WordPress Ajax 提交评论的实现思路与方法
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.
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:
-
-
-
- function fail($s) {
- header('HTTP/1.0 500 Internal Server Error');
- echo $s;
- exit;
- }
- function ajax_post_comment_slow (){
- fail('用不用说这么快?想好了再说!');
- }
-
- add_filter('comment_flood_trigger','ajax_post_comment_slow', 0);
-
- function ajax_comment(){
-
- if($_POST['action'] == 'ajax_comment') {
- global $wpdb, $db_check;
-
- if(!$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 ( emptyempty($status->comment_status) ) {
-
- 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']);
-
- $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();
- kses_init_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?');
-
- $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 = '" . $comment_author_email . "'");
- if ($r(www.111cn.net)esult_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($comment, null);
- die();
- }
- }
- add_action('init', 'ajax_comment');
Javascript 中代码,注意,以下代码需要 Jquery 框架支援,javascript onload 代码中加入以下部分:
- if (jQuery('#commentform').length) {
- jQuery('#commentform').submit(function(){
-
-
- var ajaxCommentsURL = window.location.href;
- jQuery.ajax({
- url: ajaxCommentsURL,
- data: jQuery('#commentform').serialize()+'&action=ajax_comment',
- type: 'POST',
- beforeSend: function() {
- jQuery('#commenterror').hide();
- jQuery('#commentload').fadeIn();
- },
- error: function(request) {
- jQuery('#commenterror').html(request.responseText);
- jQuery('#commentload').hide();
- jQuery('#commenterror').fadeIn();
- },
- success: function(data) {
- jQuery('textarea').each(function(){
- this.value='';
- });
- jQuery('#commenterror').fadeOut();
- if(jQuery(".commentlist li.comment").first().length != 0){jQuery(".commentlist li.comment").first().before(data)}
- else {jQuery("ol.commentlist").append(data)}
- jQuery(".commentlist li.comment").first().hide(0,function(){$(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;
- } );
- }
注:代码仍有改进需求,因为没有时间,所以就没有再进化.
CSS 代码,css 随意部分添加:
- #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 ;
- }
原理、思路
原理:Javascript 提交数据,php响应并输出结果,Javascript 得到结果并显示.
思路:点击提交按钮后,Javascript 截获提交动作,截获提交的各项数据(Name、Email、Web、Comment-text)利用 Javascript Jquery 模拟浏览器提交POST(Name、Email、Web、Comment-text)请求之WordPress,Function.php 文件中构造一个接受请求的函数,即本列中ajax_comment函数,如果请求无错误,输出正确结果,如果请求有错误,输出错误结果,Javascript 获得正确结果,动态添加到评论列表中,Javascript 获得错误结果,动态添加到提交提示栏.
改进:提交按钮在点击至获得返回结果后3秒的时间里应该都是变灰失效状态,这一点之前因为在本机测试,提交瞬间完成没有注意到,远程测试的时候发现了,但要改的话还要进行测试,时间太紧就不改了,有机会再改进一下.
总结:因为 WordPress 主题中评论样式的自由性、多样性,所以貌似至今一直没有一款通用性的AJAX 评论插件,一些高手也只能在优化自己博客之余,把思路和部分通用核心代码做一下公布,所以想要实现一些炫酷的功能要不有高人帮你,要不你就只能好好学代码,期待有一日能够厚积薄发了,效果请自行提交评论验证.