how to implment admin part Ajax using WP_List_Table?

I am new in wordpress if someone will help me I will be very appreciate.

There is parameter ajax “true” but in docs. wasn’t said how to implement Ajax using WP_List_Table Class?

parent::__construct( array(
            'singular'  => 'user',     //singular name of the listed records
            'plural'    => 'users',    //plural name of the listed records
            'ajax'      => true        //does this table support ajax?
        ) );