下面只是一个测试,在实际应用中,可能这种方法会比较占系统资源,不建意利用这样的方法处理分页效果。
var http_request=false;
function send_request(url){//初始化,指定处理函数,发送请求的函数
http_request=false;
//开始初始化xmlhttprequest对象
if(window.xmlhttprequest){//mozilla浏览器
http_request=new xmlhttprequest();
if(http_request.overridemimetype){//设置mime类别
http_request.overridemimetype("text/xml");
}
}
else if(window.activexobject){//ie浏览器
try{
http_request=new activexobject("msxml2.xmlhttp");
}catch(e){
try{
http_request=new activexobject("microsoft.xmlhttp");
}catch(e){}
}
}
if(!http_request){//异常,创建对象实例失败
window.alert("创建xmlhttp对象失败!");
return false;
}
http_request.onreadystatechange=processrequest;
//确定发送请求方式,url,及是否同步执行下段代码
http_request.open("get",url,true);
http_request.send(null);
}
//处理返回信息的函数
function processrequest(){
if(http_request.readystate==4){//判断对象状态
if(http_request.status==200){//信息已成功返回,开始处理信息
document.getelementbyid('result').innerhtml=http_request.responsetext;
}
else{//页面不正常
alert("您所请求的页面不正常!");
}
}
}
function dopage(obj,url){
document.getelementbyid(obj).innerhtml="正在读取数据...";
send_request(url);
reobj=obj;
}
php教程 html处理代码
$classid=$_request['classid'];
//注意有个问题,就是数据如果总数小于每页数据不能显示$page=isset($_get['page'])?intval($_get['page']):1; //这句就是获取page=18中的page的值,假如不存在page,那么页数就是1。
$num=10; //每页显示10条数据require "conn.php";
mysql教程_select_db($database_lr, $lr);
/*
首先咱们要获取数据库教程中到底有多少数据,才能判断具体要分多少页,具体的公式就是
总数据库除以每页显示的条数,有余进一。
也就是说10/3=3.3333=4 有余数就要进一。
*/$result=mysql_query("select * from blog where classid='$classid'");
$total=mysql_num_rows($result); //查询所有的数据$url='show_main.php';//获取本页url
//页码计算
$pagenum=ceil($total/$num); //获得总页数,也是最后一页
$page=min($pagenum,$page);//获得首页
$prepg=$page-1;//上一页
$nextpg=($page==$pagenum ? 0 : $page+1);//下一页
$offset=($page-1)*$num; //获取limit的第一个参数的值,假如第一页则为(1-1)*10=0,第二页为(2-1)*10=10。//开始分页导航条代码:
$pagenav=$page."/".$pagenum." ".($total?($offset+1):0)."-".min($offset+10,$total)." total $total ";//第一页:
if($page==1) {
$pagenav.="first ";
}
else
{$pagenav.="first ";}
if($prepg) $pagenav.=" prev "; else $pagenav.=" prev ";
if($nextpg) $pagenav.=" next "; else $pagenav.=" next ";
if ($pagenum>$page){
$pagenav.=" last ";
}
else{
$pagenav.=" last";
}
$pagenav.=" total page $pagenum ";//假如传入的页数参数大于总页数,则显示错误信息
if($page>$pagenum){
echo "error : can not found the page ".$page;
exit;
}$info=mysql_query("select * from blog where classid='$classid' order by id desc limit $offset,$num"); //获取相应页数所需要显示的数据
if ($total>0)
{
while($it=mysql_fetch_array($info)){
echo $it['title']." (".$it['updatetime'].")";
echo "
";
echo $it['content'];
echo "
";
} //显示数据
echo"
";
echo $pagenav;//输出分页导航
}
else
{
echo"no comment.";
}
?>

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