How to display Notices and Error Messages using the Joomla! API

Errors, warnings and notices can be displayed at any time within any custom component, module and plugin.

Ensure that you have the following code inside your Joomla! template where you would like the errors, warnings and notices displayed.

<jdoc:include type="message" />

To display a Message user the following code within your Component, Module or Plugin

JFactory::getApplication()->enqueueMessage('Your Message');

To raise a notice use the following code

JError::raiseNotice( 100, 'Your Notice' );

To display a Warning use the following

JError::raiseWarning( 100, 'This is a Warning' );

To display an Error

JError::raiseError( 4711, 'A error occurred' );

Since Joomla! 3.x uses bootstraped templates, standard bootstrap CSS styles for Alerts will be used

JFactory::getApplication()->enqueueMessage('Your Message', 'type');

In the above type can be one of

To display a error use the example below

JFactory::getApplication()->enqueueMessage('ERROR', 'error');

For more information click here