/*
* 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.ajax.AjaxEventBehavior;
import org.apache.wicket.ajax.AjaxRequestTarget;
import org.apache.wicket.ajax.IAjaxCallDecorator;
import org.apache.wicket.ajax.calldecorator.CancelEventIfNoAjaxDecorator;
import org.apache.wicket.markup.ComponentTag;
import org.apache.wicket.markup.html.link.Link;
import org.apache.wicket.model.IModel;
/**
* An ajax link that will degrade to a normal request if ajax is not available or javascript is
* disabled
*
* @since 1.2
*
* @author Igor Vaynberg (ivaynberg)
*
*/
public abstract class AjaxFallbackLink extends Link implements IAjaxLink
{
/** */
private static final long serialVersionUID = 1L;
/**
* Construct.
*
* @param id
*/
public AjaxFallbackLink(final String id)
{
this(id, null);
}
/**
* Construct.
*
* @param id
* @param model
*/
public AjaxFallbackLink(final String id, final IModel model)
{
super(id, model);
add(new AjaxEventBehavior("onclick")
{
private static final long serialVersionUID = 1L;
protected void onEvent(AjaxRequestTarget target)
{
onClick(target);
}
protected IAjaxCallDecorator getAjaxCallDecorator()
{
return new CancelEventIfNoAjaxDecorator(AjaxFallbackLink.this
.getAjaxCallDecorator());
}
protected void onComponentTag(ComponentTag tag)
{
// only render handler if link is enabled
if (isLinkEnabled())
{
super.onComponentTag(tag);
}
}
});
}
protected IAjaxCallDecorator getAjaxCallDecorator()
{
return null;
}
/**
*
* @see org.apache.wicket.markup.html.link.Link#onClick()
*/
public final void onClick()
{
onClick(null);
}
/**
* Callback for the onClick event. If ajax failed and this event was generated via a normal link
* the target argument will be null
*
* @param target
* ajax target if this linked was invoked using ajax, null otherwise
*/
public abstract void onClick(final AjaxRequestTarget target);
}