Validating Custom Meta Box Values & Required Fields
The easiest way is to add Javascript validation via the jQuery Validate plugin. Here’s the most basic walkthrough: Near your add_meta_box call, enqueue the jQuery Validate plugin as well as a JS file for your simple script: add_action(‘admin_enqueue_scripts’, ‘add_my_js’); function add_my_js(){ wp_enqueue_script(‘my_validate’, ‘path/to/jquery.validate.min.js’, array(‘jquery’)); wp_enqueue_script(‘my_script_js’, ‘path/to/my_script.js’); } Then in my_script.js include the following: jQuery().ready(function() { … Read more