diff options
| author | xue <> | 2007-06-26 15:59:16 +0000 |
|---|---|---|
| committer | xue <> | 2007-06-26 15:59:16 +0000 |
| commit | f92ca63a225d43e7ecca4ebe528c2a1e206a40f1 (patch) | |
| tree | 0fb92aafab5fedc866c6cafd49433d72bf719114 /demos/blog-tutorial/protected/pages/Day4/CreateEditPost.page | |
| parent | c31e5ab3ebd4ae1561cbdaeaa504d1095dcbbb0a (diff) | |
Completed day 4 for blog tutorial.
Diffstat (limited to 'demos/blog-tutorial/protected/pages/Day4/CreateEditPost.page')
| -rw-r--r-- | demos/blog-tutorial/protected/pages/Day4/CreateEditPost.page | 133 |
1 files changed, 133 insertions, 0 deletions
diff --git a/demos/blog-tutorial/protected/pages/Day4/CreateEditPost.page b/demos/blog-tutorial/protected/pages/Day4/CreateEditPost.page new file mode 100644 index 00000000..95d00765 --- /dev/null +++ b/demos/blog-tutorial/protected/pages/Day4/CreateEditPost.page @@ -0,0 +1,133 @@ +<com:TContent ID="Main">
+
+<h1>Creating <tt>EditPost</tt> Page</h1>
+
+<p>
+The <tt>EditPost</tt> page is provided to authors and the administrator to edit existing blog posts. Like the <a href="?page=Day4.CreateNewPost">NewPost</a> page, it displays a form to collect the change to the title and content of a post.
+</p>
+
+<p>
+We create two files <tt>protected/pages/posts/EditPost.page</tt> and <tt>protected/pages/posts/EditPost.php</tt> to save the page template and page class, respectively.
+</p>
+
+<h2>Creating Page Template</h2>
+<p>
+The <tt>EditPost</tt> page template is very similar to the <tt>NewPost</tt> template. Only the page title and the button caption are different.
+</p>
+
+<com:TTextHighlighter CssClass="source" Language="prado">
+<%@ Title="My Blog - Edit Post" %>
+
+<com:TContent ID="Main">
+
+<h1>Edit Post</h1>
+
+<span>Title:</span>
+<com:TRequiredFieldValidator
+ ControlToValidate="TitleEdit"
+ ErrorMessage="Please provide a title."
+ Display="Dynamic" />
+<br/>
+<com:TTextBox ID="TitleEdit" Columns="50" />
+
+<br/>
+<span>Content:</span>
+<com:TRequiredFieldValidator
+ ControlToValidate="ContentEdit"
+ ErrorMessage="Please provide content."
+ Display="Dynamic" />
+<br/>
+<com:THtmlArea ID="ContentEdit" />
+
+<br/>
+<com:TButton Text="Save" OnClick="saveButtonClicked" />
+
+</com:TContent>
+</com:TTextHighlighter>
+
+
+<h2>Creating Page Class</h2>
+
+<p>
+The <tt>EditPage</tt> page class is slightly complex than <tt>NewPage</tt> because it needs to load the specified post data first. It also needs to perform additional authorization check. In particular, it needs to ensure that a post can only be editted by the author or the administrator. Such authorization check is not provided by PRADO itself.
+</p>
+
+<com:TTextHighlighter CssClass="source" Language="php">
+class EditPost extends TPage
+{
+ /**
+ * Initializes the inputs with existing post data.
+ * This method is invoked by the framework when the page is being initialized.
+ * @param mixed event parameter
+ */
+ public function onInit($param)
+ {
+ parent::onInit($param);
+ // Retrieves the existing user data. This is equivalent to:
+ // $postRecord=$this->getPost();
+ $postRecord=$this->Post;
+ // Authorization check: only the author or the administrator can edit the post
+ if($postRecord->author_id!==$this->User->Name && !$this->User->IsAdmin)
+ throw new THttpException(500,'You are not allowed to edit this post.');
+
+ if(!$this->IsPostBack) // if the page is initially requested
+ {
+ // Populates the input controls with the existing post data
+ $this->TitleEdit->Text=$postRecord->title;
+ $this->ContentEdit->Text=$postRecord->content;
+ }
+ }
+
+ /**
+ * Saves the post if all inputs are valid.
+ * This method responds to the OnClick event of the "Save" button.
+ * @param mixed event sender
+ * @param mixed event parameter
+ */
+ public function saveButtonClicked($sender,$param)
+ {
+ if($this->IsValid) // when all validations succeed
+ {
+ // Retrieves the existing user data. This is equivalent to:
+ // $postRecord=$this->getPost();
+ $postRecord=$this->Post;
+
+ // Fetches the input data
+ $postRecord->title=$this->TitleEdit->SafeText;
+ $postRecord->content=$this->ContentEdit->SafeText;
+
+ // saves to the database via Active Record mechanism
+ $postRecord->save();
+
+ // redirects the browser to the ReadPost page
+ $url=$this->Service->constructUrl('posts.ReadPost',array('id'=>$postRecord->post_id));
+ $this->Response->redirect($url);
+ }
+ }
+
+ /**
+ * Returns the post data to be editted.
+ * @return PostRecord the post data to be editted.
+ * @throws THttpException if the post data is not found.
+ */
+ protected function getPost()
+ {
+ // the ID of the post to be editted is passed via GET parameter 'id'
+ $postID=(int)$this->Request['id'];
+ // use Active Record to look for the specified post ID
+ $postRecord=PostRecord::finder()->findByPk($postID);
+ if($postRecord===null)
+ throw new THttpException(500,'Post is not found.');
+ return $postRecord;
+ }
+}
+</com:TTextHighlighter>
+
+<h2>Testing</h2>
+<p>
+To test the <tt>EditPost</tt> page, login first and visit the following URL: <tt>http://hostname/blog/index.php?page=EditPost&id=1</tt>. This URL can also be reached by clicking on the <tt>Edit</tt> link on a post detail page.
+</p>
+
+<img src="<%~ output4.gif %>" class="output" />
+
+</com:TContent>
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