浏览器窗口滚动加载数据采用异步形式从后台加载数据
程序员文章站
2024-02-28 08:59:16
以下滚动效果为在网上查找。 在滚动条距顶部距离(页面超出窗口的高度)时采用异步形式从后台加载数据 复制代码 代码如下: <%@ page language="c#"...
以下滚动效果为在网上查找。
在滚动条距顶部距离(页面超出窗口的高度)时采用异步形式从后台加载数据
<%@ page language="c#" autoeventwireup="true" codebehind="scrollloaddata.aspx.cs" inherits="webapplication1.scrollloaddata" %>
<!doctype html public "-//w3c//dtd xhtml 1.0 transitional//en" "http://www.w3.org/tr/xhtml1/dtd/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<title>滚动加载数据库数据</title>
<script src="../scripts/jquery-1.4.1-vsdoc.js" type="text/javascript"></script>
<script src="../scripts/jquery-1.4.1.js" type="text/javascript"></script>
<script src="../scripts/jquery-1.4.1.min.js" type="text/javascript"></script>
<script type="text/javascript">
$(document).ready(function () {
var range = 50; //距下边界长度/单位px
var elemt = 500; //插入元素高度/单位px
var maxnum = 20; //设置加载最多次数
var num = 1;
var totalheight = 0;
var main = $("#content"); //主体元素
$(window).scroll(function(){
var srollpos = $(window).scrolltop(); //滚动条距顶部距离(页面超出窗口的高度)
totalheight = parsefloat($(window).height()) + parsefloat(srollpos);
if (($(document).height() - range) <= totalheight && num != maxnum) {
$.ajax({
url: "../demo/handlerdemo.ashx",//显示数据的方法页
type: "get",
data: "name=json",
datatype: "json",
//cache: false,
success: function (data) {
data = eval(data);
var varhtml = "";
varhtml = "<ul>"
$(data).each(function (i) {
varhtml += "<li>" + data[i].id + ":" + data[i].event + "</li>"; //id 和event为数据库映射的字段
});
varhtml += "</ul>";
main.append("<div style='border:0px solid tomato;margin-top:20px;color:#ac" + (num % 20) + (num % 20) + ";height:" + elemt + "' >hello world" + srollpos + "<br />"+varhtml + "---" + num + "</div>");
},
error: function () {
alert("error");
}
});
num++;
}
});
});
</script>
<style type="text/css">
li
{
list-style-type:none;
float:left;
padding-left:20px;
}
</style>
</head>
<body>
<form id="form1" runat="server">
<div id="content" style="height:960px">
<div id="follow">this is a scroll test;<br/> 页面下拉自动加载内容</div>
<div style='border:1px solid tomato;margin-top:20px;color:#ac1;height:800' >hello world test div</div>
</div>
</form>
</body>
</html>
在滚动条距顶部距离(页面超出窗口的高度)时采用异步形式从后台加载数据
复制代码 代码如下:
<%@ page language="c#" autoeventwireup="true" codebehind="scrollloaddata.aspx.cs" inherits="webapplication1.scrollloaddata" %>
<!doctype html public "-//w3c//dtd xhtml 1.0 transitional//en" "http://www.w3.org/tr/xhtml1/dtd/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<title>滚动加载数据库数据</title>
<script src="../scripts/jquery-1.4.1-vsdoc.js" type="text/javascript"></script>
<script src="../scripts/jquery-1.4.1.js" type="text/javascript"></script>
<script src="../scripts/jquery-1.4.1.min.js" type="text/javascript"></script>
<script type="text/javascript">
$(document).ready(function () {
var range = 50; //距下边界长度/单位px
var elemt = 500; //插入元素高度/单位px
var maxnum = 20; //设置加载最多次数
var num = 1;
var totalheight = 0;
var main = $("#content"); //主体元素
$(window).scroll(function(){
var srollpos = $(window).scrolltop(); //滚动条距顶部距离(页面超出窗口的高度)
totalheight = parsefloat($(window).height()) + parsefloat(srollpos);
if (($(document).height() - range) <= totalheight && num != maxnum) {
$.ajax({
url: "../demo/handlerdemo.ashx",//显示数据的方法页
type: "get",
data: "name=json",
datatype: "json",
//cache: false,
success: function (data) {
data = eval(data);
var varhtml = "";
varhtml = "<ul>"
$(data).each(function (i) {
varhtml += "<li>" + data[i].id + ":" + data[i].event + "</li>"; //id 和event为数据库映射的字段
});
varhtml += "</ul>";
main.append("<div style='border:0px solid tomato;margin-top:20px;color:#ac" + (num % 20) + (num % 20) + ";height:" + elemt + "' >hello world" + srollpos + "<br />"+varhtml + "---" + num + "</div>");
},
error: function () {
alert("error");
}
});
num++;
}
});
});
</script>
<style type="text/css">
li
{
list-style-type:none;
float:left;
padding-left:20px;
}
</style>
</head>
<body>
<form id="form1" runat="server">
<div id="content" style="height:960px">
<div id="follow">this is a scroll test;<br/> 页面下拉自动加载内容</div>
<div style='border:1px solid tomato;margin-top:20px;color:#ac1;height:800' >hello world test div</div>
</div>
</form>
</body>
</html>