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Last modified by Bastian Triller on 2021/08/07 03:59
From version 15.1
edited by Pascal Robert
on 2012/08/09 05:00
Change comment: There is no comment for this version
To version 11.1
edited by Pascal Robert
on 2012/08/09 04:05
Change comment: There is no comment for this version

Summary

Details

Page properties
Content
... ... @@ -1,3 +1,7 @@
1 +{{info}}
2 +Work in progress
3 +{{/info}}
4 +
1 1  So far, we have seen two of the technologies, D2W and ERRest, that Project Wonder offers for viewing and managing the data. In this tutorial, we will show how to do it with the "stateful" way of doing things. Stateful have been around since the beginning of WebObjects in 1996, so it's the oldest way of presenting data and constructing pages.
2 2  
3 3  Stateful means that you don't have to worry about creating sessions and keeping track of data coming from HTML input fields and controls. In fact, D2W is also stateful.
... ... @@ -156,7 +156,7 @@
156 156  import er.extensions.eof.ERXEC;
157 157  
158 158  public class AdminMainPage extends ERXComponent {
159 -
163 +
160 160   private ERXBatchingDisplayGroup<BlogEntry> _dg;
161 161  
162 162   public AdminMainPage(WOContext context) {
... ... @@ -167,42 +167,42 @@
167 167   _dg.setDataSource(dataSource);
168 168   _dg.setObjectArray(BlogEntry.fetchBlogEntries(editingContext(), BlogEntry.AUTHOR.eq(session().loggedAuthor()), BlogEntry.LAST_MODIFIED.descs()));
169 169   }
170 -
174 +
171 171   public ERXBatchingDisplayGroup<BlogEntry> displayGroup() {
172 172   return this._dg;
173 173   }
174 -
178 +
175 175   private String _emailAddress;
176 -
180 +
177 177   public String emailAddress() {
178 178   return this._emailAddress;
179 179   }
180 -
184 +
181 181   public void setEmailAddress(String emailAddress) {
182 182   this._emailAddress = emailAddress;
183 183   }
184 -
188 +
185 185   private BlogEntry _blogEntryItem;
186 186  
187 187   public void setBlogEntryItem(BlogEntry blogEntryItem) {
188 188   this._blogEntryItem = blogEntryItem;
189 189   }
190 -
194 +
191 191   public BlogEntry blogEntryItem() {
192 192   return this._blogEntryItem;
193 193   }
194 -
198 +
195 195   @Override
196 196   public Session session() {
197 197   return ((Session)super.session());
198 198   }
199 -
203 +
200 200   public boolean isLogged() {
201 201   return ((session()).loggedAuthor() == null) ? false: true;
202 202   }
203 -
207 +
204 204   private EOEditingContext _ec;
205 -
209 +
206 206   public EOEditingContext editingContext() {
207 207   if (_ec == null) {
208 208   _ec = ERXEC.newEditingContext();
... ... @@ -209,13 +209,13 @@
209 209   }
210 210   return _ec;
211 211   }
212 -
216 +
213 213   private String _errorMessage = null;
214 -
218 +
215 215   public String errorMessage() {
216 216   return this._errorMessage;
217 217   }
218 -
222 +
219 219   public WOActionResults login() {
220 220   Author loggedAuthor = Author.validateLogin(editingContext(), _emailAddress);
221 221   if (loggedAuthor != null) {
... ... @@ -224,7 +224,7 @@
224 224   _errorMessage = "Invalid email address";
225 225   }
226 226   return null;
227 - }
231 + }
228 228  }
229 229  
230 230  {{/code}}
... ... @@ -235,37 +235,30 @@
235 235  
236 236  {{code}}
237 237  
238 -<wo:AjaxUpdateContainer id="main">
242 +
243 + <wo:AjaxUpdateContainer id="main">
239 239   <wo:if condition="$isLogged">
240 240   <wo:if condition="$displayGroup.hasMultipleBatches">
241 241   <div>
242 242   <wo:link action="$displayGroup.displayPreviousBatch">Previous</wo:link>
243 - | Batch
248 + | Batch
244 244   <wo:str value="$displayGroup.currentBatchIndex" />
245 - of
250 + of
246 246   <wo:str value="$displayGroup.batchCount" />
247 - |
252 + |
248 248   <wo:link action="$displayGroup.displayNextBatch">Next</wo:link>
249 249   </div>
250 250   </wo:if>
251 - <table>
252 - <tr>
253 - <th><wo:WOSortOrder displayGroup="$displayGroup" key="title" /> Title</th>
254 - <th>Author</th>
255 - <th><wo:WOSortOrder displayGroup="$displayGroup" key="creationDate" /> Created on</th>
256 - <th><wo:WOSortOrder displayGroup="$displayGroup" key="lastModified" /> Last modified</th>
257 - </tr>
258 - <wo:loop list="$displayGroup.displayedObjects" item="$blogEntryItem">
259 - <tr>
260 - <td>
261 - <wo:str value="$blogEntryItem.title" />
262 - </td>
263 - <td> <wo:str value="$blogEntryItem.author.fullName" /> </td>
264 - <td> <wo:str value="$blogEntryItem.creationDate" dateformat="%Y/%m/%d" /> </td>
265 - <td> <wo:str value="$blogEntryItem.lastModified" dateformat="%Y/%m/%d" /> </td>
266 - </tr>
267 - </wo:loop>
268 - </table>
256 + <wo:loop list="$displayGroup.displayedObjects" item="$blogEntryItem">
257 + <p><wo:str value="$blogEntryItem.title" /></p>
258 + <p><wo:str value="$blogEntryItem.content" escapeHTML="false" /></p>
259 + <p>Created by
260 + <wo:str value="$blogEntryItem.author.fullName" />
261 + on
262 + <wo:str value="$blogEntryItem.creationDate" />
263 + </p>
264 + <hr />
265 + </wo:loop>
269 269   </wo:if>
270 270   <wo:else>
271 271   <wo:if condition="$errorMessage">
... ... @@ -287,7 +287,7 @@
287 287  
288 288  {{code}}
289 289  
290 -<wo:link pageName="AdminMainPage">Admin</wo:link>
287 + <wo:link pageName="AdminMainPage">Admin</wo:link>
291 291  
292 292  {{/code}}
293 293  
... ... @@ -294,128 +294,3 @@
294 294  Save everything, run the app and try to login. If login is not successful, you will get an error message. If login is valid, you will see the blog entries that you created.
295 295  
296 296  For the last part of this tutorial, we are going to add a link on each blog entry in the list that will bring us to a edit page where we can modify a blog entry. We are also going to add a link to create a new blog entry.
297 -
298 -Create a new component, and name it **EditBlogEntry**. Open **EditBlogEntry.java** and override the code with:
299 -
300 -{{code}}
301 -
302 -package your.app.components;
303 -
304 -import your.app.Session;
305 -import your.app.model.Author;
306 -import your.app.model.BlogEntry;
307 -
308 -import com.webobjects.appserver.WOActionResults;
309 -import com.webobjects.appserver.WOContext;
310 -import com.webobjects.eocontrol.EOEditingContext;
311 -
312 -import er.extensions.components.ERXComponent;
313 -import er.extensions.eof.ERXEC;
314 -import er.extensions.eof.ERXEOControlUtilities;
315 -
316 -public class EditBlogEntry extends ERXComponent {
317 -
318 - public EditBlogEntry(WOContext context) {
319 - super(context);
320 - }
321 -
322 - private BlogEntry _blogEntry;
323 -
324 - public BlogEntry blogEntry() {
325 - return this._blogEntry;
326 - }
327 -
328 - public void setBlogEntry(BlogEntry blogEntry) {
329 - if (blogEntry == null) {
330 - this._blogEntry = ERXEOControlUtilities.createAndInsertObject(editingContext(), BlogEntry.class);
331 - Author localUser = ERXEOControlUtilities.localInstanceOfObject(editingContext(), session().loggedAuthor());
332 - this._blogEntry.setAuthorRelationship(localUser);
333 - } else {
334 - this._blogEntry = ERXEOControlUtilities.localInstanceOfObject(editingContext(), blogEntry);
335 - }
336 - }
337 -
338 - private EOEditingContext _ec;
339 -
340 - public EOEditingContext editingContext() {
341 - if (_ec == null) {
342 - _ec = ERXEC.newEditingContext();
343 - }
344 - return _ec;
345 - }
346 -
347 - @Override
348 - public Session session() {
349 - return ((Session)super.session());
350 - }
351 -
352 - public WOActionResults save() {
353 - editingContext().saveChanges();
354 - return pageWithName(AdminMainPage.class);
355 - }
356 -}
357 -
358 -{{/code}}
359 -
360 -Open **EditBlogEntry.wo** and between the <body> tag, add the following:
361 -
362 -{{code}}
363 -
364 -<wo:form>
365 - <div>
366 - <label>Title:</label>
367 - <wo:textfield value="$blogEntry.title" />
368 - </div>
369 - <div>
370 - <label>Content:</label>
371 - <wo:text value="$blogEntry.content" rows="20" cols="80" />
372 - </div>
373 - <div>Author: <wo:str value="$session.loggedAuthor.fullName" /></div>
374 - <div><wo:submitButton action="$save" value="Save changes" /></div>
375 - </wo:form>
376 -
377 -{{/code}}
378 -
379 -We now have a form to edit or create a blog entry. Save the component and the Java class, and open **AdminMainPage.java** to add the following code:
380 -
381 -{{code}}
382 -
383 -public WOActionResults editBlogEntry() {
384 - EditBlogEntry nextPage = pageWithName(EditBlogEntry.class);
385 - nextPage.setBlogEntry(_blogEntryItem);
386 - return nextPage;
387 - }
388 -
389 - public WOActionResults createBlogEntry() {
390 - EditBlogEntry nextPage = pageWithName(EditBlogEntry.class);
391 - nextPage.setBlogEntry(null);
392 - return nextPage;
393 - }
394 -
395 -{{/code}}
396 -
397 -Open **AdminMainPage.wo** and just after <wo:if condition="$isLogged">, add the following line:
398 -
399 -{{code}}
400 -
401 -<div><wo:link action="$createBlogEntry">Create a new blog entry</wo:link></div>
402 -
403 -{{/code}}
404 -
405 -Find this line:
406 -
407 -{{code}}
408 -
409 -<wo:str value="$blogEntryItem.title" />
410 -
411 -{{/code}}
412 -
413 -and replace it with:
414 -
415 -{{code}}
416 -
417 -<wo:link action="$editBlogEntry"><wo:str value="$blogEntryItem.title" /></wo:link>
418 -
419 -{{/code}}
420 -
421 -Save everything, run the app, click on the "admin" link, login and check if you can create or edit a blog entry. Everything should be working, and just created your first stateful Project Wonder application