Skip to Content
Last modified by Bastian Triller on 2021/08/07 03:59
From version 8.1
edited by Pascal Robert
on 2012/08/09 03:52
Change comment: There is no comment for this version
To version 9.1
edited by Pascal Robert
on 2012/08/06 05:45
Change comment: There is no comment for this version

Summary

Details

Page properties
Content
... ... @@ -25,14 +25,12 @@
25 25  
26 26  [[image:Capture d’écran 2012-08-06 à 05.15.32.png||border="1"]]
27 27  
28 -We are ready to code Open the **Components** folder of the project, and open **Main WO**. In the **Related** view (bottom-right), you see that all related files of the component are listed, and we need to open the Java code associated with the component. To do so, in the **Related** view, double-click on **Main.java** to open the Java class into an editor.
28 +We are ready to code! Open the **Components** folder of the project, and open **Main WO**. In the **Related** view (bottom-right), you see that all related files of the component are listed, and we need to open the Java code associated with the component. To do so, in the **Related** view, double-click on **Main.java** to open the Java class into an editor.
29 29  
30 30  In **Main.java**, we need some Java code to get the list of blog entries so that we can show that list into the component. The following code will do what we need:
31 31  
32 32  {{code}}
33 33  
34 -import your.app.model.BlogEntry;
35 -
36 36  import com.webobjects.appserver.WOContext;
37 37  import com.webobjects.eoaccess.EODatabaseDataSource;
38 38  import com.webobjects.eocontrol.EOEditingContext;
... ... @@ -42,10 +42,7 @@
42 42  import er.extensions.eof.ERXEC;
43 43  
44 44  public class Main extends ERXComponent {
45 -
46 - private EOEditingContext _ec;
47 - private BlogEntry _blogEntryItem;
48 -
43 +
49 49   public Main(WOContext context) {
50 50   super(context);
51 51   EODatabaseDataSource dataSource = new EODatabaseDataSource(editingContext(), BlogEntry.ENTITY_NAME);
... ... @@ -55,6 +55,8 @@
55 55   dg.setObjectArray(BlogEntry.fetchAllBlogEntries(editingContext(), BlogEntry.LAST_MODIFIED.descs()));
56 56   }
57 57  
53 + private EOEditingContext _ec;
54 +
58 58   private EOEditingContext editingContext() {
59 59   if (_ec == null) {
60 60   _ec = ERXEC.newEditingContext();
... ... @@ -62,108 +62,6 @@
62 62   return _ec;
63 63   }
64 64  
65 - public void setBlogEntryItem(BlogEntry blogEntryItem) {
66 - this._blogEntryItem = blogEntryItem;
67 - }
68 -
69 - public BlogEntry blogEntryItem() {
70 - return this._blogEntryItem;
71 - }
72 -
73 73  }
74 74  
75 75  {{/code}}
76 -
77 -[[ERXBatchingDisplayGroup>>http://jenkins.wocommunity.org/job/Wonder/lastSuccessfulBuild/javadoc/er/extensions/appserver/ERXDisplayGroup.html]] is a subclass of WODisplayGroup, a utility that adds multiple actions and logic to a list of objects. One of the best features of ERXBatchingDisplayGroup is that it does real batching (if the RDBMS that you use supports it), so that means that if we specify a batch of 20 objects (//dg.setNumberOfObjectsPerBatch(20)//), it will fetch only the first 20 objects from the database, and if you switch to the next batch, the display group will go to the database to get the next 20 objects. ERXBatchingDisplayGroup is useful if you known that your list will contains hundred of objects.
78 -
79 -Let's edit the component. Open **Main.wo** and edit the content in the top panel to be:
80 -
81 -{{code}}
82 -
83 -<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
84 -<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en">
85 - <head>
86 - <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
87 - <title>untitled</title>
88 - </head>
89 - <body>
90 - <h1>Our super blog</h1>
91 - <wo:if condition="$displayGroup.hasMultipleBatches">
92 - <div>
93 - <wo:link action="$displayGroup.displayPreviousBatch">Previous</wo:link>
94 - | Batch
95 - <wo:str value="$displayGroup.currentBatchIndex" />
96 - of
97 - <wo:str value="$displayGroup.batchCount" />
98 - |
99 - <wo:link action="$displayGroup.displayNextBatch">Next</wo:link>
100 - </div>
101 - </wo:if>
102 - <wo:loop list="$displayGroup.displayedObjects" item="$blogEntryItem">
103 - <p><wo:str value="$blogEntryItem.title" /></p>
104 - <p><wo:str value="$blogEntryItem.content" escapeHTML="false" /></p>
105 - <p>Created by
106 - <wo:str value="$blogEntryItem.author.fullName" />
107 - on
108 - <wo:str value="$blogEntryItem.creationDate" />
109 - </p>
110 - <hr />
111 - </wo:loop>
112 - </body>
113 -</html>
114 -
115 -{{/code}}
116 -
117 -The condition //displayGroup.hasMultipleBatches// checks if we have more than 20 objects. If that's true, we will show a HTML div with links to navigate between batches. After that condition, we loop over the displayedObjects (the current batch of objects) and we use WOString elements to display details about each blog entry.
118 -
119 -You can run the application to check if everything is working. If everything is ok, terminate the app.
120 -
121 -The next steps is to build the administration part of the application. The first thing we need to do is to add a variable and two methods in **Session.java** that will store the logged user. Open **Session.java** and add the following code:
122 -
123 -{{code}}
124 -
125 - private Author _loggedAuthor;
126 -
127 - public Session() {
128 - this._loggedAuthor = null;
129 - }
130 -
131 - public Author loggedAuthor() {
132 - return this._loggedAuthor;
133 - }
134 -
135 - public void setAuthor(Author loggedAuthor) {
136 - this._loggedAuthor = loggedAuthor;
137 - }
138 -
139 -
140 -{{/code}}
141 -
142 -Save the file. Next: we need to add a component to present the login form to the user. Right-click on the **Components** folder in the project, and select **New** -> **WOComponent**. Change the name of the component to be **AdminMainPage** and change the superclass to **er.extensions.components.ERXComponent**.
143 -
144 -After the component have been created, open **AdminMainPage.java** and add the following code:
145 -
146 -{{code}}
147 -
148 -import your.app.Session;
149 -
150 - private String _emailAddress;
151 -
152 - public String emailAddress() {
153 - return this._emailAddress;
154 - }
155 -
156 - public void setEmailAddress(String emailAddress) {
157 - this._emailAddress = emailAddress;
158 - }
159 -
160 - @Override
161 - public WOSession session() {
162 - return ((Session)session());
163 - }
164 -
165 - public boolean isLogged() {
166 - return ((session()).loggedAuthor() == null) ? false: true;
167 - }
168 -
169 -{{/code}}