danielbitzer

This is a very simple WordPress plugin for creating frontend notices server side or client side. There are 4 notice types by default success, error, warning, general or you can create custom notice types. Server side notices are stored in the session until displayed.
This plugin hopes to one day solve the problem of complex WordPress sites with multiple plugins all having their own Notices that all require styling.
But for now, the Notices API is useful tool for developers creating custom functionality in their theme.
Server Side Usage
<pre><code><?php
 WP_Notices::success( $title, $message, $timer, $priority ); 
 WP_Notices::warning( 'Login Failed', 'You have entered an incorrect Username or password, please try again.'); 
 WP_Notices::error( $title, $message, $timer, $priority ); 
 WP_Notices::general( $title, $message, $timer, $priority ); 
 WP_Notices::custom( $type, $title, $message, $timer, $priority );
?>
</code></pre>
Client Side Usage
<pre><code>jQuery(document).ready(function($){

 $.WP_Notices.success( title,message, scroll_to, timer, callback );
 $.WP_Notices.error( title, message, scroll_to, timer, callback );
 $.WP_Notices.general( title, message, scroll_to, timer, callback );
 $.WP_Notices.warning( title, message, scroll_to, timer, callback );

 // Custom type
 $.WP_Notices.render_notice( type, title, message, scroll_to, timer, callback );

 // Using the callback parameter
 $.WP_Notices.warning( 'Form Error', 'Invalid form input.', false, 3000, function( $notice ) {
 console.log( $notice );
 });

});
</code></pre>
Options
<pre><code>add_filter( 'notice_api_options', 'customize_notice_options' );

function customize_notice_options( $options )
{
 $options = array(
 'prepend_selector' => '#content',
 'container_class' => 'notices-container',
 'before_title' => '',
 'after_title' => ': ',
 'scrolling_speed' => 500,
 );
 return $options;
}
</code></pre>

Notices API

The simple Notices API currently missing in WordPress.

Stephen Harris

This plug-in will only work on a Multisite running WordPress 3.9+.
This plug-in allows an Network Admin to create admin notices that appear on the top of all admin screens of the 
network’s sites. This notices are styled identically to the “normal” WordPress notices that you might see (WordPress 
updates, “post published” messages etc). Additionally each notice has a “dismiss” link which allows the user to 
instantly dismiss the notice.
Once a user dismisses a notice there will never again see that notice, on any of the network’s site.
Health Warning: The notice messages are considered HTML! A “small” inline tinyMCE editor will be used in a 
future update. But for the time being be aware that when you create/edit notices you are editing HTML (think WordPress 
‘text’ tab on the editor).
Before using the support forums, please read the FAQ. Thank you!

Multisite Admin Notices

Allows a network admin to create admin notices for blog admins.

Notices API vs Multisite Admin Notices