transitionend事件代表着过渡动画结束后
原生的绑定方法
obj.addEventListener('transitionEnd', function(){
//do soming
})
我们能拿这个过渡结束事件做些什么事呢？
比如我们在用CSS3写的一个过渡动画，当过渡结束后，进行回调，
下面给出一个小案例
当我们用CSS3过渡去写一个无缝的轮播，过渡结束时候判断图片是否到达了最后一张，然后进行去掉过渡属性，并回到第一张图片的位置。
主意:该案例是移动端的案例，处理了webkit内核浏览器的性能加速，建议用chrome测试
<!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,minimum-scale=1,maximum-scale=1,user-scalable=no" />
<title>transitonend实现的轮播案例</title>
</head> <style type="text/css">
* {
margin: 0;
padding: 0;
} li {
list-style: none;
} #wrap {
width: 26.66666667rem;
margin: 0 auto;
overflow: hidden;
position: relative;
height: 8.544166667rem;
} .banner {
position: absolute;
left: 0px;
} .banner li {
width: 26.66666667rem;
float: left;
height: 8.544166667rem;
} img {
width: 100%;
} .change {
position: absolute;
bottom: 1rem;
text-align: center;
width: 100%;
opacity: 0.8;
} .change li {
display: inline-block;
width: 0.5rem;
height: 0.5rem;
border-radius: 50%;
background: #666;
margin: 0 0.2rem;
} .change .on {
background: red;
}
</style> <body>
<div id="wrap"></div>
</body> <script type="text/javascript">
//控制跟元素的rem
function initSize() {
var win_w = document.body.offsetWidth;
var min_w;
var fontSize;
if(win_w > 640) {
fontSize = 24;
} else {
min_w = Math.max(320, win_w);
fontSize = min_w / 320 * 12
}
document.getElementsByTagName('html')[0].style.fontSize = fontSize + 'px';
} onresize = initSize;
initSize();
function Slider(opts) {
this.wrap = opts.obj;
this.list = opts.list;
this.nav = opts.nav;
this.time = opts.time;
//构造三部曲
this.init()
this.renderDom();
this.bindDom();
}
//初始化
Slider.prototype.init = function() {
this.index = 0;
this.scale = this.wrap.offsetWidth;
}
//动画函数原型链
Slider.prototype.go = function(n) {
var that = this;
var Oul = that.Oul;
var index = that.index;
var scale = that.scale;
var lis = Oul.getElementsByTagName('li');
var len = that.list.length;
var i; Oul.style.webkitTransition = 'all 0.2s ease-out';
i = index + n * 1;
Oul.addEventListener('webkitTransitionEnd', function() {
if(i >= len - 2) {
Oul.style.webkitTransition = 'none';
Oul.style.left = -that.scale + 'px';
i = 0;
//小圆点部分判断
if(that.nav) {
that.Ouli.firstChild.className = 'on';
}
} else if(i < 0) {
i = len - 3;
Oul.style.webkitTransition = 'none';
Oul.style.left = -(len - 2) * that.scale + 'px';
//小圆点部分判断
if(that.nav) {
that.Ouli.lastChild.className = 'on';
}
}
//保留当前图片索引值
that.index = i;
})
Oul.style.left = -(i + 1) * that.scale + 'px';
//开启小圆点
if(that.nav) {
var Ouli = that.Ouli.getElementsByTagName('li');
for(var a = 0; a < len - 2; a++) {
if(Ouli[a].className == 'on') {
Ouli[a].className = '';
}
}
Ouli[i] && (Ouli[i].className = 'on');
} }
//渲染页面的原型链
Slider.prototype.renderDom = function() {
var wrap = this.wrap;
var data = this.list;
var len = data.length;
var scale = this.scale
//创建函数
this.Oul = document.createElement('ul');
//遍历图片数据
for(var i = 0; i < len; i++) {
var li = document.createElement('li');
var item = data[i];
if(item) {
li.innerHTML = '<img src="' + item['src'] + '"/>'
} this.Oul.appendChild(li);
}
this.Oul.className = 'banner';
this.Oul.style.left = -scale + 'px';
this.Oul.style.width = +len * scale + 'px'
wrap.appendChild(this.Oul);
//开启小圆点
if(this.nav) {
this.Ouli = document.createElement('ul');
for(var i = 0; i < len - 2; i++) {
var li = document.createElement('li');
this.Ouli.appendChild(li);
}
this.Ouli.className = 'change';
wrap.appendChild(this.Ouli);
this.Ouli.firstChild.className = 'on';
} }
//绑定事件函数原型链
Slider.prototype.bindDom = function() {
var that = this;
var len = that.list.length - 2;
var Oul = that.Oul;
var scale = that.scale;
var offsetLeft;
var time = that.time;
//绑定定时器
function next() {
that.go('1')
}
var timer = setInterval(next, time)
//触摸开始
var startHandler = function(event) {
//记录刚开始接触屏幕的时间
that.startTime = new Date() * 1;
//记录刚开始接触屏幕的位置
that.startX = event.touches[0].pageX;
//清楚偏移量
that.offsetX = 0;
offsetLeft = Oul.offsetLeft;
//清楚定时器
clearInterval(timer);
}
//触摸滑动过程
var moveHandler = function(event) {
//阻止浏览器默认触摸事件
event.preventDefault();
//计算偏移量
that.offsetX = event.touches[0].pageX - that.startX;
//图片随手指移动
Oul.style.webkitTransition = 'none';
Oul.style.left = +offsetLeft + that.offsetX + 'px'; }
//触摸结束
var endHandler = function(event) {
//记录手指离开屏幕时的位置
var endTime = new Date() * 1;
//获取滑动边界值
var boundary = scale / 3
//判断快滑动还是慢滑动
if(endTime - that.startTime > 300) {
if(that.offsetX > boundary) {
//下一页
that.go('-1');
} else if(that.offsetX < -boundary) {
//上一页
that.go('1');
} else {
//留在本页
that.go('0');
}
} else {
if(that.offsetX > 50) {
that.go('-1');
} else if(that.offsetX < -50) {
that.go('1');
} else {
that.go('0');
}
}
timer = setInterval(next, time);
} //事件绑定
Oul.addEventListener('touchstart', startHandler);
Oul.addEventListener('touchmove', moveHandler);
Oul.addEventListener('touchend', endHandler);
} var list = [{
src: 'img/5.jpg'
}, {
src: 'img/1.jpg'
}, {
src: 'img/2.jpg'
}, {
src: 'img/3.jpg'
}, {
src: 'img/4.jpg'
}, {
src: 'img/5.jpg'
}, {
src: 'img/1.jpg'
}]; new Slider({
//传入对象
'obj': document.getElementById('wrap'),
//传入数据
'list': list,
//是否开启小圆点，默认是false
'nav': true,
//自动播放时间
'time': 3500
})
</script> </html>