H5移动端网页上拉及下拉刷新数据
上拉刷新demo
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1">
<title>Document</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; }
.refreshText{ position: absolute; width: 100%; line-height: 50px; text-align: center; left: 0; top: 0; }
</style>
</head>
<body>
<main>
<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>
</main>
<script type="text/javascript">
(function(window) {
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';
_element.append("<li>100</li>");
}
}
}, false);
_element.addEventListener('touchend', function(e) {
_element.style.transition = 'transform 0.5s ease 1s';
_element.style.transform = 'translateY(0px)';
_refreshText.innerText = '更新中...';
// todo...
}, false);
})(window);
</script>
</body>
</html>下拉加载更多demo
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1">
<title>Document</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; }
.refreshText{ line-height: 50px; text-align: center; }
</style>
</head>
<body>
<main>
<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="refreshText"></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;
}
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('.refreshText'),
_container = document.getElementById('refreshContainer');
var throttle = function(method, context){
clearTimeout(method.tId);
method.tId = setTimeout(function(){
method.call(context);
}, 300);
}
function fetchData() {
setTimeout(function() {
_container.insertAdjacentHTML('beforeend', '<li>new add...</li>');
}, 1000);
}
window.onscroll = function() {
if (getScrollTop() + getClientHeight() == getScrollHeight()) {
_text.innerText = '加载中...';
throttle(fetchData);
}
};
})(window);
</script>
</body>
</html>
由于上面的demo针对是单页面且针对整个页面区，所以很多时候不大适合，下面这个例子是针对 div区域做的下拉刷新
滚动区域为div 的下拉刷新 demo
注：该demo相关的几个文件未给出，但关键代码已贴
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, user-scalable=no, initial-scale=1.0, maximum-scale=1.0, minimum-scale=1.0">
<title>下拉刷新-移动端</title>
<script src="jscript/jquery-1.11.0.min.js" type="text/javascript"></script>
<script src="jscript/util.js" type="text/javascript"></script>
<script src="jscript/publish.js" type="text/javascript"></script>
<link rel="stylesheet" href="css/mbase.css">
<link rel="shortcut icon" href="favicon.ico" type="image/x-icon">
<style>
.refreshText {
line-height: 50px;
text-align: center;
}
</style>
</head>
<body>
<div class="header">
<div style="width:10%;float:left; text-align:center; vertical-align:central;"><img src="mimages/nconlogo.png" style="width:75px;height:75px;"></div>
<div style="width:75%;float:right; margin-left:10px;">
<div class="nav">
<a href="#" οnclick="sel(this,2);">平面口罩</a>
</div>
</div>
</div>
<div class="content" id="div2">
<p style="text-align:center;font-size:18px;margin-bottom:5px;margin-top:5px;">平面口罩</p>
<div id="wraper1" style="overflow-y:auto; height:75vh;">
<div style="margin-left:5px; " id="infoData2">
暂无信息
</div>
<p class="refreshText" id="refreshText1"></p>
</div>
</div>
<div class="footer">
<p>下拉刷新测试</p>
</div>
<script type="text/javascript">
var content = document.getElementById('wraper1'); //滑动容器
var _text = document.getElementById('refreshText1');
(function (window) {
$("#btnOk").click(function () {
publish();
});
// 获取当前滚动条的位置
function getScrollTop() {
var scrollTop = 0;
if (document.documentElement && content.scrollTop) {
scrollTop = content.scrollTop;
} else if (document.body) {
scrollTop = document.body.scrollTop;
}
return scrollTop;
}
// 获取当前可视范围的高度
function getClientHeight() {
var clientHeight = 0;
if (document.body.clientHeight && content.clientHeight) {
clientHeight = Math.min(document.body.clientHeight, content.clientHeight);
}
else {
clientHeight = Math.max(document.body.clientHeight, content.clientHeight);
}
return clientHeight;
}
// 获取文档完整的高度
function getScrollHeight() {
return Math.max(document.body.scrollHeight, content.scrollHeight);
}
var throttle = function (method, context) {
clearTimeout(method.tId);
method.tId = setTimeout(function () {
method.call(context);
}, 500);
}
function fetchData() {
setTimeout(function () {
//_container.insertAdjacentHTML('beforeend', '<li>new add...</li>');
pageIndex++;
getconinfoData(pageIndex, SmallpageSize);
//alert("loading " + pageIndex+" 页 typeid="+CurrentTypeId);
}, 1000);
}
////////////
// 触摸开始
function boxTouchStart(e) {
var touch = e.touches[0];
startY = touch.pageY;
}
// 触摸移动
function boxTouchMove(e) {
var touch = e.touches[0];
moveY = touch.pageY - startY;
index = Number(e.target.id.split('page')[1])
var htop = getScrollTop();
var hch = getClientHeight();
var sch = getScrollHeight();
if (htop + hch >= sch) {
_text.innerText = '加载中...';
throttle(fetchData);
}
}
content.addEventListener('touchstart', boxTouchStart, false)
content.addEventListener('touchmove', boxTouchMove, false)
})(window);
</script>
<script>
function sel(fromobj, val) {
//alert(val);
CurrentTypeId = 2;
$(".nav a").removeClass("active");
$(fromobj).addClass("active");
getconinfoData(pageIndex, SmallpageSize);
}
</script>
</body>
</html>
getconinfoData为加载数据的js
function getconinfoData(idx, size) {
var val = CurrentTypeId;
var typeId = parseInt(val) * 100;
if (idx == 1) {
//先清空
$($("#infoData" + val)).html("");
}
var data = {};
data.call = ReqDefaultInfo;
var url = ReqDefaultDomain + "cov/list?typeId=" + typeId + "&pageIndex=" + idx + "&pageSize=" + size
ajaxProcessForApi(url, data.call, function callSuccess(oRet) {
var result = oRet.Data;
var html = "";
var tr = "<div class='listdata'><ul><li>产品名称：{PName}</li><li>注册证号：{RegisterNo}</li><li class='publisher'>注册人：{RegisterName}</li></ul></div>";
$(result.Rows).each(function () {
html += tr.format(this);
});
if (html.length < 10) {
html = "暂无信息";
$($("#refreshText" + val)).innerText = "已经到底了...";
}
$($("#infoData" + val)).append(html);
}, function callError(e) {
//alert(e);
});
}
页面绑定事件时加入了节流函数，其作用就是忽略滚动条300毫秒内的连续多次触发。
小结
上拉刷新的实现主要依靠的是touch事件的三个阶段，以及借助CSS3动画效果；下拉加载主要依靠页面的boxTouchMove事件，需要注意的是页面滚动时可能要考虑函数节流。
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