Setting comment text as required

I want to set also text comment as required… but in the backend only email and author are possible.
Without using a javascript validation, how it is possible?
Thank you

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1 comment

  1. You can hook into 'pre_comment_on_post' and inspect $_POST['comment']:

    <?php # -*- coding: utf-8 -*-
    /**
     * Plugin Name: T5 Require comment text
     * Description: Dies if there is no comment text.
     * Plugin URI:  http://wordpress.stackexchange.com/q/55679/73
     * Version:     2012.07
     * Author:      Thomas Scholz
     * Author URI:  http://toscho.de
     * License:     MIT
     * License URI: http://www.opensource.org/licenses/mit-license.php
     */
    
    if ( ! function_exists( 't5_require_comment_text' ) )
    {
        add_action( 'pre_comment_on_post', 't5_require_comment_text' );
    
        function t5_require_comment_text()
        {
            if ( ! isset ( $_POST['comment'] ) or '' === trim( $_POST['comment'] ) )
            {
                print 'Please hit your back button and write something useful.';
                exit;
            }
        }
    }
    

    See wp-comments-post.php for more actions and a way to create a useful back link. I didn’t include one because some browsers restore all filled form fields when the user clicks the back button. A link would prevent this rather useful behavior.