前端ABCJS_touch介绍
touchstart:当手指触摸屏幕时触发；即使已经有一个手指放在了屏幕上也会触发。
touchmove:当手指在屏幕上滑动时连续的触发。在这个事件发生期间，调用preventDefault()可阻止滚动。
touchend:当手指从屏幕上移开时触发。
touchcancel:当系统停止跟踪触摸时触发。关于此事件的确切触发事件，文档中没有明确说明。
以上事件的event对象上面都存在如下属性：
touches:表示当前跟踪的触摸操作的Touch对象的数组。
targetTouches:特定于事件目标的Touch对象的数组。
changeTouches:表示自上次触摸以来发生了什么改变的Touch对象的数组。
每个Touch对象包含下列属性：
clientX:触摸目标在视口中的X坐标。
clientY:触摸目标在视口中的Y坐标。
identifier：表示触摸的唯一ID。
pageX：触摸目标在页面中的x坐标。
pageY：触摸目标在页面中的y坐标。
screenX:触摸目标在屏幕中的x坐标。
screenY:触摸目标在屏幕中的y坐标。
target:触摸的DOM节点坐标
阻止事件的默认动作
event.preventDefault()
本文运用到了Zepto.js 的swipeLeft（左滑），swipeRight（右滑）函数
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>图片轮播</title>
<style type="text/css">
*{margin: 0;padding: 0;list-style: none;}
.pictrue{width: 100%;margin:0 auto;position:relative;height: 200px;background-color: white;overflow: hidden;margin-bottom: 5px;}
.images{height: 200px;}
.images li{height: 200px;float: left;}
.images li img{height: 200px;width: 100%;}
.index{height: 10px;margin-top: -30px;position: absolute;width: 100%;text-align: center}
.index ul{display: inline-block;}
.index li{width: 10px;height: 10px;border-radius:10px;background-color:#9a9a9a;float: left;margin-right: 8px;}
.index li.on{background-color: white;}
</style>
</head>
<body>
</body>
<script src="http://www.zeptojs.cn/zepto.min.js"></script>
<div class="pictrue">
<ul class="images">
<li style="background-color: red;"><img alt="" src="https://ss0.bdstatic.com/5aV1bjqh_Q23odCf/static/superman/img/logo/logo_white_fe6da1ec.png"></li>
<li style="background-color: gray;"><img alt="" src="https://ss0.bdstatic.com/5aV1bjqh_Q23odCf/static/superman/img/logo/logo_white_fe6da1ec.png"></li>
<li style="background-color: green;"><img alt="" src="https://ss0.bdstatic.com/5aV1bjqh_Q23odCf/static/superman/img/logo/logo_white_fe6da1ec.png"></li>
<li style="background-color: black;"><img alt="" src="https://ss0.bdstatic.com/5aV1bjqh_Q23odCf/static/superman/img/logo/logo_white_fe6da1ec.png"></li>
</ul>
<div class="index">
<ul>
<li class="on"></li>
<li></li>
<li></li>
<li></li>
</ul>
</div>
</div>
<script type="text/javascript">
//zepto对移动端滑动扩展
;(function($){
var touch = {},
touchTimeout, tapTimeout, swipeTimeout, longTapTimeout,
longTapDelay = 750,
gesture
function swipeDirection(x1, x2, y1, y2) {
return Math.abs(x1 - x2) >=
Math.abs(y1 - y2) ? (x1 - x2 > 0 ? 'Left' : 'Right') : (y1 - y2 > 0 ? 'Up' : 'Down')
}
function longTap() {
longTapTimeout = null
if (touch.last) {
touch.el.trigger('longTap')
touch = {}
}
}
function cancelLongTap() {
if (longTapTimeout) clearTimeout(longTapTimeout)
longTapTimeout = null
}
function cancelAll() {
if (touchTimeout) clearTimeout(touchTimeout)
if (tapTimeout) clearTimeout(tapTimeout)
if (swipeTimeout) clearTimeout(swipeTimeout)
if (longTapTimeout) clearTimeout(longTapTimeout)
touchTimeout = tapTimeout = swipeTimeout = longTapTimeout = null
touch = {}
}
function isPrimaryTouch(event){
return (event.pointerType == 'touch' ||
event.pointerType == event.MSPOINTER_TYPE_TOUCH)
&& event.isPrimary
}
function isPointerEventType(e, type){
return (e.type == 'pointer'+type ||
e.type.toLowerCase() == 'mspointer'+type)
}
$(document).ready(function(){
var now, delta, deltaX = 0, deltaY = 0, firstTouch, _isPointerType
if ('MSGesture' in window) {
gesture = new MSGesture()
gesture.target = document.body
}
$(document)
.bind('MSGestureEnd', function(e){
var swipeDirectionFromVelocity =
e.velocityX > 1 ? 'Right' : e.velocityX < -1 ? 'Left' : e.velocityY > 1 ? 'Down' : e.velocityY < -1 ? 'Up' : null
if (swipeDirectionFromVelocity) {
touch.el.trigger('swipe')
touch.el.trigger('swipe'+ swipeDirectionFromVelocity)
}
})
.on('touchstart MSPointerDown pointerdown', function(e){
if((_isPointerType = isPointerEventType(e, 'down')) &&
!isPrimaryTouch(e)) return
firstTouch = _isPointerType ? e : e.touches[0]
if (e.touches && e.touches.length === 1 && touch.x2) {
// Clear out touch movement data if we have it sticking around
// This can occur if touchcancel doesn't fire due to preventDefault, etc.
touch.x2 = undefined
touch.y2 = undefined
}
now = Date.now()
delta = now - (touch.last || now)
touch.el = $('tagName' in firstTouch.target ?
firstTouch.target : firstTouch.target.parentNode)
touchTimeout && clearTimeout(touchTimeout)
touch.x1 = firstTouch.pageX
touch.y1 = firstTouch.pageY
if (delta > 0 && delta <= 250) touch.isDoubleTap = true
touch.last = now
longTapTimeout = setTimeout(longTap, longTapDelay)
// adds the current touch contact for IE gesture recognition
if (gesture && _isPointerType) gesture.addPointer(e.pointerId)
})
.on('touchmove MSPointerMove pointermove', function(e){
if((_isPointerType = isPointerEventType(e, 'move')) &&
!isPrimaryTouch(e)) return
firstTouch = _isPointerType ? e : e.touches[0]
cancelLongTap()
touch.x2 = firstTouch.pageX
touch.y2 = firstTouch.pageY
deltaX += Math.abs(touch.x1 - touch.x2)
deltaY += Math.abs(touch.y1 - touch.y2)
})
.on('touchend MSPointerUp pointerup', function(e){
if((_isPointerType = isPointerEventType(e, 'up')) &&
!isPrimaryTouch(e)) return
cancelLongTap()
// swipe
if ((touch.x2 && Math.abs(touch.x1 - touch.x2) > 30) ||
(touch.y2 && Math.abs(touch.y1 - touch.y2) > 30))
swipeTimeout = setTimeout(function() {
if (touch.el){
touch.el.trigger('swipe')
touch.el.trigger('swipe' + (swipeDirection(touch.x1, touch.x2, touch.y1, touch.y2)))
}
touch = {}
}, 0)
// normal tap
else if ('last' in touch)
// don't fire tap when delta position changed by more than 30 pixels,
// for instance when moving to a point and back to origin
if (deltaX < 30 && deltaY < 30) {
// delay by one tick so we can cancel the 'tap' event if 'scroll' fires
// ('tap' fires before 'scroll')
tapTimeout = setTimeout(function() {
// trigger universal 'tap' with the option to cancelTouch()
// (cancelTouch cancels processing of single vs double taps for faster 'tap' response)
var event = $.Event('tap')
event.cancelTouch = cancelAll
// [by paper] fix -> "TypeError: 'undefined' is not an object (evaluating 'touch.el.trigger'), when double tap
if (touch.el) touch.el.trigger(event)
// trigger double tap immediately
if (touch.isDoubleTap) {
if (touch.el) touch.el.trigger('doubleTap')
touch = {}
}
// trigger single tap after 250ms of inactivity
else {
touchTimeout = setTimeout(function(){
touchTimeout = null
if (touch.el) touch.el.trigger('singleTap')
touch = {}
}, 250)
}
}, 0)
} else {
touch = {}
}
deltaX = deltaY = 0
})
// when the browser window loses focus,
// for example when a modal dialog is shown,
// cancel all ongoing events
.on('touchcancel MSPointerCancel pointercancel', cancelAll)
// scrolling the window indicates intention of the user
// to scroll, not tap or swipe, so cancel all ongoing events
$(window).on('scroll', cancelAll)
})
;['swipe', 'swipeLeft', 'swipeRight', 'swipeUp', 'swipeDown',
'doubleTap', 'tap', 'singleTap', 'longTap'].forEach(function(eventName){
$.fn[eventName] = function(callback){ return this.on(eventName, callback) }
})
})(Zepto)
$(function(){
photoCarousel($(".images"),$(".images li"),$(".index ul"),-$(window).width(),$(window).width(),$(".images li").length,3000,1000);
//图片轮播
//$ul 容器,$li 元素,$index 索引,left 当前偏移量,width 一次滚动宽度,parentWidth 容器宽度,size 图片数量,interval 循环滚动间隔 0不循环播放,scrolltime 滚动过程时间
function photoCarousel($ul,$li,$index,left,width,size,interval,scrolltime){
//move 0:默认左滑右滑；1：停止默认事件，图片跟随手势移动，time 时间大于200毫秒图片跟随手势移动 否则执行默认左滑 右滑事件
var inner,move=0,time=0,parentWidth=(size+2)*width;
$ul.width(parentWidth).css("transition-duration","0s").css("-webkit-transition-duration","0s").css("transform", "translate3d("+ left +"px,0px,0px)").css("-webkit-transform", "translate3d("+ left +"px,0px,0px)");
$li.width(width).css("line-height",$ul.height()+"px");
$li.first().before($li.last().clone());
$li.last().after($li.first().clone());
$li.find("img").width(width);
index();
//触屏
//触屏开始
$li.bind("touchstart", function(event) {
if(interval!=0)
clearInterval(inner);
move = event.touches[0].pageX;
time = new Date().getTime();
//事件停止
event.preventDefault();
});
//触屏结束
$li.bind("touchend", function(event) {
if(interval!=0)
inner = auto();
if(move !=0){
$ul.css("transition-duration",(scrolltime/1000.0)+"s").css("-webkit-transition-duration",(scrolltime/1000.0)+"s").css("transform", "translate3d("+ left +"px,0px,0px)").css("-webkit-transform", "translate3d("+ left +"px,0px,0px)");
}
time = new Date().getTime();
event.preventDefault();
});
//触屏移动
$li.bind("touchmove", function(event) {
if(interval!=0)
clearInterval(inner);
if(new Date().getTime()-time>=200){
touch = event.touches[0];
$ul.css("transition-duration","0s").css("-webkit-transition-duration","0s").css("transform", "translate3d("+ (left+touch.pageX-move) +"px,0px,0px)").css("-webkit-transform", "translate3d("+ (left+touch.pageX-move) +"px,0px,0px)");
event.preventDefault();
}
});
//左滑
$li.swipeLeft(function(){
move = 0;
left = -left != parentWidth - width ? left -width : 0;
$ul.css("transition-duration",(scrolltime/1000.0)+"s").css("-webkit-transition-duration",(scrolltime/1000.0)+"s").css("transform", "translate3d("+ left +"px,0px,0px)").css("-webkit-transform", "translate3d("+ left +"px,0px,0px)");
//重置滚动位置
if(-left == (parentWidth - width)){
left = -width;
setTimeout(function(){
$ul.css("transition-duration","0s").css("-webkit-transition-duration","0s").css("transform", "translate3d("+ left +"px,0px,0px)").css("-webkit-transform", "translate3d("+ left +"px,0px,0px)");
},scrolltime);
}
index();
})
//右滑
$li.swipeRight(function(){
move = 0;
left = left !=0 ? left + width : -parentWidth + width;
$ul.css("transition-duration",(scrolltime/1000.0)+"s").css("-webkit-transition-duration",(scrolltime/1000.0)+"s").css("transform", "translate3d("+ left +"px,0px,0px)").css("-webkit-transform", "translate3d("+ left +"px,0px,0px)");
//重置滚动位置
if(left ==0){
left = -(parentWidth - 2*width);
setTimeout(function(){
$ul.css("transition-duration","0s").css("-webkit-transition-duration","0s").css("transform", "translate3d("+ left +"px,0px,0px)").css("-webkit-transform", "translate3d("+ left +"px,0px,0px)");
},scrolltime);
}
index();
})
//更新图片下方焦点
function index(){
$index.children().removeClass("on");
$index.children().eq(-left/width-1).addClass("on");
$index.parent().parent().find(".name").text($li.eq(-left/width-1).find("img").attr("alt"));
}
function auto() {
inner = setInterval(function () {
move = 0;
left = -left != parentWidth - width ? left -width : 0;
$ul.css("transition-duration",(scrolltime/1000.0)+"s").css("-webkit-transition-duration",(scrolltime/1000.0)+"s").css("transform", "translate3d("+ left +"px,0px,0px)").css("-webkit-transform", "translate3d("+ left +"px,0px,0px)");
if(-left == (parentWidth - width)){
left = -width;
setTimeout(function(){
$ul.css("transition-duration","0s").css("-webkit-transition-duration","0s").css("transform", "translate3d("+ left +"px,0px,0px)").css("-webkit-transform", "translate3d("+ left +"px,0px,0px)");
},scrolltime);
}
index();
}, interval);
return inner;
}
//横竖屏切换
$(window).bind("orientationchange", function(event){
clearInterval(inner);
width = $(window).width();
left=-width;
parentWidth=(size+2)*width;
$li.width(width).css("line-height",$ul.height()+"px");
$li.find("img").width(width);
$ul.width(parentWidth).css("transition-duration","0s").css("-webkit-transition-duration","0s").css("transform", "translate3d("+ left +"px,0px,0px)").css("-webkit-transform", "translate3d("+ left +"px,0px,0px)");
index();
if(interval!=0)
inner = auto();
});
if(interval!=0){
auto();
}
}
})
</script>
</html>
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