如何检测用户用JavaScript在网页上向某个方向滑动手指?
我想知道是否有一种解决方案可以同时适用于iPhone和Android手机上的网站。
如何检测用户用JavaScript在网页上向某个方向滑动手指?
我想知道是否有一种解决方案可以同时适用于iPhone和Android手机上的网站。
当前回答
我重新包装了TouchWipe作为一个简短的jquery插件:detectSwipe
其他回答
我必须为旋转木马编写一个简单的脚本,以检测向左或向右的滑动。
我使用指针事件代替触摸事件。
我希望这对个人有用,我欢迎任何改进我的代码的见解;我觉得很不好意思加入这个线程与显著优秀的JS开发人员。
function getSwipeX({elementId}) {
this.e = document.getElementsByClassName(elementId)[0];
this.initialPosition = 0;
this.lastPosition = 0;
this.threshold = 200;
this.diffInPosition = null;
this.diffVsThreshold = null;
this.gestureState = 0;
this.getTouchStart = (event) => {
event.preventDefault();
if (window.PointerEvent) {
this.e.setPointerCapture(event.pointerId);
}
return this.initalTouchPos = this.getGesturePoint(event);
}
this.getTouchMove = (event) => {
event.preventDefault();
return this.lastPosition = this.getGesturePoint(event);
}
this.getTouchEnd = (event) => {
event.preventDefault();
if (window.PointerEvent) {
this.e.releasePointerCapture(event.pointerId);
}
this.doSomething();
this.initialPosition = 0;
}
this.getGesturePoint = (event) => {
this.point = event.pageX
return this.point;
}
this.whatGestureDirection = (event) => {
this.diffInPosition = this.initalTouchPos - this.lastPosition;
this.diffVsThreshold = Math.abs(this.diffInPosition) > this.threshold;
(Math.sign(this.diffInPosition) > 0) ? this.gestureState = 'L' : (Math.sign(this.diffInPosition) < 0) ? this.gestureState = 'R' : this.gestureState = 'N';
return [this.diffInPosition, this.diffVsThreshold, this.gestureState];
}
this.doSomething = (event) => {
let [gestureDelta,gestureThreshold,gestureDirection] = this.whatGestureDirection();
// USE THIS TO DEBUG
console.log(gestureDelta,gestureThreshold,gestureDirection);
if (gestureThreshold) {
(gestureDirection == 'L') ? // LEFT ACTION : // RIGHT ACTION
}
}
if (window.PointerEvent) {
this.e.addEventListener('pointerdown', this.getTouchStart, true);
this.e.addEventListener('pointermove', this.getTouchMove, true);
this.e.addEventListener('pointerup', this.getTouchEnd, true);
this.e.addEventListener('pointercancel', this.getTouchEnd, true);
}
}
可以使用new调用该函数。
window.addEventListener('load', () => {
let test = new getSwipeX({
elementId: 'your_div_here'
});
})
我也合并了一些答案,主要是第一个和第二个与类,下面是我的版本:
export default class Swipe {
constructor(options) {
this.xDown = null;
this.yDown = null;
this.options = options;
this.handleTouchStart = this.handleTouchStart.bind(this);
this.handleTouchMove = this.handleTouchMove.bind(this);
document.addEventListener('touchstart', this.handleTouchStart, false);
document.addEventListener('touchmove', this.handleTouchMove, false);
}
onLeft() {
this.options.onLeft();
}
onRight() {
this.options.onRight();
}
onUp() {
this.options.onUp();
}
onDown() {
this.options.onDown();
}
static getTouches(evt) {
return evt.touches // browser API
}
handleTouchStart(evt) {
const firstTouch = Swipe.getTouches(evt)[0];
this.xDown = firstTouch.clientX;
this.yDown = firstTouch.clientY;
}
handleTouchMove(evt) {
if ( ! this.xDown || ! this.yDown ) {
return;
}
let xUp = evt.touches[0].clientX;
let yUp = evt.touches[0].clientY;
let xDiff = this.xDown - xUp;
let yDiff = this.yDown - yUp;
if ( Math.abs( xDiff ) > Math.abs( yDiff ) ) {/*most significant*/
if ( xDiff > 0 && this.options.onLeft) {
/* left swipe */
this.onLeft();
} else if (this.options.onRight) {
/* right swipe */
this.onRight();
}
} else {
if ( yDiff > 0 && this.options.onUp) {
/* up swipe */
this.onUp();
} else if (this.options.onDown){
/* down swipe */
this.onDown();
}
}
/* reset values */
this.xDown = null;
this.yDown = null;
}
}
之后可以这样使用:
let swiper = new Swipe({
onLeft() {
console.log('You swiped left.');
}
});
当你只想调用“onLeft”方法时,它有助于避免控制台错误。
再加上这个答案。这个增加了对鼠标事件的支持,用于桌面测试:
<!--scripts-->
class SwipeEventDispatcher {
constructor(element, options = {}) {
this.evtMap = {
SWIPE_LEFT: [],
SWIPE_UP: [],
SWIPE_DOWN: [],
SWIPE_RIGHT: []
};
this.xDown = null;
this.yDown = null;
this.element = element;
this.isMouseDown = false;
this.listenForMouseEvents = true;
this.options = Object.assign({ triggerPercent: 0.3 }, options);
element.addEventListener('touchstart', evt => this.handleTouchStart(evt), false);
element.addEventListener('touchend', evt => this.handleTouchEnd(evt), false);
element.addEventListener('mousedown', evt => this.handleMouseDown(evt), false);
element.addEventListener('mouseup', evt => this.handleMouseUp(evt), false);
}
on(evt, cb) {
this.evtMap[evt].push(cb);
}
off(evt, lcb) {
this.evtMap[evt] = this.evtMap[evt].filter(cb => cb !== lcb);
}
trigger(evt, data) {
this.evtMap[evt].map(handler => handler(data));
}
handleTouchStart(evt) {
this.xDown = evt.touches[0].clientX;
this.yDown = evt.touches[0].clientY;
}
handleMouseDown(evt) {
if (this.listenForMouseEvents==false) return;
this.xDown = evt.clientX;
this.yDown = evt.clientY;
this.isMouseDown = true;
}
handleMouseUp(evt) {
if (this.isMouseDown == false) return;
const deltaX = evt.clientX - this.xDown;
const deltaY = evt.clientY - this.yDown;
const distMoved = Math.abs(Math.abs(deltaX) > Math.abs(deltaY) ? deltaX : deltaY);
const activePct = distMoved / this.element.offsetWidth;
if (activePct > this.options.triggerPercent) {
if (Math.abs(deltaX) > Math.abs(deltaY)) {
deltaX < 0 ? this.trigger('SWIPE_LEFT') : this.trigger('SWIPE_RIGHT');
} else {
deltaY > 0 ? this.trigger('SWIPE_UP') : this.trigger('SWIPE_DOWN');
}
}
}
handleTouchEnd(evt) {
const deltaX = evt.changedTouches[0].clientX - this.xDown;
const deltaY = evt.changedTouches[0].clientY - this.yDown;
const distMoved = Math.abs(Math.abs(deltaX) > Math.abs(deltaY) ? deltaX : deltaY);
const activePct = distMoved / this.element.offsetWidth;
if (activePct > this.options.triggerPercent) {
if (Math.abs(deltaX) > Math.abs(deltaY)) {
deltaX < 0 ? this.trigger('SWIPE_LEFT') : this.trigger('SWIPE_RIGHT');
} else {
deltaY > 0 ? this.trigger('SWIPE_UP') : this.trigger('SWIPE_DOWN');
}
}
}
}
// add a listener on load
window.addEventListener("load", function(event) {
const dispatcher = new SwipeEventDispatcher(document.body);
dispatcher.on('SWIPE_RIGHT', () => { console.log('I swiped right!') })
dispatcher.on('SWIPE_LEFT', () => { console.log('I swiped left!') })
});
touchStart和touchEnd的句柄:
var handleSwipe = function(elem,callbackOnRight, callbackOnLeft, callbackOnDown,
callbackOnUp) => {
elem.ontouchstart = handleTouchStart;
elem.ontouchend = handleTouchEnd;
var xDown = null;
var yDown = null;
function getTouches(evt) {
return evt.touches || // browser API
evt.originalEvent.touches; // jQuery
}
function handleTouchStart(evt) {
const firstTouch = getTouches(evt)[0];
xDown = firstTouch.clientX;
yDown = firstTouch.clientY;
};
function handleTouchEnd(evt) {
if (!xDown || !yDown) {
return;
}
var xUp = evt.changedTouches[0].clientX;
var yUp = evt.changedTouches[0].clientY;
var xDiff = xDown - xUp;
var yDiff = yDown - yUp;
var minDif = 30;
console.log(`xDiff:${xDiff}, yDiff:${yDiff}`);
if (Math.abs(xDiff) > Math.abs(yDiff)) {
if (xDiff > minDif) {
if (callbackOnLeft)
callbackOnLeft();
} else if (xDiff < -1 * minDif){
if (callbackOnRight)
callbackOnRight();
}
} else {
if (yDiff > minDif) {
if (callbackOnDown)
callbackOnDown();
} else if (yDiff < -1* minDif){
if (callbackOnUp)
callbackOnUp();
}
}
xDown = null;
yDown = null;
};
}
如果有人试图在Android上使用jQuery Mobile,并且有JQM滑动检测的问题
(我在Xperia Z1, Galaxy S3, Nexus 4和一些Wiko手机上也有一些)这可能很有用:
//Fix swipe gesture on android
if(android){ //Your own device detection here
$.event.special.swipe.verticalDistanceThreshold = 500
$.event.special.swipe.horizontalDistanceThreshold = 10
}
在android上的滑动不会被检测到,除非它是一个非常长、精确和快速的滑动。
这两条线可以正常工作