From a39627655aefb65df1e2cc845bd6ebf3d0a40a72 Mon Sep 17 00:00:00 2001 From: admin Date: Mon, 9 Oct 2006 03:31:32 +0000 Subject: --- user_guide/libraries/table.html | 169 ++-------------------------------------- 1 file changed, 6 insertions(+), 163 deletions(-) (limited to 'user_guide/libraries') diff --git a/user_guide/libraries/table.html b/user_guide/libraries/table.html index 68b31165b..f861a2c96 100644 --- a/user_guide/libraries/table.html +++ b/user_guide/libraries/table.html @@ -47,7 +47,7 @@ window.onload = function() { Code Igniter Home  ›  User Guide Home  ›  -Trackback Class +HTML Table Class
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@@ -61,173 +61,16 @@ Trackback Class
-

Trackback Class

+

HTML Table Class

-

The Trackback Class provides functions that enable you to send and receive Trackback data.

- - -

If you are not familiar with Trackbacks you'll find more information here.

+

The Table Class provides functions that enable you to auto-generate HTML tables from arrays or database result sets.

Initializing the Class

-

Like most other classes in Code Igniter, the Trackback class is initialized in your controller using the $this->load->library function:

- -$this->load->library('trackback'); -

Once loaded, the Trackback library object will be available using: $this->trackback

- - -

Sending Trackbacks

- -

A Trackback can be sent from any of your controller functions using code similar to this example: - -$this->load->library('trackback');
-
-$tb_data = array(
-                'ping_url'  => 'http://some-site.com/trackback/456',
-                'url'       => 'http://www.my-site.com/blog/entry/123',
-                'title'     => 'The Title of My Entry',
-                'excerpt'   => 'The entry content.',
-                'blog_name' => 'My Blog Name',
-                'charset'   => 'utf-8'
-                );
-
-if ( ! $this->trackback->send($tb_data))
-{
-     echo $this->trackback->display_errors();
-}
-else
-{
-     echo 'Trackback was sent!';
-} - -

Description of array data:

- - - -

The Trackback sending function returns TRUE/FALSE (boolean) on success or failure. If it fails, you can retrieve the error message using:

- -$this->trackback->display_errors(); - - -

Receiving Trackbacks

- -

Before you can receive Trackbacks you must create a weblog. If you don't have a blog yet there's no point in continuing.

- -

Receiving Trackbacks is a little more complex than sending them, only because you will need a database table in which to store them, -and you will need to validate the incoming trackback data. You are encouraged to implement a thorough validation process to -guard against spam and duplicate data. You may also want to limit the number of Trackbacks you allow from a particular IP within -a given span of time to further curtail spam. The process of receiving a Trackback is quite simple; -the validation is what takes most of the effort.

- -

Your Ping URL

- -

In order to accept Trackbacks you must display a Trackback URL next to each one of your weblog entries. This will be the URL -that people will use to send you Trackbacks (we will refer to this as your "Ping URL").

- -

Your Ping URL must point to a controller function where your Trackback receiving code is located, and the URL -must contain the ID number for each particular entry, so that when the Trackback is received you'll be -able to associate it with a particular entry.

- -

For example, if your controller class is called Trackback, and the receiving function is called receive, your -Ping URLs will look something like this:

- -http://www.your-site.com/index.php/trackback/receive/entry_id - -

Where entry_id represents the individual ID number for each of your entries.

- - -

Creating a Trackback Table

- -

Before you can receive Trackbacks you must create a table in which to store them. Here is a basic prototype for such a table:

- - - - -

The Trackback specification only requires four pieces of information to be sent in a Trackback (url, title, excerpt, blog_name), -but to make the data more useful we've added a few more fields in the above table schema (date, IP address, etc.).

- -

Processing a Trackback

- -

Here is an example showing how you will receive and process a Trackback. The following -code is intended for use within the controller function where you expect to receive Trackbacks.

- -$this->load->library('trackback');
-$this->load->database();
-
-if ($this->uri->segment(3) == FALSE)
-{
-    $this->trackback->send_error("Unable to determine the entry ID");
-}
-
-if ( ! $this->trackback->receive())
-{
-    $this->trackback->send_error("The Trackback did not contain valid data");
-}
-
-$data = array(
-                'tb_id'      => '',
-                'entry_id'   => $this->uri->segment(3),
-                'url'        => $this->trackback->data('url'),
-                'title'      => $this->trackback->data('title'),
-                'excerpt'    => $this->trackback->data('excerpt'),
-                'blog_name'  => $this->trackback->data('blog_name'),
-                'tb_date'    => time(),
-                'ip_address' => $this->input->ip_address()
-                );
-
-$sql = $this->db->insert_string('trackbacks', $data);
-$this->db->query($sql);
-
-$this->trackback->send_success(); - -

Notes:

- -

The entry ID number is expected in the third segment of your URL. This is based on the URI example we gave earlier:

- -http://www.your-site.com/index.php/trackback/receive/entry_id - -

Notice the entry_id is in the third URI, which you can retrieve using:

- -$this->uri->segment(3); - -

In our Trackback receiving code above, if the third segment is missing, we will issue an error. Without a valid entry ID, there's no -reason to continue.

- -

The $this->trackback->receive() function is simply a validation function that looks at the incoming data -and makes sure it contains the four pieces of data that are required (url, title, excerpt, blog_name). -It returns TRUE on success and FALSE on failure. If it fails you will issue an error message.

- -

The incoming Trackback data can be retrieved using this function:

- -$this->trackback->data('item') - -

Where item represents one of these four pieces of info: url, title, excerpt, or blog_name

- -

If the Trackback data is successfully received, you will issue a success message using:

- -$this->trackback->send_success(); - -

Note: The above code contains no data validation, which you are encouraged to add.

+

Like most other classes in Code Igniter, the Table class is initialized in your controller using the $this->load->library function:

+$this->load->library('table'); +

Once loaded, the Trackback library object will be available using: $this->table

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