php实现Ajax分页程序

1.用ajax post数据到后台页面后，接着要重新连接数据库，别以为用之前的session连接过就可以了

2.为了处理返回乱码的问题，我添加了header("Content-Type:text/html;charset=GB2312");就可以正常显示了，后来在firefox下检验，却提示我下载这个网页，上网搜了不少资料，得到一个模糊的认识就是网页代码有语法错误，firefox为了安全起见不会直接显示而是提示下载，我重新检查了刚才那条语句，发现自己多写了个“\”,把它去掉后问题就解决了，哈哈，所以遇到这样的问题，好好检查一下html tag吧，毕竟firefox可不像ie那样smart

3.最后说一句，做web site的开发者，要负责任，别以为在ie下测试通过就万事大吉，毕竟不是所有人都用ie，还得要在别的浏览器下多做测试，这样才显示出你的专业水准

ajax脚本：

<script>

function viewpage(p){

if(window.XMLHttpRequest){

var xmlReq = new XMLHttpRequest();

} else if(window.ActiveXObject) {

var xmlReq = new ActiveXObject('Microsoft.XMLHTTP');

}

var formData = "page="+p;

xmlReq.onreadystatechange = function(){

if(xmlReq.readyState == 4){

document.getElementById('content2').innerHTML = xmlReq.responseText;

}

}

xmlReq.open("post", "hotel_list.php", true);

xmlReq.setRequestHeader("Content-Type", "application/x-www-form-urlencoded");

xmlReq.send(formData);

return false;

}

</script>

php代码：

header("Content-Type:text/html;charset=GB2312");

$pagesize=10;

//echo $_POST['page'];

$result = mysql_query("Select count(DISTINCT hotelname) FROM ".TBL_HOTELS);

$myrow = mysql_fetch_array($result);

$numrows=$myrow[0];

$pages=intval($numrows/$pagesize);

if ($numrows%$pagesize)

$pages++;

if (isset($_POST['page'])){

$page=intval($_POST['page']);

}

else{

//设置为第一页

$page=1;

}

$first=1;

$prev=$page-1;

$next=$page+1;

$last=$pages;

//计算记录偏移量

$offset=$pagesize*($page - 1);

//读取指定记录数

$result=mysql_query("select `hotelname` , count( * ) from ".TBL_HOTELS." GROUP BY `hotelname` order by id desc limit $offset,$pagesize");

$num = mysql_num_rows($result);

while ($row = mysql_fetch_array($result,MYSQL_NUM)) {

$hotelname[] = $row[0];

$countpeople[] = $row[1];

}

for($a=0;$a<$num;$a++)

{

//$result=mysql_query("select count(title) from " . TBL_Comments ." where `title`=\"".$title[$a]."\"");

//$row = mysql_fetch_row($result);

echo "<TABLE style=\"MARGIN-BOTTOM: 20px\" cellSpacing=0 cellPadding=0 width=100% border=0>\n";

echo "<TBODY>\n";

echo "<TR>\n";

echo "<TD style=\"PADDING-TOP: 5px\" vAlign=top align=left width=80>\n";

//rating_bar($title[$a],5);

echo "</TD>\n";

echo "<TD style=\"PADDING-TOP: 5px\" align=left width=100%><A title=$hotelname[$a] style=\"FONT-SIZE: 14px\" href=#>$hotelname[$a]</A>\n";

echo "</TD></TR>\n";

echo " <TR>\n";

echo "<TD></TD>\n";

echo "<TD style=\"PADDING-LEFT: 0px\">\n";

echo "<IMG src=\"images/comment.gif\" border=0> 推荐人数:($countpeople[$a]) |\n";

echo "<SPAN>平均分：<STRONG></STRONG> (".$count."票) | 评论数:()</SPAN>\n";

echo "</TD></TR></TBODY></TABLE>\n";

}

echo "<TABLE style=\"MARGIN-TOP: 30px\" cellSpacing=0 cellPadding=0 width=\"100%\"";

echo "border=0>";

echo "<TBODY><TR><TD colSpan=3 height=20>";

echo "<DIV align=center>";

echo "<P align=left><FONT color=red>第".$page."页/总".$pages."页 | 总".$numrows."条</FONT> | ";

if ($page>1) echo "<a onclick=\"viewpage(".$first.")\" href='#'>首页</a> | ";

if ($page>1) echo "<a onclick=\"viewpage(".$prev.")\" href='#'>上页</a> | ";

if ($page<$pages) echo "<a onclick=\"viewpage(".$next.")\" href='#'>下页</a> | ";

if ($page<$pages) echo "<a onclick=\"viewpage(".$last.")\" href='#'>尾页</a>";

echo "转到第 <INPUT maxLength=3 size=3 value=1 name=goto_page> 页 <INPUT hideFocus onclick=\"viewpage(document.all.goto_page.value)\" type=button value=Go name=cmd_goto>";

echo "</P></DIV></TD></TR></TBODY></TABLE>";