The official CMS 3.4 API page of Joomla classifies the JError class and all its methods as deprecated, yet I couldn't find any alternative to output messages when i.e. there is an error after server side validation for a specific component etc... Are we meant to use those deprecated methods or are there other more recommended ways of displaying these useful error/warning messages?


You can use enqueueMessage to display errors, for example:

$user = JFactory::getUser();

if ($user->guest)
    $msg = 'You must be logged in';
    JFactory::getApplication()->enqueueMessage($msg, 'error');    // red 
    JFactory::getApplication()->enqueueMessage($msg, 'warning');  // yellow
    JFactory::getApplication()->enqueueMessage($msg, 'notice');   // blue
    JFactory::getApplication()->enqueueMessage($msg, 'message');  // green

If you wish to store errors in logs files, you can use JLog, like so:


JLog::add(JText::_('JTEXT_ERROR_MESSAGE'), JLog::WARNING, 'jerror');

You can also use PHP exceptions to catch errors, like so:

// Perform a database query or something here
    // Try to get an object based on the results from the database
    $results = $db->loadObjectList();
catch (Exception $e)
    // Start crying cause it didn't work
    echo $e->getMessage();
  • that's really cool, but will the output contain any class so I can tailor the look and feel of the message box depending on the type of message? i.e. red for error, yellow for warning etc.. – Mg Gm Mar 14 '15 at 18:26
  • @MgGm - Yes, this is possible, I've updated my answer showing how to do this – Lodder Mar 14 '15 at 18:29

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