calliko

Validation Plugin comments. The plugin is based on js-script jquery.validate. 
The plugin does not require any settings and works automatically for standard WordPress comments, of course, if you have a standard theme.

comment validation

Хороший простой плагин, работает из коробки ровно так, как ты и ожидаешь. 

Работает как ты ожидаешь

Validation Plugin comments. The plugin is based on js-script jquery.validate.

joern.zaefferer

Ever got annoyed when submitting a comment on a wordpress blog and just getting a blank page with a error message like “please fill out required fields” and nothing else? This plugin aims to help by adding validation to the comment form. When a user submits the form and something is missing, an appropiate message is displayed and individual fields are highlighted. When the email or url is in an incorrect format, a message is displayed accordingly.
Why should you install it? Because you care for comments and want to help users reduce mistakes that hold them off from commenting at all.
Whats the technology used? <a href="http://jquery.com" rel="nofollow ugc">jQuery</a> and the <a href="http://bassistance.de/jquery-plugins/jquery-plugin-validation/" rel="nofollow ugc">jQuery Validation plugin</a> with a few customizations to make it fit into the standard WordPress theme.
Is it compatible with other plugins? The plugin is tested with the <a href="https://wordpress.org/extend/plugins/draw-comments/" rel="ugc">Draw Comments</a> plugin and works, though the performance is slightly degraded. Other plugins haven’t yet been tested.

Comment Validation

This plugin adds client-side validation to the Wordpress comment form, using the jQuery validation plugin.

comment validation vs Comment Validation