WordPress中利用AJAX技术进行评论提交的实现示例

//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 2011function 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');

if (jQuery('#commentform').length) {  jQuery('#commentform').submit(function(){  // 截获提交动作//ID为 commentform 的表单提交时发生的函数，也就是整个留言输入框 form 的ID。 var ajaxCommentsURL = window.location.href;    jQuery.ajax({      url: ajaxCommentsURL,      data: jQuery('#commentform').serialize()+'&action=ajax_comment',        type: 'POST',      beforeSend: function() {        jQuery('#commenterror').hide();        jQuery('#commentload').fadeIn();      },      error: function(request) {  //发生错误时        jQuery('#commenterror').html(request.responseText);        jQuery('#commentload').hide();  //隐藏 submit        jQuery('#commenterror').fadeIn(); //显示 error       },      success: function(data) {        jQuery('textarea').each(function(){          this.value='';        });        jQuery('#commenterror').fadeOut();        if(jQuery(".commentlist li.comment").first().length != 0){jQuery(".commentlist li.comment").first().before(data)}          else {jQuery("ol.commentlist").append(data)}        jQuery(".commentlist li.comment").first().hide(0,function(){$(this).slideDown(1000)});        jQuery('#cmt-submit').attr('disabled', true).css({"background-color":"#6C6C6C","color":"#E0E0E0"});        jQuery('#commentload').fadeOut(1600); setTimeout(function() {        jQuery('#cmt-submit').removeAttr('disabled').css({"background-color":"#0086C5","color":"#FFFFFF"});        },3000);       }    });    return false;  } );}

#commentload,#commenterror{ display: none; margin: 5px 0 0 0; color:#D29A04; float: left; font-size:16px; padding:0 0 0 20px;}#commentload{ background: url("img/loading.gif") no-repeat bottom left ;}#commenterror{ background: url("img/error.png") no-repeat bottom left ;}