wordpress 為主題添加AJAX提交評論功能的php代碼

2020-03-22 16:29:59

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首先需要在主題的function.php文件里添加一段函數：

復制代碼代碼如下:
?php
function fail($s) {
header('HTTP/1.0 500 Internal Server Error');
echo $s;
exit;
}
function ajax_comment(){
if($_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) ) {
do_action('comment_id_not_found', $comment_post_ID);
fail('The post you are trying to comment on does not html' target='_blank'>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('Sorry, you must be logged in to post a comment.');
}
$comment_type = '';
if ( get_option('require_name_email') !$user- ID ) {
if ( 6 strlen($comment_author_email) || '' == $comment_author )
fail('Sorry: please fill the required fields (name, email).');
elseif ( !is_email($comment_author_email))
fail('Sorry: please enter a valid email address.');
}
if ( '' == $comment_content )
fail('Sorry: please type a comment.');
// 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('Duplicate comment detected; it looks as though you/'ve already said that!');
}
$commentdata = compact('comment_post_ID', 'comment_author', 'comment_author_email', 'comment_author_url', 'comment_content', 'comment_type', 'user_ID');
if( !$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( __('Error: you are not allowed to use the nickname that you entered.if you are the administrator you hava to login to comment.','philna2') );
} else {
fail( __('Error: you are not allowed to use the email that you entered.if you are the administrator you hava to login to comment.','philna2') );
}
}
}
$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'));
?
//這里需要粘貼你的評論框架代碼，不過相關的調用代碼有所變化：
//評論ID：$comment- comment_ID
//評論者名字：$comment- comment_author
//判斷評論者是否填寫了網站地址：$comment- get_comment_author_url
//評論者URL：$comment- comment_author_url
//評論時間：mysql2date(__('F jS, Y'),$comment- comment_date)
//評論者e-mail：$comment- comment_author_email
//評論內容$comment- comment_content
?php
die();
}
}
add_action('init', 'ajax_comment');
//添加AJAX評論鉤子
?

如果處理評論內容里的換行符的話，$comment- comment_content需做以下處理：

復制代碼代碼如下:
?php
$aj_order = array("/r/n", "/n", "/r");
$aj_comment_content = str_replace($aj_order,'
',$comment- comment_content);
echo $aj_comment_content;
?

用jQuery寫提交評論時的腳本，這也是關鍵的部分：

復制代碼代碼如下:
jQuery(document).ready(function() {
if (jQuery('#commentform').length) {
jQuery('#commentform').submit(function(){ //ID為 commentform 的表單提交時發生的函數，也就是整個留言輸入框 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();
var submit=' div id="commentload" img/spinner.gif") no-repeat scroll 0 50%;margin: 0 auto;" Submitting Comment... /div //創建名為 submit 的字符串，稍后插入，這里的樣式大家自己根據需要定義，那個背景圖片自己去下哈。
var error=' div id="commenterror" Posted comment fail. /div //創建名為 error 的字符串
jQuery('#comments').after(submit); // 在ID為 comments 的元素后插入剛定義的 submit
jQuery('#comments').after(error); // 同樣插入剛定義的 error
jQuery('#commentload').slideDown(); // 讓submit 向下滑出
},
error: function(request) { //發生錯誤時
jQuery('#commentload').hide(); //隱藏 submit
jQuery('#commenterror').show("slow").html(request.responseText); //顯示 error
},
success: function(data) {
jQuery('textarea').each(function(){
this.value='';
});
jQuery('#commenterror').hide().html();
if (!jQuery('#thecomments').length) {
jQuery('#pinglist').before(' ol id="thecomments" /ol }
jQuery('#thecomments').append(data); //向ID為 thecomments 的元素添加數據，也就是整個 ol 或 ul
var new_comment = jQuery('#thecomments li:last').hide(); //讓最新添加的數據隱藏
new_comment.slideDown(1000); //再顯示，這里是為了實現滑出的效果，不想要也可以直接顯示
jQuery('#commentform:input').attr('disabled', true);
jQuery('#commentload').slideUp("slow");
jQuery('#messagebox').slideUp("slow"); //這是針對我模版而加的，因為我模版在沒有留言時會有個 nocomment 的元素，我要讓添加一條留言后他自動隱藏，要不然會矛盾，呵呵，這個可以自行選擇要或不要
setTimeout(function() {
jQuery('#commentform:input').removeAttr('disabled');
}, 10000); //這里是設置10秒之后才可以再次留言，自行設置，單位毫秒。
}
});
return false;
} );
}})

注意：
腳本里的對象ID要對應主題里的評論相關框架的ID。
后續步驟：
為commentload，commenterror寫CSS。
有待完善的地方：
AJAX提交后的評論序號顯示為1。
更多編程語言

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