/*
* 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;
import org.apache.wicket.Component;
import org.apache.wicket.ajax.attributes.AjaxCallListener;
import org.apache.wicket.ajax.attributes.AjaxRequestAttributes;
import org.apache.wicket.markup.html.form.TextField;
/**
* <p>
* An Ajax behavior that could be used to prevent the form submit
* when the user presses the <em>ENTER</em> key while in an HTML
* <input type="text" > field.
* </p>
* <p>
* The behavior could be applied to a {@link TextField} or to a parent
* container that will apply this behavior to all children of type HTMLInputElement.
* </p>
* <p>
* This Ajax behavior is client-side only, i.e. it never fires an Ajax call to the server.
* </p>
*/
public class AjaxPreventSubmitBehavior extends AjaxEventBehavior {
/**
* Constructor.
*/
public AjaxPreventSubmitBehavior() {
super("keydown");
}
@Override
protected void updateAjaxAttributes(final AjaxRequestAttributes attributes) {
super.updateAjaxAttributes(attributes);
Component component = getComponent();
if (component instanceof TextField<?> == false)
{
attributes.setChildSelector("input");
}
AjaxCallListener listener = new AjaxCallListener();
listener.onPrecondition("if (Wicket.Event.keyCode(attrs.event) === 13) {attrs.event.preventDefault();} return false;");
attributes.getAjaxCallListeners().add(listener);
}
@Override
protected final void onEvent(final AjaxRequestTarget target) {
// never called
}
}