001/* 002 * Licensed to the Apache Software Foundation (ASF) under one or more 003 * contributor license agreements. See the NOTICE file distributed with 004 * this work for additional information regarding copyright ownership. 005 * The ASF licenses this file to You under the Apache License, Version 2.0 006 * (the "License"); you may not use this file except in compliance with 007 * the License. You may obtain a copy of the License at 008 * 009 * http://www.apache.org/licenses/LICENSE-2.0 010 * 011 * Unless required by applicable law or agreed to in writing, software 012 * distributed under the License is distributed on an "AS IS" BASIS, 013 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 014 * See the License for the specific language governing permissions and 015 * limitations under the License. 016 */ 017package org.apache.wicket.extensions.markup.html.form.select; 018 019import org.apache.wicket.Component; 020import org.apache.wicket.IGenericComponent; 021import org.apache.wicket.WicketRuntimeException; 022import org.apache.wicket.markup.ComponentTag; 023import org.apache.wicket.markup.html.WebMarkupContainer; 024import org.apache.wicket.model.IModel; 025 026/** 027 * Component representing a single <code><option></code> html element 028 * 029 * @see Select 030 * @param <T> 031 * 032 * @author Igor Vaynberg 033 */ 034public class SelectOption<T> extends WebMarkupContainer implements IGenericComponent<T, SelectOption<T>> 035{ 036 private static final long serialVersionUID = 1L; 037 038 /** 039 * page-scoped uuid of this option. this property must not be accessed directly, instead 040 * {@link #getValue()} must be used 041 */ 042 private int uuid = -1; 043 044 /** 045 * @see WebMarkupContainer#WebMarkupContainer(String) 046 */ 047 public SelectOption(final String id) 048 { 049 super(id); 050 } 051 052 /** 053 * @param id 054 * @param model 055 * @see WebMarkupContainer#WebMarkupContainer(String, IModel) 056 */ 057 public SelectOption(final String id, final IModel<T> model) 058 { 059 super(id, model); 060 } 061 062 /** 063 * Form submission value used for this select option. This string will appear as the value of 064 * the <code>value</code> html attribute for the <code>option</code> tag. 065 * 066 * @return form submission value 067 */ 068 public String getValue() 069 { 070 if (uuid < 0) 071 { 072 uuid = getPage().getAutoIndex(); 073 } 074 return "option" + uuid; 075 } 076 077 /** 078 * @see Component#onComponentTag(ComponentTag) 079 * @param tag 080 * the abstraction representing html tag of this component 081 */ 082 @Override 083 protected void onComponentTag(final ComponentTag tag) 084 { 085 // must be attached to <option .../> tag 086 checkComponentTag(tag, "option"); 087 088 Select<?> select = findParent(Select.class); 089 if (select == null) 090 { 091 throw new WicketRuntimeException( 092 "SelectOption component [" + 093 getPath() + 094 "] cannot find its parent Select. All SelectOption components must be a child of or below in the hierarchy of a Select component."); 095 } 096 097 final String uuid = getValue(); 098 099 // assign value 100 tag.put("value", uuid); 101 102 if (select.isSelected(this)) 103 { 104 tag.put("selected", "selected"); 105 } 106 107 // Default handling for component tag 108 super.onComponentTag(tag); 109 } 110}