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.protocol.http;
018
019import java.util.Map;
020
021import org.apache.wicket.Component;
022import org.apache.wicket.ajax.AjaxRequestTarget;
023import org.apache.wicket.markup.html.form.Form;
024import org.apache.wicket.markup.html.form.FormComponent;
025import org.apache.wicket.util.visit.IVisitor;
026
027/**
028 * This listener updates the {@link Form}'s <em>enctype</em> whenever a multipart {@link FormComponent}
029 * is added to the {@code AjaxRequestTarget}.
030 * This is needed because the multipart form component may change its visibility/enablement and thus
031 * change the multipart-ness of the whole form.
032 */
033public class MultipartFormComponentListener implements AjaxRequestTarget.IListener
034{
035        static final String ENCTYPE_URL_ENCODED = "application/x-www-form-urlencoded";
036
037        @Override
038        public void onAfterRespond(final Map<String, Component> map, final AjaxRequestTarget target)
039        {
040                target.getPage().visitChildren(Form.class, (IVisitor<Form<?>, Void>) (form, formVisitor) -> {
041                        if (form.isVisibleInHierarchy()) {
042                                form.visitFormComponents((formComponent, visit) -> {
043                                        if (formComponent.isMultiPart()) {
044                                                String enctype = form.isMultiPart() ? Form.ENCTYPE_MULTIPART_FORM_DATA : ENCTYPE_URL_ENCODED;
045                                                target.appendJavaScript(String.format("Wicket.$('%s').enctype='%s'", form.getMarkupId(), enctype));
046                                                visit.stop();
047                                        }
048                                });
049                        } else {
050                                formVisitor.dontGoDeeper();
051                        }
052                });
053        }
054}