一直对 WordPress 的 Ajax 交互研究感兴趣，也一直很关注于这方面的技术，谈到 WordPress Ajax 就不得不谈到评论 Ajax提交，作为一个博客、论坛评论的 Ajax 提交不仅可以改善用户体验，还可以大幅缩减服务器开支，毕竟输出单条评论内容比重新组织输出一个页面要简单的多。 虽说现在访问量一直比较低，不存在服务器压力的问题，但一向注重用户体验的我，当然不能放弃这么一个提升用户体验的机会。今天抽了一下午的空，把这个主题的 Ajax 评论提交初步完成了。
直接开门见山，直接上代码：（原理及思路在最后）
根据自己主题不同结构，以下代码请自行调整。
WordPress Ajax 提交评论 PHP 代码
在主题 function.php 文件中加入如下部分。
//以下大部分代码出自 yinheli 经由该部分代码，排除部分错误、优化精简得出以下代码。 //yinheli博客不做了，所以这里就不给链接了。 //Edited by XiangZi DEC.17TH 2011 function fail($s) {//虚拟错误头部分 header('HTTP/1.0 500 Internal Server Error'); echo $s; exit; } function ajax_post_comment_slow (){ fail('用不用说这么快？想好了再说！'); } //评论太快输出代码。 add_filter('comment_flood_trigger','ajax_post_comment_slow', 0); //挂一个评论太快，返回内容的钩子 function ajax_comment(){ // Ajax php 响应部分代码 if($_POST['action'] == 'ajax_comment') { global $wpdb, $db_check; // Check DB if(!$wpdb->dbh) { echo('Our database has issues. Try again later.'); die(); } nocache_headers(); $comment_post_ID = (int) $_POST['comment_post_ID']; $status = $wpdb->get_row("SELECT post_status, comment_status FROM $wpdb->posts WHERE ID = '$comment_post_ID'"); if ( empty($status->comment_status) ) { //这一套判断貌似抄的 wp 源代码 。详见：include/comment.php do_action('comment_id_not_found', $comment_post_ID); fail('The post you are trying to comment on does not currently exist in the database.'); } elseif ( 'closed' == $status->comment_status ) { do_action('comment_closed', $comment_post_ID);; fail('Sorry, comments are closed for this item.'); } elseif ( in_array($status->post_status, array('draft', 'pending') ) ) { do_action('comment_on_draft', $comment_post_ID); fail('The post you are trying to comment on has not been published.'); } $comment_author = trim(strip_tags($_POST['author'])); $comment_author_email = trim($_POST['email']); $comment_author_url = trim($_POST['url']); $comment_content = trim($_POST['comment']); // If the user is logged in $user = wp_get_current_user(); if ( $user->ID ) { $comment_author = $wpdb->escape($user->display_name); $comment_author_email = $wpdb->escape($user->user_email); $comment_author_url = $wpdb->escape($user->user_url); if ( current_user_can('unfiltered_html') ) { if ( wp_create_nonce('unfiltered-html-comment_' . $comment_post_ID) != $_POST['_wp_unfiltered_html_comment'] ) { kses_remove_filters(); // start with a clean slate kses_init_filters(); // set up the filters } } } else { if ( get_option('comment_registration') ) fail('火星人？注册个?'); } $comment_type = ''; if ( get_option('require_name_email') && !$user->ID ) { if ( 6> strlen($comment_author_email) || '' == $comment_author ) fail('Oopps,名字[Name]或邮箱[email]不对。'); elseif ( !is_email($comment_author_email)) fail('Oopps,邮箱地址[Email]不对。'); } if ( '' == $comment_content ) fail('是不是应该写点什么再提交？'); // Simple duplicate check $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) ) { fail('评论重复了!有木有!'); } $commentdata = compact('comment_post_ID', 'comment_author', 'comment_author_email', 'comment_author_url', 'comment_content', 'comment_type', 'user_ID'); if( !$user->ID ){ $result_set = $wpdb->get_results("SELECT display_name, user_email FROM $wpdb->users WHERE display_name = '" . $comment_author . "' OR user_email = '" . $comment_author_email . "'"); if ($result_set) { if ($result_set[0]->display_name == $comment_author){ fail('博主你也敢冒充？'); } else { fail('博主你也敢冒充？'); } } } $comment_id = wp_new_comment( $commentdata ); $comment = get_comment($comment_id); if( !$user->ID ){ setcookie('comment_author_' . COOKIEHASH, $comment->comment_author, time() + 30000000, COOKIEPATH, COOKIE_DOMAIN); setcookie('comment_author_email_' . COOKIEHASH, $comment->comment_author_email, time() + 30000000, COOKIEPATH, COOKIE_DOMAIN); setcookie('comment_author_url_' . COOKIEHASH, clean_url($comment->comment_author_url), time() + 30000000, COOKIEPATH, COOKIE_DOMAIN); } @header('Content-type: ' . get_option('html_type') . '; charset=' . get_option('blog_charset')); xz_comment($comment, null);//这是我的调用评论函数，换成你的函数名。 die(); } } add_action('init', 'ajax_comment');
Javascript 中代码
注意：以下代码需要 Jquery 框架支援。
javascript onload 代码中加入以下部分。