LiveHelp


1   /*
2    * Copyright 2005 Joe Walker
3    *
4    * Licensed under the Apache License, Version 2.0 (the "License");
5    * you may not use this file except in compliance with the License.
6    * You may obtain a copy of the License at
7    *
8    *     http://www.apache.org/licenses/LICENSE-2.0
9    *
10   * Unless required by applicable law or agreed to in writing, software
11   * distributed under the License is distributed on an "AS IS" BASIS,
12   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13   * See the License for the specific language governing permissions and
14   * limitations under the License.
15   */
16  package org.getahead.dwrdemo.livehelp;
17  
18  import java.util.Collection  ;
19  
20  import org.directwebremoting.Security;
21  import org.directwebremoting.WebContext;
22  import org.directwebremoting.WebContextFactory;
23  import org.directwebremoting.proxy.dwr.Util;
24  import org.directwebremoting.util.Logger;
25  
26  /**
27   * A simple shared input form that several users can share
28   * @author Joe Walker [joe at getahead dot ltd dot uk]
29   */
30  public class LiveHelp
31  {
32      /**
33       * Something has changed
34       * @param id The id of the field that changed
35       * @param value The new value
36       */
37      public void notifyTyping(String   id, String   value)
38      {
39          Util utilAll = new Util(getUsersToAffect());
40  
41          utilAll.setValue(id, Security.replaceXmlCharacters(value));
42      }
43  
44      /**
45       * The user has tabbed in
46       * @param id The id of the field that changed
47       */
48      public void notifyFocus(String   id)
49      {
50          Util utilAll = new Util(getUsersToAffect());
51  
52          utilAll.addClassName(id, "disabled");
53          String   addr = WebContextFactory.get().getHttpServletRequest().getRemoteAddr();
54          utilAll.setValue(id + "Tip", addr);
55  
56          //utilAll.addScript("$('" + id + "').disabled = true;");
57      }
58  
59      /**
60       * The user has tabbed out
61       * @param id The id of the field that changed
62       */
63      public void notifyBlur(String   id)
64      {
65          Util utilAll = new Util(getUsersToAffect());
66  
67          utilAll.removeClassName(id, "disabled");
68          utilAll.setValue(id + "Tip", "");
69  
70          //utilAll.addScript("$('" + id + "').disabled = false;");
71      }
72  
73      /**
74       * @return The collection of people to affect
75       */
76      private Collection   getUsersToAffect()
77      {
78          WebContext wctx = WebContextFactory.get();
79          String   currentPage = wctx.getCurrentPage();
80  
81          // For all the browsers on the current page:
82          Collection   sessions = wctx.getScriptSessionsByPage(currentPage);
83  
84          // But not the current user!
85          sessions.remove(wctx.getScriptSession());
86  
87          log.debug("Affecting " + sessions.size() + " users");
88  
89          return sessions;
90      }
91  
92      /**
93       * The log stream
94       */
95      private static final Logger log = Logger.getLogger(LiveHelp.class);
96  }
97
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