CHECK IF TEXTBOX IS EMPTY function alwk_error_empty_textbox($input) { if (empty($input)) { // IF TRUE -> ERROR NOTICE $type = 'error'; $message = __( 'Textbox is empty!', 'alerter'); add_settings_error('alwk_text', esc_attr( 'settings-updated' ), $message, $type ); } return $input; } add_action('admin_notices', ' alwk_error_empty_textbox'); /*The options page*/ function alwk_setting_page() { ?>

	'alwk_options[alert]'); wp_editor( $alwk_options[ 'alert' ], 'alwk_options[alert]', $args ); ?>



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[alerter] in a post or page.', 'alerter'); ?>