Joomla模块学习之后台mod_feed模块

Joomla模块学习之后台mod_feed模块

后台管理模块效果图

原理:

后台mod_feed模块通过在后台配置相应的信息.

如rssurl链接,rss结果数量,缓存时间等等,聚合相应的信息,达到用户配置的要求

 

 

配置界面:

 

 

 

mod_feed模块结构图:

 

 

关键代码

(modFeedHelper代码) $rssurl = $params->get('rssurl', ''); //RSS/RDF URL $rssitems = $params->get('rssitems', 5); //RSS显示数量 $rssdesc = $params->get('rssdesc', 1); //RSS描述 $rssimage = $params->get('rssimage', 1); //RSS图片 $rssitemdesc = $params->get('rssitemdesc', 1);//条目描述 $words = $params->def('word_count', 0); //限制字符长度 $rsstitle = $params->get('rsstitle', 1); //RSS标题 $rssrtl = $params->get('rssrtl', 0); //从右到左显示来源 $moduleclass_sfx = $params->get('moduleclass_sfx', ''); // get RSS parsed object // 缓存时间设置 $options = array(); $options['rssUrl'] = $rssurl; // 判断是否缓存 if ($params->get('cache')) { $options['cache_time'] = $params->get('cache_time', 15) ; $options['cache_time'] *= 60; } else { $options['cache_time'] = null; } // Rss聚合 $rssDoc =& JFactory::getXMLparser('RSS', $options);

(JFactory代码) function &getXMLParser( $type = 'DOM', $options = array()) { $doc = null; switch (strtolower( $type )) { case 'rss' : case 'atom' : { if (!is_null( $options['rssUrl'] )) { jimport ('simplepie.simplepie'); if(!is_writable(JPATH_BASE.DS.'cache')) { $options['cache_time'] = 0; } //真正聚合需要传递参数为rssUrl,缓存目录,缓存时间 $simplepie = new SimplePie( $options['rssUrl'], JPATH_BASE.DS.'cache', isset( $options['cache_time'] ) ? $options['cache_time'] : 0 ); $simplepie->force_feed(true); $simplepie->handle_content_type(); if ($simplepie->init()) { $doc = $simplepie; } else { JError::raiseWarning( 'SOME_ERROR_CODE', JText::_('ERROR LOADING FEED DATA') ); } } } break; ... return $doc; }

 

 

根据后台mod_feed设置,处理聚合返回结果

 

if ($rssDoc != false) { // channel header and link // 通道标题和链接 $channel['title'] = $rssDoc->get_title(); $channel['link'] = $rssDoc->get_link(); $channel['description'] = $rssDoc->get_description(); // channel image if exists // 通道图片 $image['url'] = $rssDoc->get_image_url(); $image['title'] = $rssDoc->get_image_title(); //image handling $iUrl = isset($image['url']) ? $image['url'] : null; $iTitle = isset($image['title']) ? $image['title'] : null; // items // 聚合内容列表 $items = $rssDoc->get_items(); // feed elements // 取出用户指定数量的items $items = array_slice($items, 0, $rssitems); ?> <table cellpadding="0" cellspacing="0" class="moduletable<?php echo $params->get('moduleclass_sfx'); ?>"> <?php // feed description if (!is_null( $channel['title'] ) && $rsstitle) { ?> <tr> <td> <strong> <a href="<?php echo str_replace( '&', '&', $channel['link']); ?>" target="_blank"> <?php echo $channel['title']; ?> </a> </strong> </td> </tr> <?php } // feed description if ($rssdesc) { ?> <tr> <td> <?php echo $channel['description']; ?> </td> </tr> <?php } // feed image if ($rssimage && $iUrl) { ?> <tr> <td align="center"> <img src="<?php echo $iUrl; ?>" alt="<?php echo @$iTitle; ?>"/> </td> </tr> <?php } $actualItems = count( $items ); $setItems = $rssitems; if ($setItems > $actualItems) { $totalItems = $actualItems; } else { $totalItems = $setItems; } ?> <tr> <td> <ul class="newsfeed<?php echo $moduleclass_sfx; ?>" > <?php for ($j = 0; $j < $totalItems; $j ++) { $currItem = & $items[$j]; // item title ?> <li> <?php if ( !is_null( $currItem->get_link() ) ) { ?> <a href="<?php echo $currItem->get_link(); ?>" target="_child"> <?php echo $currItem->get_title(); ?></a> <?php } // item description if ($rssitemdesc) { // item description $text = html_entity_decode($currItem->get_description()); $text = str_replace(''', "'", $text); // word limit check // 返回指定字节长度 if ($words) { $texts = explode(' ', $text); $count = count($texts); if ($count > $words) { $text = ''; for ($i = 0; $i < $words; $i ++) { $text .= ' '.$texts[$i]; } $text .= '...'; } } ?> <div style="text-align: <?php echo $rssrtl ? 'right': 'left'; ?> ! important"> <?php echo $text; ?> </div> <?php } ?> </li> <?php } ?> </ul> </td> </tr> </table> <?php }