| // Copyright 2004 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 |
| * @version $Id$ |
| **/ |
| |
| public abstract class Button extends AbstractFormComponent |
| { |
| protected void renderComponent(IMarkupWriter writer, IRequestCycle cycle) |
| { |
| IForm form = getForm(cycle); |
| |
| 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(); |
| } |