[Aron Prins]

Hey everyone,

While working on our WP Knowledgebase Plugin I wanted to add a feature that allowed a single post in a specific custom post type to display up or down vote buttons below the_content.

Here’s the two functions we’re currently using on our WP Knowledgebase Plugin:

/**
 * Adds a vote form after the_content
 */
function wpkb_add_vote_form( $content ) {
  global $post;
  if ( is_singular( 'knowledgebase' ) && get_post_type() === 'knowledgebase' ) {
    $vote_count = get_post_meta( $post->ID, 'article_vote_count', true );
    if ( empty( $vote_count ) ) {
      $vote_count = 0;
    }

    $vote_form = '<form method="post">';
    $vote_form .= '<button type="submit" name="article_vote_type" value="upvote">?</button>&nbsp;';
    $vote_form .= '<button type="submit" name="article_vote_type" value="downvote">?</button>';
    $vote_form .= '</form>';
    $vote_form .= '<p>Vote count: ' . $vote_count . '</p>';

    // Check if the user has voted and prevent them from voting again
    $has_voted = false;
    $vote_cookie_name = 'knowledgebase_vote_' . $post->ID;
    if ( isset( $_COOKIE[ $vote_cookie_name ] ) ) {
      $has_voted = true;
    }

    if ( $has_voted ) {
      $vote_form = '<p>Vote count: ' . $vote_count . '</p>';
    }

    return $content . $vote_form;
  }

  return $content;
}

add_filter( 'the_content', 'wpkb_add_vote_form' );

/**
 * Processes a vote if a up or down button is clicked.
 */
function wpkb_process_vote() {
  if ( isset( $_POST['article_vote_type'] ) ) {
    add_action( 'wp', function() {
      $vote_type = sanitize_text_field( $_POST['article_vote_type'] );
      if ( $vote_type === 'upvote' || $vote_type === 'downvote' ) {
        $post_id = get_the_ID();

        $vote_count = get_post_meta( $post_id, 'article_vote_count', true );
        if ( empty( $vote_count ) ) {
          $vote_count = 0;
        }

        // Check if the user has voted and prevent them from voting again
        $has_voted = false;
        $vote_cookie_name = 'knowledgebase_vote_' . $post_id;
        if ( isset( $_COOKIE[ $vote_cookie_name ] ) ) {
          $has_voted = true;
        }

        if ( ! $has_voted ) {
          if ( $vote_type === 'upvote' ) {
            $vote_count++;
          } else {
            $vote_count--;
          }

          update_post_meta( $post_id, 'article_vote_count', $vote_count );

          // Set the vote cookie
          setcookie( $vote_cookie_name, $vote_type, time() + 3600, '/' );
        }
      }
    } );
  }
}
add_action( 'init', 'wpkb_process_vote' );

Feel free to use them in your plugin (credit is always appreciated) or your theme!

Cheers,
Aron

• This topic was modified 1 year, 9 months ago by Aron Prins.
• This topic was modified 1 year, 9 months ago by Aron Prins.