Button


1   // Copyright 2004, 2005 The Apache Software Foundation
2   //
3   // Licensed under the Apache License, Version 2.0 (the "License");
4   // you may not use this file except in compliance with the License.
5   // You may obtain a copy of the License at
6   //
7   //     http://www.apache.org/licenses/LICENSE-2.0
8   //
9   // Unless required by applicable law or agreed to in writing, software
10  // distributed under the License is distributed on an "AS IS" BASIS,
11  // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12  // See the License for the specific language governing permissions and
13  // limitations under the License.
14  
15  package org.apache.tapestry.form;
16  
17  import org.apache.tapestry.IMarkupWriter;
18  import org.apache.tapestry.IRequestCycle;
19  
20  /**
21   * Implements a component that manages an HTML &lt;input type=button&gt; form element. [ <a
22   * HREF="../../../../../ComponentReference/Button.html">Component Reference </a>]
23   * <p>
24   * This component is useful for attaching JavaScript onclick event handlers.
25   * 
26   * @author Howard Lewis Ship
27   * @author Paul Geerts
28   * @author Malcolm Edgar
29   * @author Paul Ferraro
30   */
31  public abstract class Button extends AbstractFormComponent
32  {
33      /**
34       * @see org.apache.tapestry.form.AbstractFormComponent#renderFormComponent(org.apache.tapestry.IMarkupWriter,
35       *      org.apache.tapestry.IRequestCycle)
36       */
37      protected void renderFormComponent(IMarkupWriter writer, IRequestCycle cycle)
38      {
39          writer.beginEmpty("button");
40          writer.attribute("type", "button");
41          writer.attribute("name", getName());
42  
43          if (isDisabled())
44          {
45              writer.attribute("disabled", "disabled");
46          }
47  
48          renderIdAttribute(writer, cycle);
49  
50          renderInformalParameters(writer, cycle);
51  
52          String   label = getLabel();
53  
54          if (label != null)
55              writer.print(label);
56          else
57              renderBody(writer, cycle);
58  
59          writer.closeTag();
60      }
61  
62      public abstract String   getLabel();
63  }
64
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