Add Comment Custom Field

2 comments

1. Here you go: Adding Custom Fields to WordPress Comment Forms?

   And another awesome post on this: http://wpengineer.com/2214/adding-input-fields-to-the-comment-form/

   Functions are available to add/update, delete comment meta, similar to post and user meta.

   Edit:
   Here’s an example to give you a start (put the code into the functions.php or in a custom plugin):

   Add the fields to comment form:

   add_filter( 'comment_form_defaults', 'change_comment_form_defaults');
   function change_comment_form_defaults( $default ) {
       $commenter = wp_get_current_commenter();
       $default[ 'fields' ][ 'email' ] .= '<p class="comment-form-author">' .
                                               '<label for="city">'. __('City') . '</label>
                                           <span class="required">*</span>
                                           <input id="city" name="city" size="30" type="text" /></p>';
       return $default;
   }
   

   4 functions to retrieve/add/update/delete comment meta:

   get_comment_meta( $comment_id, $meta_key, $single = false );
   add_comment_meta($comment_id, $meta_key, $meta_value, $unique = false );
   update_comment_meta($comment_id, $meta_key, $meta_value, $unique = false );
   delete_comment_meta( $comment_id, $meta_key, $single = false );
   

   This is where you’d do the validations:

   add_filter( 'preprocess_comment', 'verify_comment_meta_data' );
   function verify_comment_meta_data( $commentdata ) {
       if ( ! isset( $_POST['city'] ) )
           wp_die( __( 'Error: please fill the required field (city).' ) );
       return $commentdata;
   }
   

   And save the comment meta:

   add_action( 'comment_post', 'save_comment_meta_data' );
   function save_comment_meta_data( $comment_id ) {
       add_comment_meta( $comment_id, 'city', $_POST[ 'city' ] );
   }
   

   Retrieve and display comment meta:

   add_filter( 'get_comment_author_link', 'attach_city_to_author' );
   function attach_city_to_author( $author ) {
       $city = get_comment_meta( get_comment_ID(), 'city', true );
       if ( $city )
           $author .= " ($city)";
       return $author;
   }
   

   (Note: All the code is from the WPengineer link I posted above. There are more details and advanced usages in that post, please check them too! )

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2. This slideshow from Beau Lebens should be able to show you how:
   Hooking into Comments

   And this blog post from Otto should be able to show you more:
   WordPress 3.0 Theme Tip: The Comment Form

   There is also a basic plugin available here called “WordPress Plugin: Extra Comment Fields” (sorry can’t post the link).

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