滚动载入server端内容——样例
网页代码例如以下
<!doctype html>
<html>
<head>
<meta charset="utf-8">
<title>滚动载入</title>
<style>
* {margin:0; padding:0; border:0;}
#container {width:960px; margin:auto;}
#container:after {display:block; height:0; content:''; clear:both;}
.item {width:300px; height:200px; float:left; margin:10px; background-color:yellow;}
</style>
</head>
<body>
<div id="container">
<div class="item">1</div>
<div class="item">2</div>
<div class="item">3</div>
<div class="item">4</div>
<div class="item">5</div>
<div class="item">6</div>
<div class="item">7</div>
<div class="item">8</div>
<div class="item">9</div>
<div class="item">10</div>
<div class="item">11</div>
<div class="item">12</div>
</div>
<script>
var time = new Date() * 1; // 获取当前时间数值
window.onscroll = function(){
h_window = window.innerHeight || document.documentElement.clientHeight || document.body.clientHeight; // 获取视口高度
h_document = document.documentElement.scrollHeight || document.body.scrollHeight; // 获取网页高度
h_scroll = document.documentElement.scrollTop || document.body.scrollTop; // 获取页面的滚动高度
var times = 0; // 成功请求的次数
var xhr = new XMLHttpRequest();
xhr.onreadystatechange = function(){
if(xhr.readyState == 4){
if((xhr.status >= 200 && xhr.status < 300) || xhr.status == 304){
// 在container最后一个子元素后面插入返回的HTML代码
document.getElementById('container').insertAdjacentHTML('beforeEnd', xhr.responseText);
times++;
}
}
};
xhr.open('get', 'scrolltoload.php', true);
// 当 此次滚动于上次滚动间隔大于100毫秒 且 页面滚动高度+视口高度 > 网页高度 - 一个固定数值 时，载入新内容
if((new Date() * 1 - time > 100) && (h_window + h_scroll > h_document - 50)){
time = new Date() * 1;
xhr.send(null);
}
};
</script>
</body>
</html>
<div class="item">Ajax1</div> <div class="item">Ajax2</div> <div class="item">Ajax3</div> <div class="item">Ajax4</div> <div class="item">Ajax5</div> <div class="item">Ajax6</div>
