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。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( !$user->ID ){
setcookie('commentauthor' . COOKIEHASH,$comment->comment_author,time() + 30000000,COOKIEPATH,COOKIE_DOMAIN);
setcookie('comment_authoremail' . COOKIEHASH,$comment->comment_author_email,COOKIE_DOMAIN);
setcookie('comment_authorurl' . COOKIEHASH,clean_url($comment->comment_author_url),COOKIE_DOMAIN);
}
@header('Content-type: ' . get_option('html_type') . '; charset=' . get_option('blog_charset'));
xz_comment($comment,null);//这是我的调用评论函数，换成你的函数名。
die();
}
}
add_action('init','ajax_comment');
Javascript 中代码
注意：以下代码需要 Jquery 框架支援。 javascript onload 代码中加入以下部分。函数，也就是整个留言输入框 form 的ID。
var ajaxCommentsURL = window.location.href;
jQuery.ajax({
url: ajaxCommentsURL,data: jQuery('#commentform').serialize()+'&action=ajax_comment',type: 'POST',beforeSend: function() {
jQuery('#commenterror').hide();
jQuery('#commentload').fadeIn();
},error: function(request) { //发生错误时
jQuery('#commenterror').html(request.responseText);
jQuery('#commentload').hide(); //隐藏 submit
jQuery('#commenterror').fadeIn(); //显示 error
},success: function(data) {
jQuery('textarea').each(function(){
this.value='';
});
jQuery('#commenterror').fadeOut();
if(jQuery(".commentlist li.comment").first().length != 0){jQuery(".commentlist li.comment").first().before(data)}
else {jQuery("ol.commentlist").append(data)}
jQuery(".commentlist li.comment").first().hide(0,function(){$(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;
} );
}
注：代码仍有改进需求，因为没有时间，所以就没有再进化。
