<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<meta name="author" content="daiqingyun">
<title>mouse event</title>
<style media="screen">
* {
padding: 0;
margin: 0;
}
ul {
list-style: none;
position: relative;
margin: 50px 300px;
font-size: 0;
}
ul > li {
position: relative;
width: 100px;
height: 100px;
background-color: rgb(213,213,213);
display: inline-block;
margin: 10px;
overflow: hidden;
}
ul > li .bg {
position: absolute;
width: 100px;
height: 100px;
left: -100%;
top: 0;
background-color: rgb(212,23,222);
text-align: center;
line-height: 100px;
cursor: pointer;
}
.bg > p {
color: #fff;
font-size: 20px;
}
</style>
</head>
<body>
<ul>
<li>
<div class="bg">
<p>JS</p>
</div>
</li>
<li>
<div class="bg">
<p>CSS3</p>
</div>
</li>
<li>
<div class="bg">
<p>HTML5</p>
</div>
</li>
<li>
<div class="bg">
<p>Web</p>
</div>
</li>
<li>
<div class="bg">
<p>Object</p>
</div>
</li>
</ul>
<script type="text/javascript">
/*
options中的参数:
触发事件的载体: targetElement
执行动画的载体: animationElement
*/
function HoverAction(options) {
if(!options.targetElement || !options.animationElement) {
return false;
}
this.targetElement = options.targetElement;
this.animationElement = options.animationElement;
this.timeId = null;
this.speed = "0.3s";
}
HoverAction.prototype.addEvent = function() {
//保存this的指向
var _this = this;
_this.targetElement.addEventListener('mouseenter',function(e){
//得到鼠标的坐标
var point = {
x: e.pageX,
y: e.pageY
}
console.log(point);
//获得方向
var dir = getDirection(_this.targetElement,startPoint(_this.targetElement),point);
clearTimeout(_this.timeId);
//取消过渡动画(防止重置动画载体位置时触发过渡效果)
_this.animationElement.style.transition = "";
//得到运动的方向，要确定动画载体的开始位置
switch(dir){
case 1:
_this.animationElement.style.top = "-100%";
_this.animationElement.style.left = "0";
break;
case 2:
_this.animationElement.style.top = "100%";
_this.animationElement.style.left = "0";
break;
case 3:
_this.animationElement.style.top = "0";
_this.animationElement.style.left = "-100%";
break;
case 4:
_this.animationElement.style.top = "0";
_this.animationElement.style.left = "100%";
break;
}
//异步执行
_this.timeId = setTimeout(function(){
animation({
obj: _this.animationElement,
speed: _this.speed,
changeStyle: function(){
this.style.top = "0";
this.style.left = "0";
}
});
},20);
},false);
_this.targetElement.addEventListener('mouseleave',function(e){
var left,top;
var point = {
x: e.pageX,
y: e.pageY
}
clearTimeout(_this.timeId);
_this.animationElement.style.transition = "";
var dir = getDirection(_this.targetElement,startPoint(_this.targetElement),point);
switch(dir) {
case 1:
top = '-100%';
left = '0';
break;
case 2:
top = '100%';
left = "0";
break;
case 3:
left = "-100%";
top = "0";
break;
case 4:
left = "100%";
top = "0";
break;
}
_this.timeId = setTimeout(function(){
animation({
obj: _this.animationElement,
speed: _this.speed,
changeStyle: function(){
this.style.top = top;
this.style.left = left;
}
});
},20);
},false);
}
//动画
function animation(options) {
if(!options.obj) {
return false;
}
options.speed = options.speed || '0.5s';
options.obj.style.transition = "all " + options.speed + " ease-in-out";
options.changeStyle.call(options.obj);
var flag = false;
options.obj.addEventListener('transitionend',function(){
//这里主要是transitionend对于每个属性运动完多会走一遍
if(!flag) {
options.callback && options.callback();
flag = true;
}
},false);
}
//获取元素左上角的坐标
function startPoint(element){
var x = 0,y = 0;
while(element!=null) {
x += element.offsetLeft;
y += element.offsetTop;
element = element.offsetParent
}
return {
x: x,
y: y
}
}
//得到元素运动的方向
function getDirection(element,startPoint,pagePoint){
var halfWidth = element.offsetWidth / 2,halfHeight = element.offsetHeight / 2;
//得到中心点
var center = {
x: startPoint.x + halfWidth,
y: startPoint.y + halfHeight
}
//得到鼠标偏离中心点的距离
var disX = pagePoint.x - center.x;
var disY = pagePoint.y - center.y;
if(disY < 0 && Math.abs(disY / disX) >= 1) {
//上方
return 1;
}
else if(disY > 0 && Math.abs(disY / disX) >= 1) {
//下
return 2;
}
else if(disX < 0 && Math.abs(disY / disX) < 1) {
//左
return 3;
}
else {
//右
return 4;
}
}
var list = document.querySelectorAll('li');
var div = document.querySelectorAll('.bg');
var len = list.length;
for(var i = 0; i < len; i++) {
var options = {
targetElement: list[i],
animationElement: div[i]
}
var temp = new HoverAction(options);
temp.addEvent();
}
</script>
</body>
</html>
