SelectGroupTag


1   /*
2    * SelectEPersonTag
3    *
4    * Version: $Revision: 1.1 $
5    *
6    * Date: $Date: 2005/10/13 05:48:03 $
7    *
8    * Copyright (c) 2002, Hewlett-Packard Company and Massachusetts
9    * Institute of Technology.  All rights reserved.
10   *
11   * Redistribution and use in source and binary forms, with or without
12   * modification, are permitted provided that the following conditions are
13   * met:
14   *
15   * - Redistributions of source code must retain the above copyright
16   * notice, this list of conditions and the following disclaimer.
17   *
18   * - Redistributions in binary form must reproduce the above copyright
19   * notice, this list of conditions and the following disclaimer in the
20   * documentation and/or other materials provided with the distribution.
21   *
22   * - Neither the name of the Hewlett-Packard Company nor the name of the
23   * Massachusetts Institute of Technology nor the names of their
24   * contributors may be used to endorse or promote products derived from
25   * this software without specific prior written permission.
26   *
27   * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
28   * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
29   * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
30   * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
31   * HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
32   * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
33   * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
34   * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
35   * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR
36   * TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE
37   * USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH
38   * DAMAGE.
39   */
40  
41  package org.dspace.app.webui.jsptag;
42  
43  import java.io.IOException  ;
44  
45  import javax.servlet.http.HttpServletRequest  ;
46  import javax.servlet.jsp.JspException  ;
47  import javax.servlet.jsp.JspWriter  ;
48  import javax.servlet.jsp.jstl.fmt.LocaleSupport;
49  import javax.servlet.jsp.tagext.TagSupport  ;
50  
51  import org.dspace.eperson.Group;
52  
53  /**
54   * <P>Tag for producing an e-person select widget in a form.  Somewhat
55   * analogous to the HTML SELECT element.  An input
56   * field is produced with a button which pops up a window from which
57   * e-people can be selected.  Selected e-epeople are added to the field
58   * in the form.  If the selector is for multiple e-people, a 'remove
59   * selected from list' button is also added.</P>
60   *
61   * <P>On any form that has a selecteperson tag (only one allowed per page),
62   * you need to include the following Javascript code on all of the submit
63   * buttons, to ensure that the e-people IDs are posted and that the popup
64   * window is closed:</P>
65   *
66   * <P><code>onclick="javascript:finishEPerson();"</code></P>
67   *
68   * @author  Robert Tansley
69   * @version $Revision: 1.1 $
70   */
71  public class SelectGroupTag extends TagSupport  
72  {
73      /** Multiple groups? */
74      private boolean multiple;
75      
76      /** Which groups are initially in the list? */
77      private Group[] groups; 
78  
79  
80      public SelectGroupTag()
81      {
82          super();
83      }
84  
85      
86      /**
87       * Setter for multiple attribute
88       * 
89       * @param s  attribute from JSP
90       */
91      public void setMultiple(String   s)
92      {
93          if (s != null && (s.equalsIgnoreCase("yes") || s.equalsIgnoreCase("true")))
94          {
95              multiple = true;
96          }
97          else
98          {
99              multiple = false;
100         }
101     }
102 
103     /**
104      * Setter for groups in list
105      * 
106      * @param e  attribute from JSP
107      */
108     public void setSelected(Object   g)
109     {
110         if (g instanceof Group)
111         {
112             groups = new Group[1];
113             groups[0] = (Group) g;
114         }
115         else if(g instanceof Group[])
116         {
117             groups = (Group[]) g;
118         }
119     }
120 
121     
122     public void release()
123     {
124         multiple = false;
125         groups   = null;
126     }
127 
128 
129     public int doStartTag()
130         throws JspException  
131     {
132         try
133         {
134             JspWriter   out = pageContext.getOut();
135             HttpServletRequest   req = (HttpServletRequest  ) pageContext.getRequest();
136             
137             out.print("<table><tr><td colspan=\"2\" align=\"center\"><select multiple=\"multiple\" name=\"group_ids\" size=\"");
138             out.print(multiple ? "10" : "1");
139             out.println("\">");
140             
141             //ensure that if no group is selected that a blank option is displayed - xhtml compliance 
142             if (groups == null || groups.length == 0)
143             {
144               out.print("<option value=\"\">&nbsp;</option>");
145             }
146             
147             if (groups != null)
148             {
149                 for (int i = 0; i < groups.length; i++)
150                 {
151                     out.print("<option value=\"" + groups[i].getID() + "\">");
152                     out.print(groups[i].getName() + " (" + groups[i].getID() + ")");
153                     out.println("</option>");
154                 }
155             }
156             
157             out.print("</select></td>");
158             
159             if (multiple)
160             {
161                 out.print("</tr><tr><td width=\"50%\" align=\"center\">");
162             }
163             else
164             {
165                 out.print("<td>");
166             }
167             
168             String   p = (multiple ? 
169                     LocaleSupport.getLocalizedMessage(pageContext,
170                             "org.dspace.app.webui.jsptag.SelectGroupTag.selectGroups")
171                     : LocaleSupport.getLocalizedMessage(pageContext,
172                             "org.dspace.app.webui.jsptag.SelectGroupTag.selectGroup") );
173             out.print("<input type=\"button\" value=\"" + p 
174                             + "\" onclick=\"javascript:popup_window('"
175                             + req.getContextPath() + "/tools/group-select-list?multiple=" 
176                             + multiple + "', 'group_popup');\" />");
177             
178             if (multiple)
179             {
180                 out.print("</td><td width=\"50%\" align=\"center\">");
181                 out.print("<input type=\"button\" value=\""
182                             + LocaleSupport.getLocalizedMessage(pageContext,
183                                 "org.dspace.app.webui.jsptag.SelectGroupTag.removeSelected")
184                                 + "\" onclick=\"javascript:removeSelected(window.document.forms[0].group_ids);\"/>");
185             }
186 
187             out.println("</td></tr></table>");
188         }
189         catch (IOException   ie)
190         {
191             throw new JspException  (ie);
192         }           
193         
194         return SKIP_BODY;
195     }
196 }
197
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