Displaying a message to the user after he started an action belongs to a good usability. In the era of Web 2.0 applications, the user is expecting such optical signal after his actions. Also WordPress Plugin developer should give the user a result message, if necessary, provided with further information.
The WordPress admin area often likes to show information at the top of the window. For developers, this has a great benefit: Tools for generating the error and information messages are integrated and can easily be implemented in Plugins - without any self-definitions or changes in the style sheet.
Automatically generated information in WordPress
wp_safe_redirect( add_query_arg( 'updated', 'true', wp_get_referer() ) );
Manual and more flexible solution to output a message box
<div id="message" class="updated"> <p> Output </p> </div>
Colorful: The availability of CSS classes
Messages within an application have to communicate different informations. For this purpose WordPress has numerous stylesheet classes available, which suits best to the message.
<div id="message" class="updated">...</div>
<div id="message" class="error">...</div>
<div id="message" class="updated highlight">...</div>
<div id="message" class="updated below-h2">...</div>
Don't use your own format. A common and familiar message box provides trust and increases the potential of perception.
This post is written by Sergej Müller wpseo.org, who created the popular WordPress Plugin to optimize your SEO.
Thank you very much from our part to Sergej.
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