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
我将这里的一些答案合并到一个脚本中，该脚本使用CustomEvent在DOM中触发滑动事件。添加0.7k的swiped-events.min.js脚本到你的页面，并监听滑动事件:
刷卡
document.addEventListener('swiped', function(e) {
console.log(e.target); // the element that was swiped
console.log(e.detail.dir); // swiped direction
});
swiped-left
document.addEventListener('swiped-left', function(e) {
console.log(e.target); // the element that was swiped
});
swiped-right
document.addEventListener('swiped-right', function(e) {
console.log(e.target); // the element that was swiped
});
swiped-up
document.addEventListener('swiped-up', function(e) {
console.log(e.target); // the element that was swiped
});
swiped-down
document.addEventListener('swiped-down', function(e) {
console.log(e.target); // the element that was swiped
});
你也可以直接附加到一个元素:
document.getElementById('myBox').addEventListener('swiped-down', function(e) {
console.log(e.target); // the element that was swiped
});
可选配置
您可以指定以下属性来调整页面中的滑动交互功能(这些是可选的)。
<div data-swipe-threshold="10"
data-swipe-timeout="1000"
data-swipe-ignore="false">
Swiper, get swiping!
</div>
要在应用程序范围内设置默认值，请在最顶部的元素上设置配置属性:
<body data-swipe-threshold="100" data-swipe-timeout="250">
<div>Swipe me</div>
<div>or me</div>
</body>
源代码可在Github
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'
});
})
函数检查水平方向和垂直方向，以确定哪个滑动更长，以防止执行两个指令，因为不可能进行完美的单向滑动。滑动总是在X和Y上有偏差。
let touchstartX = 0;
let touchendX = 0;
let touchstartY = 0;
let touchendY = 0;
function checkDirection() {
let difX = touchstartX - touchendX;
let difY = touchstartY - touchendY;
if (Math.abs(difX) > Math.abs(difY)) {
if (touchendX < touchstartX) {/*left*/}
if (touchendX > touchstartX) {/*right*/}
} else {
if (touchendY < touchstartY) {/*up*/}
if (touchendY > touchstartY) {/*down*/}
}
};
document.addEventListener('touchstart', e => {
e.preventDefault();
touchstartX = e.changedTouches[0].screenX;
touchstartY = e.changedTouches[0].screenY;
});
document.addEventListener('touchend', e => {
e.preventDefault();
touchendX = e.changedTouches[0].screenX;
touchendY = e.changedTouches[0].screenY;
checkDirection();
});
threshold, timeout swipe, swipeBlockElems添加。
document.addEventListener('touchstart', handleTouchStart, false);
document.addEventListener('touchmove', handleTouchMove, false);
document.addEventListener('touchend', handleTouchEnd, false);
const SWIPE_BLOCK_ELEMS = [
'swipBlock',
'handle',
'drag-ruble'
]
let xDown = null;
let yDown = null;
let xDiff = null;
let yDiff = null;
let timeDown = null;
const TIME_THRESHOLD = 200;
const DIFF_THRESHOLD = 130;
function handleTouchEnd() {
let timeDiff = Date.now() - timeDown;
if (Math.abs(xDiff) > Math.abs(yDiff)) { /*most significant*/
if (Math.abs(xDiff) > DIFF_THRESHOLD && timeDiff < TIME_THRESHOLD) {
if (xDiff > 0) {
// console.log(xDiff, TIME_THRESHOLD, DIFF_THRESHOLD)
SWIPE_LEFT(LEFT) /* left swipe */
} else {
// console.log(xDiff)
SWIPE_RIGHT(RIGHT) /* right swipe */
}
} else {
console.log('swipeX trashhold')
}
} else {
if (Math.abs(yDiff) > DIFF_THRESHOLD && timeDiff < TIME_THRESHOLD) {
if (yDiff > 0) {
/* up swipe */
} else {
/* down swipe */
}
} else {
console.log('swipeY trashhold')
}
}
/* reset values */
xDown = null;
yDown = null;
timeDown = null;
}
function containsClassName (evntarget , classArr) {
for (var i = classArr.length - 1; i >= 0; i--) {
if( evntarget.classList.contains(classArr[i]) ) {
return true;
}
}
}
function handleTouchStart(evt) {
let touchStartTarget = evt.target;
if( containsClassName(touchStartTarget, SWIPE_BLOCK_ELEMS) ) {
return;
}
timeDown = Date.now()
xDown = evt.touches[0].clientX;
yDown = evt.touches[0].clientY;
xDiff = 0;
yDiff = 0;
}
function handleTouchMove(evt) {
if (!xDown || !yDown) {
return;
}
var xUp = evt.touches[0].clientX;
var yUp = evt.touches[0].clientY;
xDiff = xDown - xUp;
yDiff = yDown - yUp;
}
我之前使用的方法是，您必须检测mousedown事件，记录其x,y位置(任何相关的位置)，然后检测mouseup事件，并减去两个值。
使用两个:
jQuery移动控件:在大多数情况下都可以工作，特别是当你在开发使用其他jQuery插件的应用程序时，最好使用jQuery移动控件。请访问:https://www.w3schools.com/jquerymobile/jquerymobile_events_touch.asp
锤子时间!一个最好的，轻量级和快速的基于javascript的库。请访问:https://hammerjs.github.io/
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