简单实用方便的ajax评论完整代码

简单的ajax评论完整代码

数据库结构CREATE TABLE `comments` (

`id` int(10) unsigned NOT NULL auto_increment,

`name` varchar(128) collate utf8_unicode_ci NOT NULL default '',

`url` varchar(255) collate utf8_unicode_ci NOT NULL default '',

`email` varchar(255) collate utf8_unicode_ci NOT NULL default '',

`body` text collate utf8_unicode_ci NOT NULL,

`dt` timestamp NOT NULL default CURRENT_TIMESTAMP,

PRIMARY KEY  (`id`)

) ENGINE=MyISAM  DEFAULT CHARSET=utf8 COLLATE=utf8_unicode_ci AUTO_INCREMENT=1;

演示

PHP 

<?php// Error reporting:error_reporting(E_ALL^E_NOTICE);include "conn.php";include "comment.class.php";/* （PS：^_^不错的php学习交流群：276167802，验证：csl，有兴趣的话可以加入进来一起讨论）/   Select all the comments and populate the $comments array with objects*/$comments = array();$result = mysql_query("SELECT * FROM comments ORDER BY id ASC");while($row = mysql_fetch_assoc($result)){$comments[] = new Comment($row);}?>

PHP 

<div id="main"><?php/*/   Output the comments one by one:*/foreach($comments as $c){echo $c->markup();}?><div id="addCommentContainer"><p>Add a Comment</p><form id="addCommentForm" method="post" action=""><div><label for="name">Your Name</label><input type="text" name="name" id="name" /><label for="email">Your Email</label><input type="text" name="email" id="email" /><label for="url">Website (not required)</label><input type="text" name="url" id="url" /><label for="body">Comment Body</label><textarea name="body" id="body" cols="20" rows="5"></textarea><input type="submit" id="submit" value="Submit" /></div></form></div></div>submit.php

PHP 

<?php// Error reporting:error_reporting(E_ALL^E_NOTICE);include "conn.php";include "comment.class.php";/*/   This array is going to be populated with either/   the data that was sent to the script, or the/   error messages./*/$arr = array();$validates = Comment::validate($arr);if($validates){/* Everything is OK, insert to database: */mysql_query("   INSERT INTO comments(name,url,email,body)VALUES ('".$arr['name']."','".$arr['url']."','".$arr['email']."','".$arr['body']."')");$arr['dt'] = date('r',time());$arr['id'] = mysql_insert_id();/*/   The data in $arr is escaped for the mysql query,/   but we need the unescaped variables, so we apply,/   stripslashes to all the elements in the array:/*/$arr = array_map('stripslashes',$arr);$insertedComment = new Comment($arr);/* Outputting the markup of the just-inserted comment: */echo json_encode(array('status'=>1,'html'=>$insertedComment->markup()));}else{/* Outputtng the error messages */echo '{"status":0,"errors":'.json_encode($arr).'}';}?>comment.class.php

PHP 

<?phpclass Comment{private $data = array();public function __construct($row){/*/   The constructor*/$this->data = $row;}public function markup(){/*/   This method outputs the XHTML markup of the comment*/// Setting up an alias, so we don't have to write $this->data every time:$d = &$this->data;$link_open = '';$link_close = '';if($d['url']){// If the person has entered a URL when adding a comment,// define opening and closing hyperlink tags$link_open = '<a href="'.$d['url'].'">';$link_close =  '</a>';}// Converting the time to a UNIX timestamp:$d['dt'] = strtotime($d['dt']);// Needed for the default gravatar image:$url = 'http://'.dirname($_SERVER['SERVER_NAME'].$_SERVER["REQUEST_URI"]).'/img/default_avatar.gif';return '<div class="comment"><div class="avatar">'.$link_open.'<img src="" />'.$link_close.'</div><div class="name">'.$link_open.$d['name'].$link_close.'</div><div class="date" title="Added at '.date('H:i \o\n d M Y',$d['dt']).'">'.date('d M Y',$d['dt']).'</div><p>'.$d['body'].'</p></div>';}public static function validate(&$arr){/*/   This method is used to validate the data sent via AJAX.//   It return true/false depending on whether the data is valid, and populates/   the $arr array passed as a paremter (notice the ampersand above) with/   either the valid input data, or the error messages.*/$errors = array();$data   = array();// Using the filter_input function introduced in PHP 5.2.0if(!($data['email'] = filter_input(INPUT_POST,'email',FILTER_VALIDATE_EMAIL))){$errors['email'] = 'Please enter a valid Email.';}if(!($data['url'] = filter_input(INPUT_POST,'url',FILTER_VALIDATE_URL))){// If the URL field was not populated with a valid URL,// act as if no URL was entered at all:$url = '';}// Using the filter with a custom callback function:if(!($data['body'] = filter_input(INPUT_POST,'body',FILTER_CALLBACK,array('options'=>'Comment::validate_text')))){$errors['body'] = 'Please enter a comment body.';}if(!($data['name'] = filter_input(INPUT_POST,'name',FILTER_CALLBACK,array('options'=>'Comment::validate_text')))){$errors['name'] = 'Please enter a name.';}if(!empty($errors)){// If there are errors, copy the $errors array to $arr:$arr = $errors;return false;}// If the data is valid, sanitize all the data and copy it to $arr:foreach($data as $k=>$v){$arr[$k] = mysql_real_escape_string($v);}// Ensure that the email is lower case:$arr['email'] = strtolower(trim($arr['email']));return true;}private static function validate_text($str){/*/   This method is used internally as a FILTER_CALLBACK*/if(mb_strlen($str,'utf8')<1)return false;// Encode all html special characters (<, >, ", & .. etc) and convert// the new line characters to <br> tags:$str = nl2br(htmlspecialchars($str));// Remove the new line characters that are left$str = str_replace(array(chr(10),chr(13)),'',$str);return $str;}}?>

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