @Override protected void onError(AjaxRequestTarget target) { } }); } }