一个简单的ajax|jquery实现的留言板（未做安全验证）

声明：目前程序0.0版本仅为实验，并没有对用户输入进行处理，在1.0计划加入以下功能：

1.正则匹配验证email,url

2.特殊字符转义，过滤

3.加入验证码功能

程序清单：

1.index.php 代码核心部分是标签中的ajax。参见http://api.jquery.com/jQuery.ajax/

通过向post.php传值，然后用$('#messages').load("messages.php")以ajax的方式更新id = messages 的div

	

		

			
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2.post.php

A fatal MySQL error occured.\n
Query: " . $query . "
\nError: (" . mysql_errno() . ") " . mysql_error());
exit;

?>

 3.messages.php

Messages loaded: ".date("d/m/y : H:i:s", time())."
";

if(isset($_GET['offset'])){
	$offset = $_GET['offset'];
}else{
	$offset=0;
}

$numresults=mysql_query("SELECT * FROM message_board");

$numrows=mysql_num_rows($numresults)
or die ("Currently you do not have any items.");

$query="SELECT * FROM message_board ORDER BY id desc limit $offset,$limit";//pagination
$result=mysql_query($query);
$num=mysql_num_rows($result);
mysql_close();

//echo "
Showing 10 of $num comments
";

$i=0;
if ($num > 0){
	echo '
';
	while ($i < $num) {

		$id=mysql_result($result,$i,"id");
		$date=mysql_result($result,$i,"post_date");
		$email=mysql_result($result,$i,"email");
		$url=mysql_result($result,$i,"url");
		$name=stripslashes(mysql_result($result,$i,"name"));
		$message=stripslashes(mysql_result($result,$i,"message"));

		echo "
";
		//if ($email!=""):
		//echo "by $name
";
		//else:
		echo "$name says:
";
		//endif;
		echo "On $date
";
		if ($url!="") {
			echo "URL: $url
";
		}
		echo "
$message
";

		echo "
";

		$i++;
	}

echo '
';

	// create paging links below
	echo '
';
	if ($offset >= $limit) {
		$prevoffset = $offset - $limit;
		echo "Back \n";
	}

	$pages=intval($numrows/$limit);
	if ($pages < ($numrows/$limit)){
		$pages=($pages + 1);
	}

	

	//show next if not last
	if (! ( ($offset/$limit) == ($pages - 1) ) && ($pages != 1) ) {
		$newoffset = $offset+$limit;
		echo "Next\n";
	}

	echo '
';

}else{
	echo "No entry yet.";
}
?>