// Copyright 2004, 2005 The Apache Software Foundation
//
// Licensed 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.tapestry.form;
import org.apache.tapestry.IForm;
import org.apache.tapestry.IMarkupWriter;
import org.apache.tapestry.IRequestCycle;
/**
* Implements a component that manages an HTML <input type=button> form element. [ <a
* href="../../../../../ComponentReference/Button.html">Component Reference </a>]
* <p>
* This component is useful for attaching JavaScript onclick event handlers.
*
* @author Howard Lewis Ship
* @author Paul Geerts
* @author Malcolm Edgar
*/
public abstract class Button extends AbstractFormComponent
{
protected void renderComponent(IMarkupWriter writer, IRequestCycle cycle)
{
IForm form = getForm(cycle);
if (form.wasPrerendered(writer, this))
return;
boolean rewinding = form.isRewinding();
String name = form.getElementId(this);
if (rewinding)
{
return;
}
writer.beginEmpty("input");
writer.attribute("type", "button");
writer.attribute("name", name);
if (isDisabled())
{
writer.attribute("disabled", "disabled");
}
String label = getLabel();
if (label != null)
{
writer.attribute("value", label);
}
renderInformalParameters(writer, cycle);
writer.closeTag();
}
public abstract String getLabel();
public abstract boolean isDisabled();
}