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 org.apache.wicket.ajax.markup.html; import org.apache.wicket.Component; import org.apache.wicket.IGenericComponent; import org.apache.wicket.ajax.AjaxEventBehavior; import org.apache.wicket.ajax.AjaxRequestTarget; import org.apache.wicket.ajax.attributes.AjaxRequestAttributes; import org.apache.wicket.markup.ComponentTag; import org.apache.wicket.markup.html.link.AbstractLink; import org.apache.wicket.model.IModel; /** * A component that allows a trigger request to be triggered via html anchor tag * * @since 1.2 * * @author Igor Vaynberg (ivaynberg) * @param <T> * type of model object * */ public abstract class AjaxLink<T> extends AbstractLink implements IAjaxLink, IGenericComponent<T, AjaxLink<T>> { private static final long serialVersionUID = 1L; /** * Construct. * * @param id */ public AjaxLink(final String id) { this(id, null); } /** * Construct. * * @param id * @param model */ public AjaxLink(final String id, final IModel<T> model) { super(id, model); } @Override protected void onInitialize() { super.onInitialize(); add(newAjaxEventBehavior("click")); } /** * @param event * the name of the default event on which this link will listen to * @return the ajax behavior which will be executed when the user clicks the link */ protected AjaxEventBehavior newAjaxEventBehavior(String event) { return new AjaxEventBehavior(event) { private static final long serialVersionUID = 1L; @Override protected void onEvent(AjaxRequestTarget target) { onClick(target); } @Override protected void updateAjaxAttributes(AjaxRequestAttributes attributes) { super.updateAjaxAttributes(attributes); AjaxLink.this.updateAjaxAttributes(attributes); } @Override public boolean getStatelessHint(Component component) { return AjaxLink.this.getStatelessHint(); } }; } protected void updateAjaxAttributes(AjaxRequestAttributes attributes) { } @Override protected void onComponentTag(ComponentTag tag) { super.onComponentTag(tag); if (isEnabledInHierarchy()) { String tagName = tag.getName(); if (tagName.equalsIgnoreCase("a") || tagName.equalsIgnoreCase("link") || tagName.equalsIgnoreCase("area")) { // disable any href attr in markup tag.put("href", "javascript:;"); } else if (tagName.equalsIgnoreCase("button")) { // WICKET-5597 prevent submit tag.put("type", "button"); } } else { disableLink(tag); } } /** * Listener method invoked on the ajax request generated when the user clicks the link * * @param target */ @Override public abstract void onClick(final AjaxRequestTarget target); @Override protected boolean getStatelessHint() { return false; } }