If you want to add a validation on featured image from the post add/edit screen, then keep your close attention in this tutorial as I am going to share a simple WordPress snippet to require a featured image before you can publish post.
Copy the below code and use it at the end of your theme’s functions.php file. Below code will make featured image as required to Publish your post.
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add_action('save_post', 'wpds_check_thumbnail'); add_action('admin_notices', 'wpds_thumbnail_error'); function wpds_check_thumbnail($post_id) { // change to any custom post type if(get_post_type($post_id) != 'post') return; if ( !has_post_thumbnail( $post_id ) ) { // set a transient to show the users an admin message set_transient( "has_post_thumbnail", "no" ); // unhook this function so it doesn't loop infinitely remove_action('save_post', 'wpds_check_thumbnail'); // update the post set it to draft wp_update_post(array('ID' => $post_id, 'post_status' => 'draft')); add_action('save_post', 'wpds_check_thumbnail'); } else { delete_transient( "has_post_thumbnail" ); } } function wpds_thumbnail_error() { // check if the transient is set, and display the error message if ( get_transient( "has_post_thumbnail" ) == "no" ) { echo "<div id='message' class='error'><p><strong>You must select Featured Image. Your Post is saved but it can not be published. </strong></p></div>"; delete_transient( "has_post_thumbnail" ); } } |
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