Creating the Module File in Visual Basic .NET

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The actual code for the Missing Metadata Items module requires both presentation code and logic. In a more sophisticated application, it would be wise to break up these two pieces like you did earlier in the book when you created a template. By putting the presentation aspects in a separate file such as a CSS file or a template file, they can be developed and modified independently. This module, however, is fairly simple, and in the interest of maintaining simplicity, all of the code will be contained in a single file. Create a new file named mod_missingdata.php in the \mod_missingdata folder, and enter the following code:
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< php /** * @version $Id: mod_missingmeta.php 2007-07-12 21:49:30Z Danr $ */ // no direct access defined( '_JEXEC' ) or die( 'Restricted access' ); $db =& JFactory::getDBO(); // Find all empty strings in metakey and metadesc and // make sure the article is published (state=1). $where = "(metakey = '' or metadesc = '') and state = 1 "; $query = "SELECT id, title, metakey, metadesc" . " FROM #__content WHERE " . $where . " ORDER BY title ASC"; $db->setQuery( $query, 0); > <table class="adminlist"> <tr> <td class="title"> <strong>< php echo JText::_( 'Article' ); ></strong> </td> <td class="title"> <strong>< php echo JText::_( 'Empty Description' ); ></strong> </td>
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CHAPTER 13 s CREATING EXTENSIONS
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<td class="title"> <strong>< php echo JText::_( 'Empty Keys' ); ></strong> </td> </tr> < php // Make sure some rows match query if ($rows = $db->loadObjectList()) { foreach ($rows as $row) { // Create url to allow user to click & jump to edit article $url = "index.php option=com_content&task=edit&" . "&id=" . $row->id; // Check meta fields for record and set Yes/No value if ($row->metadesc =="") $metad = JText::_("Yes"); else $metad = JText::_("No"); if ($row->metakey =="") $metak = JText::_("Yes"); else $metak = JText::_("No"); echo "<tr>"; // Place article title inside link echo "<td><a href='" . $url . "'>" . $row->title . "</a></td>"; // Display status of empty meta column echo "<td>" . $metad . "</td>"; echo "<td>" . $metak . "</td>"; echo "</tr>"; } } else { // No articles with missing metadata found echo '<tr><td>None</td>'; echo '<td>n/a</td>'; echo '<td>n/a</td></tr>'; } > </table>
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This module has code that is quite a bit more sophisticated than the earlier greeting module. The first section of PHP code requests a reference to the database object and stores it in the $db variable. Then a WHERE statement is created for the MySQL query, which will only select records that have either a metakey or metadesc field that is empty. The query also requires that the state of the article be set to a value of 1, which indicates that the article is published.
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CHAPTER 13 s CREATING EXTENSIONS
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The $query variable is created to contain the entire search query and select the id, title, metakey, and metadesc columns to be returned in the data set. The query uses the #__content statement to specify that the Joomla content table should be searched. The #__ directive tells Joomla to add the current table prefix set by the user usually the jos_ default prefix is used. The setQuery() method of the database object is called to store the query string. The section that follows the PHP code is HTML display code to create a table to display the article list. The table is set to use class attributes (such as adminlist and title) so that the style complies with the current template settings. Three columns are created to display the article title link, the indicator for whether the metadesc field is empty, and the indicator for whether the metakey field for page keywords is empty. The second batch of PHP code actually outputs the article list. An if statement tests to make sure there are in fact articles with missing meta information. If the data set is empty, then the code execution jumps down and displays a single row with the values None, n/a, and n/a. When there are articles that comply with the query parameters, a foreach loop cycles through each row or record. First, a URL is created for the links that will be added on the titles. Note that the URL includes the task parameter set to edit. This parameter will cause the link to bring up the article in Edit mode when it is clicked. The two following if statements check to see if the fields are empty and set variables to display the word Yes or No in the appropriate column. Once again, the JText::_() method is used to convert the words Yes and No to the configured language if necessary. The remaining code outputs a three-column row for each record including the title link and indicators of which field is empty. Place this file along with the XML descriptor file inside an archive file (such as mod_missingmeta.zip) and use the Extension Manager to install it to the system. Bring up the Module Manager notice that the file isn t present in the initial list. By default, the Module Manager displays all of the site or front-end modules, but not the Administrator modules. Click the Administrator link, as shown in Figure 13-4. The list that appears will show the Missing Metadata Items module. Click the module name to bring up the editing screen. By default, a module is placed in the left position even if the Administrator template doesn t have a left position. Set the Position drop-down list to cpanel to display the module in the main Administrator Control Panel (see Figure 13-5). Click the Save button to store your changes in the database.
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