H5在微信公众号的下拉刷新实现
程序员文章站
2022-03-04 09:33:29
由于项目需要在微信公众号做“健康资讯”相关的，所以会用到下拉刷新，可是使用的原生H5做页面，不过希望能够做到和app原生一样的下拉刷新效果，然后在网上找了找...
由于项目需要在微信公众号做“健康资讯”相关的，所以会用到下拉刷新，可是使用的原生H5做页面，不过希望能够做到和app原生一样的下拉刷新效果，然后在网上找了找H5下拉刷新相关的资料，具体有：Iscroll，MUI,Hook.js,dragloader 等，它们宣称都可以很好的解决下拉刷新的问题，但是我查看的具体的官网文档和例子后，我还是选择了Iscroll作为本次的下拉刷新实现，因为其它的技术要么文档写的不好，要么例子实现太少，而iscroll的例子却很多。
下面是我从项目里面把下拉刷新的模块扒出来的，把实现的效果分享一下
具体实现代码思路是：页面的列表展示通过后台返回的json数组，然后遍历json数组通过js添加列表。每次向下刷新后类似点击分页“下一页”，具体代码如下：
<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0, user-scalable=0, minimum-scale=1.0, maximum-scale=1.0">
<meta name="apple-mobile-web-app-capable" content="yes">
<meta name="apple-mobile-web-app-status-bar-style" content="black">
<title>健康资讯</title>
<script src="jquery.min.js"/></script>
<script type="text/javascript" src="iscroll.js"></script>
<link rel="stylesheet" type="text/css" href="bookBase.css" />
<!--start-->
<style>
html, body{ background-color: #fff;}
.m-img-font-box{}
.m-img-font-box a.link{ display: block; border-bottom: 1px solid #ccc;}
.m-img-font-box a.link dl{ padding: 5px 10px; height: 50px; overflow: hidden;}
.m-img-font-box a.link dl dt{ width: 60px; height: 60px; float: left;}
.m-img-font-box a.link dl dt img{ width: 100%; height: 82%;}
.m-img-font-box a.link dl dd{ margin-left: 65px; padding-top: 1px;}
.m-img-font-box a.link dl dd p{ font-size: 16px; color: #bbb;}
.m-img-font-box a.link dl dd p.title{ font-size: 16px; color: #464646; width: 91%; overflow: hidden; text-overflow:ellipsis; white-space:nowrap;}
.m-img-font-box a.link dl dd p.font{ width: 98%; overflow: hidden; text-overflow:ellipsis; white-space:nowrap; font-size: 14px;}
h3{ font-size: 13px; font-weight: normal; padding: 5px 10px;}
#wrapper {
position:absolute; z-index:1;
top:30px; bottom:0; left:-9999px;
width:100%;
background:#FFF;
overflow:auto;
}
#scroller {
position:absolute; z-index:1;
-webkit-tap-highlight-color:rgba(0,0,0,0);
width:100%;
padding:0;
}
#pullUp {
background:#fff;
height:40px;
line-height:40px;
padding:5px 10px;
border-bottom:1px solid #ccc;
font-weight:bold;
font-size:14px;
color:#888;
}
#pullUp.loading .pullUpLabel {
background:url(../images/loading/loading.gif) no-repeat center 0;
width: 100%;
height: 30px;
align:center;
background-size: auto 100%;
}
</style>
<script type="text/javascript">
var myScroll,
pullUpEl, pullUpOffset,
generatedCount = 0;
var currenPage = 0; var pageSize = 3;
function pullUpAction () {
currenPage ++;
var elInit = $("#thelist");
var param = {"currentPage":currenPage,"pageSize":pageSize};
$.ajax({
url:"result.json", //后台处理程序
type:'post', //数据发送方式
dataType: 'json',
data:param,
async: true,
success:function(data){
var result = "" ;
$(data).each(function(){
var checker = $(this)[0];
result += "<p class='mfb'><a class='link' href='"+checker.url+"'>"+
"<dl><dt><img src='"+checker.icon+"'/> </dt>"+
"<dd><p class='title'>"+checker.title+"</p>"+
"<p class='title'>"+checker.subTitle+"</p>"+
"</dd></dl></a></p>";
});
elInit.append(result);
myScroll.refresh();
}
});
}
function loaded() {
pullUpEl = document.getElementById('pullUp');
if(pullUpEl != null){
pullUpOffset = pullUpEl.offsetHeight;
}else{
pullUpOffset = 0;
}
myScroll = new iScroll('wrapper', {
useTransition: true,
onRefresh: function () {
if (pullUpEl.className.match('loading')) {
pullUpEl.className = '';
$(pullUpEl).css("display", "none");
pullUpEl.querySelector('.pullUpLabel').innerHTML = 'Pull up to load more...';
}
},
onScrollMove: function () {
if (this.y < (this.maxScrollY - 5) && !pullUpEl.className.match('flip')) {
pullUpEl.className = 'flip';
$(pullUpEl).css("display","");
pullUpEl.querySelector('.pullUpLabel').innerHTML = '松开载入更多..';
this.maxScrollY = this.maxScrollY;
} else if (this.y > (this.maxScrollY + 5) && pullUpEl.className.match('flip')) {
pullUpEl.className = '';
pullUpEl.querySelector('.pullUpLabel').innerHTML = 'Pull up to load more...';
this.maxScrollY = pullUpOffset;
}
},
onScrollEnd: function () {
if (pullUpEl.className.match('flip')) {
pullUpEl.className = 'loading';
$(pullUpEl).css("display","");
pullUpEl.querySelector('.pullUpLabel').innerHTML = '';
pullUpAction(); // Execute custom function (ajax call?)
}
}
});
document.getElementById('wrapper').style.left = '0';
}
document.addEventListener('touchmove', function (e) { e.preventDefault(); }, false);
document.addEventListener('DOMContentLoaded', function () { setTimeout(loaded, 200); }, false);
//页面加载完成后，向后台请求数据
$(function(){
pullUpAction();
});
</script>
</style>
</head>
<body>
<h3>资讯列表</h3>
<p class="cm-container-box" id="wrapper">
<p class="cm-table" id="scroller">
<p class="m-img-font-box" id="thelist">
</p>
<p id="pullUp" style="display:none; text-align: center;">
<span class="pullUpLabel"></span>
</p>
</p>
</p>
</body>
</html>
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