js implements touch mobile touch screen sliding event_javascript skills
The effect of mobile touch screen sliding is actually a picture carousel, which can be easily implemented on PC pages by binding events such as click and mouseover. But on mobile devices, to achieve this carousel effect, you need to use the core touch event. Handling touch events can track each finger sliding on the screen.
The following are four touch events
touchstart: //Triggered when your finger is placed on the screen
touchmove: //Trigger by sliding your finger on the screen
touchend: //Triggered when the finger leaves the screen
touchcancel: //Triggered when the system cancels the touch event. This seems to be less used
After each touch event is triggered, an event object will be generated. The event object additionally includes the following three touch lists
touches: //List of all fingers on the current screen
targetTouches: //List of fingers on the current dom element, try to use this instead of touches
changedTouches: //List of fingers involved in the current event, try to use this instead of touches
Each touch in these lists consists of a touch object, which contains touch information. The main attributes are as follows:
clientX / clientY: //The position of the touch point relative to the browser window
pageX / pageY: //The position of the touch point relative to the page
screenX / screenY: //The position of the touch point relative to the screen
identifier: //ID of touch object
target: //Current DOM element
Note:
When your finger slides across the screen, it will affect browser behavior, such as scrolling and zooming. Therefore, when calling the touch event, be careful to prohibit zooming and scrolling.
1. No zooming
Set via meta tag.
2. No scrolling
preventDefault prevents the default behavior, and the default behavior of touch events is scrolling.
event.preventDefault();
Use cases:
<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-Type" Content="text/html; charset=utf-8;">
<title>移动端触摸滑动</title>
<meta name="author" content="rainna" />
<meta name="keywords" content="rainna's js lib" />
<meta name="description" content="移动端触摸滑动" />
<meta name="viewport" content="target-densitydpi=320,width=640,user-scalable=no">
<style>
*{margin:0;padding:0;}
li{list-style:none;}.m-slider{width:600px;margin:50px 20px;overflow:hidden;}
.m-slider .cnt{position:relative;left:0;width:3000px;}
.m-slider .cnt li{float:left;width:600px;}
.m-slider .cnt img{display:block;width:100%;height:450px;}
.m-slider .cnt p{margin:20px 0;}
.m-slider .icons{text-align:center;color:#000;}
.m-slider .icons span{margin:0 5px;}
.m-slider .icons .curr{color:red;}
.f-anim{-webkit-transition:left .2s linear;}
</style>
</head>
<body>
<div class="m-slider">
<ul class="cnt" id="slider">
<li>
<img src="/static/imghwm/default1.png" data-src="http://imglf1.ph.126.net/qKodH3sZoVbPalKFtHS9mw==/6608946691259322175.jpg" class="lazy" alt="js implements touch mobile touch screen sliding event_javascript skills" >
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</li>
<li>
<img src="/static/imghwm/default1.png" data-src="http://imglf1.ph.126.net/40-jqH_j6EoCWnZOixY2pA==/4798022453110310215.jpg" class="lazy" alt="js implements touch mobile touch screen sliding event_javascript skills" >
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</li>
<li>
<img src="/static/imghwm/default1.png" data-src="http://imglf0.ph.126.net/Jnmi2y51zVdjKAYlibtpFw==/3068640196117481166.jpg" class="lazy" alt="js implements touch mobile touch screen sliding event_javascript skills" >
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</li>
<li>
<img src="/static/imghwm/default1.png" data-src="http://imglf1.ph.126.net/79GPsjhwiIj8e-0nP5MsEQ==/6619295294699949331.jpg" class="lazy" alt="js implements touch mobile touch screen sliding event_javascript skills" >
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</li>
<li>
<img src="/static/imghwm/default1.png" data-src="http://imglf1.ph.126.net/40-jqH_j6EoCWnZOixY2pA==/4798022453110310215.jpg" class="lazy" alt="js implements touch mobile touch screen sliding event_javascript skills" >
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</li>
</ul>
<div class="icons" id="icons">
<span class="curr">1</span>
<span>2</span>
<span>3</span>
<span>4</span>
<span>5</span>
</div>
</div>
<script>
var slider = {
//判断设备是否支持touch事件
touch:('ontouchstart' in window) || window.DocumentTouch && document instanceof DocumentTouch,
slider:document.getElementById('slider'),
//事件
events:{
index:0, //显示元素的索引
slider:this.slider, //this为slider对象
icons:document.getElementById('icons'),
icon:this.icons.getElementsByTagName('span'),
handleEvent:function(event){
var self = this; //this指events对象
if(event.type == 'touchstart'){
self.start(event);
}else if(event.type == 'touchmove'){
self.move(event);
}else if(event.type == 'touchend'){
self.end(event);
}
},
//滑动开始
start:function(event){
var touch = event.targetTouches[0]; //touches数组对象获得屏幕上所有的touch，取第一个touch
startPos = {x:touch.pageX,y:touch.pageY,time:+new Date}; //取第一个touch的坐标值
isScrolling = 0; //这个参数判断是垂直滚动还是水平滚动
this.slider.addEventListener('touchmove',this,false);
this.slider.addEventListener('touchend',this,false);
},
//移动
move:function(event){
//当屏幕有多个touch或者页面被缩放过，就不执行move操作
if(event.targetTouches.length > 1 || event.scale && event.scale !== 1) return;
var touch = event.targetTouches[0];
endPos = {x:touch.pageX - startPos.x,y:touch.pageY - startPos.y};
isScrolling = Math.abs(endPos.x) < Math.abs(endPos.y) ? 1:0; //isScrolling为1时，表示纵向滑动，0为横向滑动
if(isScrolling === 0){
event.preventDefault(); //阻止触摸事件的默认行为，即阻止滚屏
this.slider.className = 'cnt';
this.slider.style.left = -this.index*600 + endPos.x + 'px';
}
},
//滑动释放
end:function(event){
var duration = +new Date - startPos.time; //滑动的持续时间
if(isScrolling === 0){ //当为水平滚动时
this.icon[this.index].className = '';
if(Number(duration) > 10){
//判断是左移还是右移，当偏移量大于10时执行
if(endPos.x > 10){
if(this.index !== 0) this.index -= 1;
}else if(endPos.x < -10){
if(this.index !== this.icon.length-1) this.index += 1;
}
}
this.icon[this.index].className = 'curr';
this.slider.className = 'cnt f-anim';
this.slider.style.left = -this.index*600 + 'px';
}
//解绑事件
this.slider.removeEventListener('touchmove',this,false);
this.slider.removeEventListener('touchend',this,false);
}
},
//初始化
init:function(){
var self = this; //this指slider对象
if(!!self.touch) self.slider.addEventListener('touchstart',self.events,false); //addEventListener第二个参数可以传一个对象，会调用该对象的handleEvent属性
}
};
slider.init();
</script>
</body>
</html>
The above is the entire content of this article, I hope you all like it.
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