<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1">
<title>上拉加载</title>
<style type="text/css">
html,body,header,div,main,p,span,ul,li{
margin: 0; padding: 0;
}
#refreshContainer li{
background-color: #eee;
margin-bottom: 1px;
padding: 20px 10px;
text-align: center;
color: #550000;
}
.loadText{
line-height: 50px;
text-align: center;
}
.refreshText{
line-height: 50px;
text-align: center;
}
.hd{
width:100%;
height: 200px;
background-color: #aaaaff;
position: relative;
text-align: center;
color: #fff;
line-height: 200px;
z-index: 999;
}
.hd1{
width:100%;
height: 100px;
background-color: #f7bed7;
text-align: center;
color: #fff;
line-height: 100px;
}
</style>
</head>
<body>
<main>
<div class="hd1">HEADER</div>
<div class="hd">FIXED TAB</div>
<p class="refreshText"></p>
<ul id="refreshContainer">
<li>111</li>
<li>222</li>
<li>333</li>
<li>444</li>
<li>555</li>
<li>111</li>
<li>222</li>
<li>333</li>
<li>444</li>
<li>555</li>
<li>111</li>
<li>222</li>
<li>333</li>
<li>444</li>
<li>555</li>
</ul>
<p class="loadText"></p>
</main>
<script type="text/javascript">
(function(window) {
// 获取当前滚动条的位置
function getScrollTop() {
var scrollTop = 0;
if (document.documentElement && document.documentElement.scrollTop) {
scrollTop = document.documentElement.scrollTop;
} else if (document.body) {
scrollTop = document.body.scrollTop;
}
let d=document.getElementsByClassName("hd")[0],a=document.getElementById("refreshContainer"),
c=document.getElementsByClassName('hd1')[0];
if (scrollTop >= c.offsetHeight) {
d.style.position="fixed";
d.style.top="0";
a.style.paddingTop="210px"
}else{
d.style.position="relative";
a.style.paddingTop="0"
}
return scrollTop;
}
// 获取当前可视范围的高度
function getClientHeight() {
var clientHeight = 0;
if (document.body.clientHeight && document.documentElement.clientHeight) {
clientHeight = Math.min(document.body.clientHeight, document.documentElement.clientHeight);
}
else {
clientHeight = Math.max(document.body.clientHeight, document.documentElement.clientHeight);
}
return clientHeight;
}
// 获取文档完整的高度
function getScrollHeight() {
return Math.max(document.body.scrollHeight, document.documentElement.scrollHeight);
}
var _text = document.querySelector('.loadText'),
_container = document.getElementById('refreshContainer');
// 节流函数
var throttle = function(method, context){
clearTimeout(method.tId);
method.tId = setTimeout(function(){
method.call(context);
}, 300);
}
function fetchData() {
setTimeout(function() {
for(let i=0;i<10;i++){
_container.insertAdjacentHTML('beforeend', '<li>新增'+i+i+i+'</li>');
}
}, 1000);
}
window.onscroll = function() {
if (getScrollTop() + getClientHeight() == getScrollHeight()) {
_text.innerText = '加载中...';
throttle(fetchData);
}
};
// 下拉刷新
var element = document.getElementById('refreshContainer'),
refreshText = document.querySelector('.refreshText'),
startPos = 0,
transitionHeight = 0;
element.addEventListener('touchstart', function(e) {
console.log('初始位置：', e.touches[0].pageY);
startPos = e.touches[0].pageY;
// element.style.position = 'relative';
element.style.transition = 'transform 0s';
}, false);
element.addEventListener('touchmove', function(e) {
console.log('当前位置：', e.touches[0].pageY);
transitionHeight = e.touches[0].pageY - startPos;
if (transitionHeight > 0 && transitionHeight < 60) {
refreshText.innerText = '下拉刷新';
element.style.transform = 'translateY('+transitionHeight+'px)';
if (transitionHeight > 55) {
refreshText.innerText = '释放更新';
}
}
}, false);
element.addEventListener('touchend', function(e) {
element.style.transition = 'transform 0.5s ease 1s';
element.style.transform = 'translateY(0px)';
refreshText.innerText = '更新中...';
setTimeout(()=>{
refreshText.innerText = '';
},300)
}, false);
})(window);
</script>
</body>
</html>
