A bunch of tips and snippets

Some useful and official articles about Joomla layout and output overrides

• Understanding Output Overrides

• How to override the output from the Joomla! core

• Layout Overrides in Joomla

• How to correctly override the info block for an article?

• Language Overrides in Joomla 3.x

• How to override the component mvc from the Joomla! core

• Adding custom fields/Overrides

Some useful videos about Joomla overrides

Some useful php codes for your overrides

1. Print_r

   print_r — Prints human-readable information about a variable

   <?php
   /**
    * @package     Joomla.Site
    * @subpackage  mod_articles_archive
    *
    * @copyright   Copyright (C) 2005 - 2019 Open Source Matters, Inc. All rights reserved.
    * @license     GNU General Public License version 2 or later; see LICENSE.txt
    */
   
   defined('_JEXEC') or die;
   ?>
   <?php if (!empty($list)) : ?>
     
   	<ul class="archive-module<?php echo $moduleclass_sfx; ?> mod-list">
     
   	<?php foreach ($list as $item) : ?>
         
       <div>
         <pre>
           <?php print_r($item);?>
         </pre>
         </div>
                 
   	<?php endforeach; ?>
         
   </ul>
   <?php endif; ?>
   

2. Display the intro image of an article

   <?php
   	$article_images  = json_decode($item->images);
   	$article_image   = '';
   	$article_image_alt   = '';
   	if(isset($article_images->image_intro) && !empty($article_images->image_intro)) {
   		$article_image  = $article_images->image_intro;
   		$article_image_alt  = $article_images->image_intro_alt;
   	}?>  					
   		
   	<a href="/<?php echo $item->link; ?>">
   		<img class="" src="/<?php echo $article_image; ?>" alt="<?php echo $article_image_alt; ?>" >
   	</a>

3. Display custom fields in an override 

   <?php $customFields = FieldsHelper::getFields('com_content.article', $this->item, true);
   		foreach ($customFields as $customField){
   		$customFields[$customField->name] = $customField;
   	}?> 
   	
   	
   <p><?php echo $customFields['name-of-the-custom-field']->value; ?></p>

4. Display the number of articles in a category

   <?php 
   $model = JModelLegacy::getInstance('Articles', 'ContentModel', array( 'ignore_request' => true )); 
   $params = JFactory::getApplication()->getParams();
   $model->setState('params', $params);
   $model->setState('filter.category_id', xxxx); // xxxx category ID 
   $num_articles = $model->getTotal();
   ?>
   
   <p><?php echo $num_articles; ?></p>

5. Truncate the introtext

   <?php echo JHTML::_('string.truncate', $item->introtext, 100, false, false) ; ?>
   

6. Display the name of the site

   <?php
   $config = JFactory::getConfig();
   echo 'Site name is ' . $config->get( 'sitename' ); 
   ?>

7. Display images from weblink component

   <?php $images = json_decode($item->images); ?>
   <?php  if (isset($images->image_first) and !empty($images->image_first)) : ?>
   <div class="img-intro pull-<?php echo htmlspecialchars($images->float_first); ?>"> 
   	<img src="/<?php echo $images->image_first; ?>" />
   </div>
   <?php endif; ?>
                     
   <?php  if (isset($images->image_second) and !empty($images->image_second)) : ?>
   <div class="img-thumbnail img-intro pull-<?php echo htmlspecialchars($images->float_second); ?>"> 
   	<img src="/<?php echo htmlspecialchars($images->image_second); ?>" />
   </div>
   <?php endif; ?>

8. Display the number of articles

   <?php if ($params->get('numitems')) : ?>
   (<?php echo $item->numitems; ?> articles)
   <?php endif; ?>
   

9. Display the category name

   <?php echo $item->displayCategoryTitle; ?>
   

10. Display the content of URL A field

    <?php echo $item->urls->get('urlatext'); ?>
    

11. Display the image of the category

    <img src="<?php echo $item->getParams()->get('image') ?>" class=""/>