WordPress Ajax 评论提交

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本文的附件来自于Fatesinger，但原文的附件已失联无法下载，还好我的主题还存留该文件，于是转载大发原文的部份内容，同时提供原来的附件文件，本文主要目的为技术文章和附件收藏，因为不知那天大发的博客完全“消失”，前几天就曾经出现无法访问。

首先说下使用ajax提交评论的好处，提升交互体验就不谈了，最重要的是可以防止垃圾评论，所以我们建议所有Wordpress用户来使用这个方法提交评论。要知道一般垃圾评论都是通过表单机器人提交的，如果使用了ajax评论提交我们就可以禁用wordpress的表单提交，也就是删除或者清空wp根目录下的wp-comment-post.php这个文件。

当然你可能会说我可以使用akismet插件啊，是的，你完全可以，但是这个插件一来会拖慢评论提交的速度，二来会在数据库中的commentmeta中插入大量的无用数据，所以强烈建议使用ajax评论提交。

此方法的优点：

  • 防止垃圾评论
  • 增强交互体验
  • 使用wordpress自带的admin-ajax.php进行数据提交
  • 支持评论修改，同时消除了匿名用户可篡改任意评论内容。

具体教程：

等待以及错误提示的小样式，请放在主题的CSS文件尾处。

#loading{padding:5px 0}
#loading img{margin-right:5px;vertical-align: middle;}
#error{padding:5px 0;color:#cc0000}
.ajax-notice {color: #FF6600;font-size: 12px;}

把以下代码加入到你的主题functions.php中，最后面的评论输出部分，找到你自己的评论回调函数，替换成你自己的。

//Ajax comments提交
//载入jquery库
//wp_enqueue_script( 'jquerylib', get_template_directory_uri() . '/js/jquery-1.10.2.min.js' , array(), '1.10.2', false);    
  wp_enqueue_script( 'base', get_template_directory_uri() . '/js/base.js', array(), '1.00', true);
  wp_localize_script('base', 'ajax', array(
            'ajax_url' => admin_url('admin-ajax.php'),
        ));
/*ajax comment submit*/
add_action('wp_ajax_nopriv_ajax_comment', 'ajax_comment');
add_action('wp_ajax_ajax_comment', 'ajax_comment');
function ajax_comment(){
    global $wpdb;
    //nocache_headers();
    $comment_post_ID = isset($_POST['comment_post_ID']) ? (int) $_POST['comment_post_ID'] : 0;
    $post = get_post($comment_post_ID);
    $post_author = $post->post_author;
    if ( empty($post->comment_status) ) {
        do_action('comment_id_not_found', $comment_post_ID);
        ajax_comment_err('Invalid comment status.');
    }
    $status = get_post_status($post);
    $status_obj = get_post_status_object($status);
    if ( !comments_open($comment_post_ID) ) {
        do_action('comment_closed', $comment_post_ID);
        ajax_comment_err('Sorry, comments are closed for this item.');
    } elseif ( 'trash' == $status ) {
        do_action('comment_on_trash', $comment_post_ID);
        ajax_comment_err('Invalid comment status.');
    } elseif ( !$status_obj->public && !$status_obj->private ) {
        do_action('comment_on_draft', $comment_post_ID);
        ajax_comment_err('Invalid comment status.');
    } elseif ( post_password_required($comment_post_ID) ) {
        do_action('comment_on_password_protected', $comment_post_ID);
        ajax_comment_err('Password Protected');
    } else {
        do_action('pre_comment_on_post', $comment_post_ID);
    }
    $comment_author       = ( isset($_POST['author']) )  ? trim(strip_tags($_POST['author'])) : null;
    $comment_author_email = ( isset($_POST['email']) )   ? trim($_POST['email']) : null;
    $comment_author_url   = ( isset($_POST['url']) )     ? trim($_POST['url']) : null;
    $comment_content      = ( isset($_POST['comment']) ) ? trim($_POST['comment']) : null;
  $edit_id              = ( isset($_POST['edit_id']) ) ? $_POST['edit_id'] : null; // 提取 edit_id
    $user = wp_get_current_user();
    if ( $user->exists() ) {
        if ( empty( $user->display_name ) )
            $user->display_name=$user->user_login;
        $comment_author       = $wpdb->escape($user->display_name);
        $comment_author_email = $wpdb->escape($user->user_email);
        $comment_author_url   = $wpdb->escape($user->user_url);
        $user_ID        = $wpdb->escape($user->ID);
        if ( current_user_can('unfiltered_html') ) {
            if ( wp_create_nonce('unfiltered-html-comment_' . $comment_post_ID) != $_POST['_wp_unfiltered_html_comment'] ) {
                kses_remove_filters();
                kses_init_filters();
            }
        }
    } else {
        if ( get_option('comment_registration') || 'private' == $status )
            ajax_comment_err('Sorry, you must be logged in to post a comment.');
    }
    $comment_type = '';
    if ( get_option('require_name_email') && !$user->exists() ) {
        if ( 6 > strlen($comment_author_email) || '' == $comment_author )
            ajax_comment_err( 'Error: please fill the required fields (name, email).' );
        elseif ( !is_email($comment_author_email))
            ajax_comment_err( 'Error: please enter a valid email address.' );
    }
    if ( '' == $comment_content )
        ajax_comment_err( 'Error: please type a comment.' );
    $dupe = "SELECT comment_ID FROM $wpdb->comments WHERE comment_post_ID = '$comment_post_ID' AND ( comment_author = '$comment_author' ";
    if ( $comment_author_email ) $dupe .= "OR comment_author_email = '$comment_author_email' ";
    $dupe .= ") AND comment_content = '$comment_content' LIMIT 1";
    if ( $wpdb->get_var($dupe) ) {
        ajax_comment_err('Duplicate comment detected; it looks as though you’ve already said that!');
    }
    if ( $lasttime = $wpdb->get_var( $wpdb->prepare("SELECT comment_date_gmt FROM $wpdb->comments WHERE comment_author = %s ORDER BY comment_date DESC LIMIT 1", $comment_author) ) ) {
        $time_lastcomment = mysql2date('U', $lasttime, false);
        $time_newcomment  = mysql2date('U', current_time('mysql', 1), false);
        $flood_die = apply_filters('comment_flood_filter', false, $time_lastcomment, $time_newcomment);
        if ( $flood_die ) {
            ajax_comment_err('You are posting comments too quickly.  Slow down.');
        }
    }
    $comment_parent = isset($_POST['comment_parent']) ? absint($_POST['comment_parent']) : 0;
    $commentdata = compact('comment_post_ID', 'comment_author', 'comment_author_email', 'comment_author_url', 'comment_content', 'comment_type', 'comment_parent', 'user_ID');

    if ( $edit_id )
{
    $comment_id = $commentdata['comment_ID'] = $edit_id;
    if( ihacklog_user_can_edit_comment($commentdata,$comment_id) )
    {  
        wp_update_comment( $commentdata );
    }
    else
    {
        ajax_comment_err( 'Cheatin’ uh?' );
    }

}
else
{
$comment_id = wp_new_comment( $commentdata );
}

    $comment = get_comment($comment_id);
    do_action('set_comment_cookies', $comment, $user);
    $comment_depth = 1;
    $tmp_c = $comment;
    while($tmp_c->comment_parent != 0){
        $comment_depth++;
        $tmp_c = get_comment($tmp_c->comment_parent);
    }
    $GLOBALS['comment'] = $comment;
    ?>
<li <?php comment_class(); ?> id="li-comment-<?php comment_ID(); ?>">
    <article id="comment-<?php comment_ID(); ?>" class="comment">
      <header class="comment-meta comment-author vcard">
        <?php
          echo get_avatar( $comment, 44 );
          printf( '<cite><b class="fn">%1$s</b> %2$s</cite>',
            get_comment_author_link(),
            // If current post author is also comment author, make it known visually.
            ( $comment->user_id === $post->post_author ) ? '<span>' . __( 'Post author', 'twentytwelve' ) . '</span>' : ''
          );
          printf( '<a href="%1$s"><time datetime="%2$s">%3$s</time></a>',
            esc_url( get_comment_link( $comment->comment_ID ) ),
            get_comment_time( 'c' ),
            /* translators: 1: date, 2: time */
            sprintf( __( '%1$s at %2$s', 'twentytwelve' ), get_comment_date(), get_comment_time() )
          );
        ?>
      </header><!-- .comment-meta -->

      <?php if ( '0' == $comment->comment_approved ) : ?>
        <p class="comment-awaiting-moderation"><?php _e( 'Your comment is awaiting moderation.', 'twentytwelve' ); ?></p>
      <?php endif; ?>

      <section class="comment-content comment">
        <?php comment_text(); ?>
        <?php edit_comment_link( __( 'Edit', 'twentytwelve' ), '<p class="edit-link">', '</p>' ); ?>
      </section><!-- .comment-content -->

    </article><!-- #comment-## -->

    <?php die();

}
function ajax_comment_err($a) {
    header('HTTP/1.0 500 Internal Server Error');
    header('Content-Type: text/plain;charset=UTF-8');
    echo $a;
    exit;
}

function ihacklog_user_can_edit_comment($new_cmt_data,$comment_ID = 0) {
    if(current_user_can('edit_comment', $comment_ID)) {
        return true;
    }
    $comment = get_comment( $comment_ID );
    $old_timestamp = strtotime( $comment->comment_date);
    $new_timestamp = current_time('timestamp');
    // 不用get_comment_author_email($comment_ID) , get_comment_author_IP($comment_ID)
    $rs = $comment->comment_author_email === $new_cmt_data['comment_author_email']
            && $comment->comment_author_IP === $_SERVER['REMOTE_ADDR']
                && $new_timestamp - $old_timestamp < 3600;
    return $rs;
}

请点击这里下载JS文件：js文件
js文件放到主题目录的js文件夹下，需要jq1.7版本以上，你可以使用不同方法来加载jquery库，强烈建议使用wp的wp_enqueue_script方法来加载js。

《WordPress Ajax 评论提交》有19个想法

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