基于iscroll.js实现下拉刷新和上拉加载效果
2016-11-28 08:53
1401 查看
现在已经不是纯Android独霸天下的时代了，H5嵌入Android的Hybrid混合开发是大势所趋。今天给大家带来的就是移动端中常见的“上拉刷新，下拉加载”特效，这个特效将会基于H5来实现。
先看下运行效果：
是不是有点小小的‘鸡冻' ，它就是由我们今天要介绍的主人公‘iscroll.js'实现的，接下来我以最最简便的方式教给大家~~
实现步骤
一、准备好iscroll.js库
到官网下载即可：
https://github.com/cubiq/iscroll
二、搭建页面结构
<!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>iScroll 实例：下拉刷新，滚动翻页</title>
<style type="text/css" media="all">
body,ul,li {
padding:0;
margin:0;
border:0;
}
body {
font-size:12px;
-webkit-user-select:none;
-webkit-text-size-adjust:none;
font-family:helvetica;
}
#header {
position:absolute;
top:0; left:0;
width:100%;
height:45px;
line-height:45px;
background-image:-webkit-gradient(linear, 0 0, 0 100%, color-stop(0, #fe96c9), color-stop(0.05, #d51875), color-stop(1, #7b0a2e));
background-image:-moz-linear-gradient(top, #fe96c9, #d51875 5%, #7b0a2e);
background-image:-o-linear-gradient(top, #fe96c9, #d51875 5%, #7b0a2e);
padding:0;
color:#eee;
font-size:20px;
text-align:center;
}
#header a {
color:#f3f3f3;
text-decoration:none;
font-weight:bold;
text-shadow:0 -1px 0 rgba(0,0,0,0.5);
}
#footer {
position:absolute;
bottom:0; left:0;
width:100%;
height:48px;
background-image:-webkit-gradient(linear, 0 0, 0 100%, color-stop(0, #999), color-stop(0.02, #666), color-stop(1, #222));
background-image:-moz-linear-gradient(top, #999, #666 2%, #222);
background-image:-o-linear-gradient(top, #999, #666 2%, #222);
padding:0;
border-top:1px solid #444;
}
#wrapper {
position:absolute; z-index:1;
top:45px; bottom:48px; left:0;
width:100%;
background:#555;
overflow:auto;
}
#scroller {
position:relative;
/* -webkit-touch-callout:none;*/
-webkit-tap-highlight-color:rgba(0,0,0,0);
float:left;
width:100%;
padding:0;
}
#scroller ul {
position:relative;
list-style:none;
padding:0;
margin:0;
width:100%;
text-align:left;
}
#scroller li {
padding:0 10px;
height:40px;
line-height:40px;
border-bottom:1px solid #ccc;
border-top:1px solid #fff;
background-color:#fafafa;
font-size:14px;
}
#scroller li > a {
display:block;
}
/**
*
* 下拉样式 Pull down styles
*
*/
#pullDown, #pullUp {
background:#fff;
height:40px;
line-height:40px;
padding:5px 10px;
border-bottom:1px solid #ccc;
font-weight:bold;
font-size:14px;
color:#888;
}
#pullDown .pullDownIcon, #pullUp .pullUpIcon {
display:block; float:left;
width:40px; height:40px;
background:url(pull-icon@2x.png) 0 0 no-repeat;
-webkit-background-size:40px 80px; background-size:40px 80px;
-webkit-transition-property:-webkit-transform;
-webkit-transition-duration:250ms;
}
#pullDown .pullDownIcon {
-webkit-transform:rotate(0deg) translateZ(0);
}
#pullUp .pullUpIcon {
-webkit-transform:rotate(-180deg) translateZ(0);
}
</style>
</head>
<body>
<div id="header">
<a href="../db.html#page2">iScroll实例：下拉刷新，滚动翻页</a>
</div>
<div id="wrapper">
<div id="scroller">
<div id="pullDown">
<span class="pullDownIcon"></span><span class="pullDownLabel">下拉刷新...</span>
</div>
<ul id="thelist">
<li>我是三冰 1</li>
<li>我是三冰 2</li>
<li>我是三冰 3</li>
<li>我是三冰 4</li>
<li>我是三冰 5</li>
<li>我是三冰 6</li>
<li>我是三冰 7</li>
<li>我是三冰 8</li>
<li>我是三冰 9</li>
<li>我是三冰 10</li>
<li>我是三冰 11</li>
<li>我是三冰 12</li>
<li>我是三冰 13</li>
</ul>
<div id="pullUp">
<span class="pullUpIcon"></span><span class="pullUpLabel">上拉加载更多...</span>
</div>
</div>
</div>
<div id="footer"></div>
</body>
</html>
代码非常简单，无需多言，仅仅搭建一个静态结构而已~~
效果如下：
对照这个效果图看上面代码简直太easy，暂时与iscroll没有半毛钱关系，就是纯静态页面，此时你们唯一没有就是下面这个小图标，不用着急，文章最后会给到你的~~
二、完整Js代码
<script type="application/javascript" src="iscroll.js"></script>
<script type="text/javascript">
var myScroll,
pullDownEl, pullDownOffset,
pullUpEl, pullUpOffset,
generatedCount = 0;
/**
* 下拉刷新 （自定义实现此方法）
* myScroll.refresh(); // 数据加载完成后，调用界面更新方法
*/
function pullDownAction () {
setTimeout(function () { // <-- Simulate network congestion, remove setTimeout from production!
var el, li, i;
el = document.getElementById('thelist');
for (i=0; i<3; i++) {
li = document.createElement('li');
li.innerText = '添加三冰 ' + (++generatedCount);
el.insertBefore(li, el.childNodes[0]);
}
myScroll.refresh(); //数据加载完成后，调用界面更新方法 Remember to refresh when contents are loaded (ie: on ajax completion)
}, 1000); // <-- Simulate network congestion, remove setTimeout from production!
}
/**
* 滚动翻页 （自定义实现此方法）
* myScroll.refresh(); // 数据加载完成后，调用界面更新方法
*/
function pullUpAction () {
setTimeout(function () { // <-- Simulate network congestion, remove setTimeout from production!
var el, li, i;
el = document.getElementById('thelist');
for (i=0; i<3; i++) {
li = document.createElement('li');
li.innerText = '添加三冰 ' + (++generatedCount);
el.appendChild(li, el.childNodes[0]);
}
myScroll.refresh(); // 数据加载完成后，调用界面更新方法 Remember to refresh when contents are loaded (ie: on ajax completion)
}, 1000); // <-- Simulate network congestion, remove setTimeout from production!
}
/**
* 初始化iScroll控件
*/
function loaded() {
pullDownEl = document.getElementById('pullDown');
pullDownOffset = pullDownEl.offsetHeight;
pullUpEl = document.getElementById('pullUp');
pullUpOffset = pullUpEl.offsetHeight;
myScroll = new iScroll('wrapper', {
scrollbarClass: 'myScrollbar', /* 重要样式 */
useTransition: false, /* 此属性不知用意，本人从true改为false */
topOffset: pullDownOffset,
onRefresh: function () {
if (pullDownEl.className.match('loading')) {
pullDownEl.className = '';
pullDownEl.querySelector('.pullDownLabel').innerHTML = '下拉刷新...';
} else if (pullUpEl.className.match('loading')) {
pullUpEl.className = '';
pullUpEl.querySelector('.pullUpLabel').innerHTML = '上拉加载更多...';
}
},
onScrollMove: function () {
if (this.y > 5 && !pullDownEl.className.match('flip')) {
pullDownEl.className = 'flip';
pullDownEl.querySelector('.pullDownLabel').innerHTML = '松手开始更新...';
this.minScrollY = 0;
} else if (this.y < 5 && pullDownEl.className.match('flip')) {
pullDownEl.className = '';
pullDownEl.querySelector('.pullDownLabel').innerHTML = '下拉刷新...';
this.minScrollY = -pullDownOffset;
} else if (this.y < (this.maxScrollY - 5) && !pullUpEl.className.match('flip')) {
pullUpEl.className = 'flip';
pullUpEl.querySelector('.pullUpLabel').innerHTML = '松手开始更新...';
this.maxScrollY = this.maxScrollY;
} else if (this.y > (this.maxScrollY + 5) && pullUpEl.className.match('flip')) {
pullUpEl.className = '';
pullUpEl.querySelector('.pullUpLabel').innerHTML = '上拉加载更多...';
this.maxScrollY = pullUpOffset;
}
},
onScrollEnd: function () {
if (pullDownEl.className.match('flip')) {
pullDownEl.className = 'loading';
pullDownEl.querySelector('.pullDownLabel').innerHTML = '加载中...';
pullDownAction(); // Execute custom function (ajax call?)
} else if (pullUpEl.className.match('flip')) {
pullUpEl.className = 'loading';
pullUpEl.querySelector('.pullUpLabel').innerHTML = '加载中...';
pullUpAction(); // Execute custom function (ajax call?)
}
}
});
setTimeout(function () { document.getElementById('wrapper').style.left = '0'; }, 800);
}
//初始化绑定iScroll控件
document.addEventListener('touchmove', function (e) { e.preventDefault(); }, false);
document.addEventListener('DOMContentLoaded', loaded, false);
</script>
这么多代码看啊，不用着急，挑几个重点给你说说：
1）onRefresh函数是指页面刷新或调用refresh()函数会触发此函数，里面代码中主要做【一些重置样式和文字】的处理。
2）onScrollMove函数是指拖拽页面，不松手的时候会触发此函数，里面代码中主要做【箭头有个旋转效果和松手提示】的处理。
3）onScrollEnd函数是指松开手，停止拖拽的时候会触发的函数，里面代码中主要做【刷新数据和一些加载动画效果】的处理。
4）topOffset属性主要是可以隐藏一个高度，正好把下拉刷新给隐藏掉
5）函数pullDownAction和pullUpAction中，我是自己用createElement函数造数据，但是真实开发中，这里可以换成Ajax请求服务器数据即可
看看现在的效果如何：
现在数据什么的都能刷新了，只差那么一点点，如果下拉和上拉的时候，加载的小图标有个动画效果那就超级“完美”了：
既然是要来点动画效果，肯定是用最新的CSS3技术呀，废话不多说，直接贴完整代码了：
<!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>iScroll 实例：下拉刷新，滚动翻页</title>
<style type="text/css" media="all">
body,ul,li {
padding:0;
margin:0;
border:0;
}
body {
font-size:12px;
-webkit-user-select:none;
-webkit-text-size-adjust:none;
font-family:helvetica;
}
#header {
position:absolute;
top:0; left:0;
width:100%;
height:45px;
line-height:45px;
background-image:-webkit-gradient(linear, 0 0, 0 100%, color-stop(0, #fe96c9), color-stop(0.05, #d51875), color-stop(1, #7b0a2e));
background-image:-moz-linear-gradient(top, #fe96c9, #d51875 5%, #7b0a2e);
background-image:-o-linear-gradient(top, #fe96c9, #d51875 5%, #7b0a2e);
padding:0;
color:#eee;
font-size:20px;
text-align:center;
}
#header a {
color:#f3f3f3;
text-decoration:none;
font-weight:bold;
text-shadow:0 -1px 0 rgba(0,0,0,0.5);
}
#footer {
position:absolute;
bottom:0; left:0;
width:100%;
height:48px;
background-image:-webkit-gradient(linear, 0 0, 0 100%, color-stop(0, #999), color-stop(0.02, #666), color-stop(1, #222));
background-image:-moz-linear-gradient(top, #999, #666 2%, #222);
background-image:-o-linear-gradient(top, #999, #666 2%, #222);
padding:0;
border-top:1px solid #444;
}
#wrapper {
position:absolute; z-index:1;
top:45px; bottom:48px; left:0;
width:100%;
background:#555;
overflow:auto;
}
#scroller {
position:relative;
/* -webkit-touch-callout:none;*/
-webkit-tap-highlight-color:rgba(0,0,0,0);
float:left;
width:100%;
padding:0;
}
#scroller ul {
position:relative;
list-style:none;
padding:0;
margin:0;
width:100%;
text-align:left;
}
#scroller li {
padding:0 10px;
height:40px;
line-height:40px;
border-bottom:1px solid #ccc;
border-top:1px solid #fff;
background-color:#fafafa;
font-size:14px;
}
#scroller li > a {
display:block;
}
/**
*
* 下拉样式 Pull down styles
*
*/
#pullDown, #pullUp {
background:#fff;
height:40px;
line-height:40px;
padding:5px 10px;
border-bottom:1px solid #ccc;
font-weight:bold;
font-size:14px;
color:#888;
}
#pullDown .pullDownIcon, #pullUp .pullUpIcon {
display:block; float:left;
width:40px; height:40px;
background:url(pull-icon@2x.png) 0 0 no-repeat;
-webkit-background-size:40px 80px; background-size:40px 80px;
-webkit-transition-property:-webkit-transform;
-webkit-transition-duration:250ms;
}
#pullDown .pullDownIcon {
-webkit-transform:rotate(0deg) translateZ(0);
}
#pullUp .pullUpIcon {
-webkit-transform:rotate(-180deg) translateZ(0);
}
/**
* 动画效果css3代码
*/
#pullDown.flip .pullDownIcon {
-webkit-transform:rotate(-180deg) translateZ(0);
}
#pullUp.flip .pullUpIcon {
-webkit-transform:rotate(0deg) translateZ(0);
}
#pullDown.loading .pullDownIcon, #pullUp.loading .pullUpIcon {
background-position:0 100%;
-webkit-transform:rotate(0deg) translateZ(0);
-webkit-transition-duration:0ms;
-webkit-animation-name:loading;
-webkit-animation-duration:2s;
-webkit-animation-iteration-count:infinite;
-webkit-animation-timing-function:linear;
}
@-webkit-keyframes loading {
from { -webkit-transform:rotate(0deg) translateZ(0); }
to { -webkit-transform:rotate(360deg) translateZ(0); }
}
</style>
</head>
<body>
<div id="header">
<a href="../db.html#page2">iScroll实例：下拉刷新，滚动翻页</a>
</div>
<div id="wrapper">
<div id="scroller">
<div id="pullDown">
<span class="pullDownIcon"></span><span class="pullDownLabel">下拉刷新...</span>
</div>
<ul id="thelist">
<li>我是三冰 1</li>
<li>我是三冰 2</li>
<li>我是三冰 3</li>
<li>我是三冰 4</li>
<li>我是三冰 5</li>
<li>我是三冰 6</li>
<li>我是三冰 7</li>
<li>我是三冰 8</li>
<li>我是三冰 9</li>
<li>我是三冰 10</li>
<li>我是三冰 11</li>
<li>我是三冰 12</li>
<li>我是三冰 13</li>
</ul>
<div id="pullUp">
<span class="pullUpIcon"></span><span class="pullUpLabel">上拉加载更多...</span>
</div>
</div>
</div>
<div id="footer"></div><script type="application/javascript" src="iscroll.js"></script>
<script type="text/javascript">
var myScroll,
pullDownEl, pullDownOffset,
pullUpEl, pullUpOffset,
generatedCount = 0;
/**
* 下拉刷新 （自定义实现此方法）
* myScroll.refresh(); // 数据加载完成后，调用界面更新方法
*/
function pullDownAction () {
setTimeout(function () { // <-- Simulate network congestion, remove setTimeout from production!
var el, li, i;
el = document.getElementById('thelist');
for (i=0; i<3; i++) {
li = document.createElement('li');
li.innerText = '添加三冰 ' + (++generatedCount);
el.insertBefore(li, el.childNodes[0]);
}
myScroll.refresh(); //数据加载完成后，调用界面更新方法 Remember to refresh when contents are loaded (ie: on ajax completion)
}, 1000); // <-- Simulate network congestion, remove setTimeout from production!
}
/**
* 滚动翻页 （自定义实现此方法）
* myScroll.refresh(); // 数据加载完成后，调用界面更新方法
*/
function pullUpAction () {
setTimeout(function () { // <-- Simulate network congestion, remove setTimeout from production!
var el, li, i;
el = document.getElementById('thelist');
for (i=0; i<3; i++) {
li = document.createElement('li');
li.innerText = '添加三冰 ' + (++generatedCount);
el.appendChild(li, el.childNodes[0]);
}
myScroll.refresh(); // 数据加载完成后，调用界面更新方法 Remember to refresh when contents are loaded (ie: on ajax completion)
}, 1000); // <-- Simulate network congestion, remove setTimeout from production!
}
/**
* 初始化iScroll控件
*/
function loaded() {
pullDownEl = document.getElementById('pullDown');
pullDownOffset = pullDownEl.offsetHeight;
pullUpEl = document.getElementById('pullUp');
pullUpOffset = pullUpEl.offsetHeight;
myScroll = new iScroll('wrapper', {
scrollbarClass: 'myScrollbar', /* 重要样式 */
useTransition: false, /* 此属性不知用意，本人从true改为false */
topOffset: pullDownOffset,
onRefresh: function () {
if (pullDownEl.className.match('loading')) {
pullDownEl.className = '';
pullDownEl.querySelector('.pullDownLabel').innerHTML = '下拉刷新...';
} else if (pullUpEl.className.match('loading')) {
pullUpEl.className = '';
pullUpEl.querySelector('.pullUpLabel').innerHTML = '上拉加载更多...';
}
},
onScrollMove: function () {
if (this.y > 5 && !pullDownEl.className.match('flip')) {
pullDownEl.className = 'flip';
pullDownEl.querySelector('.pullDownLabel').innerHTML = '松手开始更新...';
this.minScrollY = 0;
} else if (this.y < 5 && pullDownEl.className.match('flip')) {
pullDownEl.className = '';
pullDownEl.querySelector('.pullDownLabel').innerHTML = '下拉刷新...';
this.minScrollY = -pullDownOffset;
} else if (this.y < (this.maxScrollY - 5) && !pullUpEl.className.match('flip')) {
pullUpEl.className = 'flip';
pullUpEl.querySelector('.pullUpLabel').innerHTML = '松手开始更新...';
this.maxScrollY = this.maxScrollY;
} else if (this.y > (this.maxScrollY + 5) && pullUpEl.className.match('flip')) {
pullUpEl.className = '';
pullUpEl.querySelector('.pullUpLabel').innerHTML = '上拉加载更多...';
this.maxScrollY = pullUpOffset;
}
},
onScrollEnd: function () {
if (pullDownEl.className.match('flip')) {
pullDownEl.className = 'loading';
pullDownEl.querySelector('.pullDownLabel').innerHTML = '加载中...';
pullDownAction(); // Execute custom function (ajax call?)
} else if (pullUpEl.className.match('flip')) {
pullUpEl.className = 'loading';
pullUpEl.querySelector('.pullUpLabel').innerHTML = '加载中...';
pullUpAction(); // Execute custom function (ajax call?)
}
}
});
setTimeout(function () { document.getElementById('wrapper').style.left = '0'; }, 800);
}
//初始化绑定iScroll控件
document.addEventListener('touchmove', function (e) { e.preventDefault(); }, false);
document.addEventListener('DOMContentLoaded', loaded, false);
</script></body>
</html>
以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持脚本之家。
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