ColorRenderer


1   /* Copyright 2004-2005 Sun Microsystems, Inc.  All rights reserved.  You may not modify, use, reproduce, or distribute this software except in compliance with the terms of the License at: http://developer.sun.com/berkeley_license.html
2   $Id: ColorRenderer.java,v 1.3 2005/03/23 14:49:22 jenniferb Exp $  */
3   
4   package com.sun.j2ee.blueprints.catalog.validator;
5   
6   import javax.faces.component.*;
7   import javax.faces.context.FacesContext;
8   import javax.faces.context.ResponseWriter;
9   import java.io.IOException  ;
10  
11  
12  /**
13   * This class renders JavaScript
14   */
15  
16  
17  
18  public class ColorRenderer extends BaseRenderer {
19  
20  
21      // -------------------------------------------------------- Renderer Methods
22  
23      /**
24       * <p>No decoding is required.</p>
25       *
26       * @param context   <code>FacesContext</code>for the current request
27       * @param component <code>UIComponent</code> to be decoded
28       */
29  
30      public void decode(FacesContext context, UIComponent component) {
31  
32          if ((context == null) || (component == null)) {
33              throw new NullPointerException  ();
34          }
35      }
36  
37      /**
38       * <p>No begin encoding is required.</p>
39       *
40       * @param context   <code>FacesContext</code>for the current request
41       * @param component <code>UIComponent</code> to be decoded
42       */
43      public void encodeBegin(FacesContext context, UIComponent component)
44          throws IOException   {
45  
46          if ((context == null) || (component == null)) {
47              throw new NullPointerException  ();
48          }
49      }
50  
51      /**
52       * <p>No children encoding is required.</p>
53       *
54       * @param context   <code>FacesContext</code>for the current request
55       * @param component <code>UIComponent</code> to be decoded
56       */
57      public void encodeChildren(FacesContext context, UIComponent component)
58          throws IOException   {
59  
60          if ((context == null) || (component == null)) {
61              throw new NullPointerException  ();
62          }
63  
64      }
65  
66      /**
67       * <p>Encodes this component.</p>
68       *
69       * @param context   <code>FacesContext</code>for the current request
70       * @param component <code>UIComponent</code> to be decoded
71       */
72      public void encodeEnd(FacesContext context, UIComponent component)
73          throws IOException   {
74  
75          if ((context == null) || (component == null)) {
76              throw new NullPointerException  ();
77          }
78  
79          UIOutput script = (UIOutput) component;
80          UIInput currentColor = (UIInput) component.findComponent("color");
81          ResponseWriter writer = context.getResponseWriter();
82  
83          StringBuffer   sb = null;
84          System.out.println("currentColor =" + currentColor);
85          if (currentColor == null) return;
86          sb = new StringBuffer  ("function client_validation() {\n");
87          sb.append("if (document.forms[0]['");
88          sb.append(currentColor.getClientId(context));
89          sb.append("'].value=='red' ) {").append("\n");
90          sb.append("return true;");
91          sb.append("\n} else if (document.forms[0]['");
92          sb.append(currentColor.getClientId(context));
93          sb.append("'].value=='green' ) {").append("\n");
94          sb.append("return true;");
95          sb.append("\n} else if (document.forms[0]['");
96          sb.append(currentColor.getClientId(context));
97          sb.append("'].value=='blue' ) {").append("\n");
98          sb.append("return true;");
99          sb.append("\n } else {\n");
100         sb.append("alert('Enter red, green, or blue for the color.');");
101         sb.append("\nreturn false;\n");
102     sb.append("} \n }");
103         sb.append("\n");       
104     
105         if (writer != null) {
106             writer.startElement("script", script);
107             writer.writeAttribute("language", "JavaScript", "script");
108             writer.write(sb.toString());
109             writer.endElement("script");
110         }
111     }
112 
113 }
114 
115
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