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。
我遇到了触摸端处理程序连续发射的问题，而用户正在拖着一个手指。我不知道这是不是因为我做错了什么但是我重新连接了这个用touchmove来累积移动touchend实际上触发了回调。
我还需要大量这样的实例，所以我添加了启用/禁用方法。
还有一个阈值，短刷不会触发。每次Touchstart 0的计数器。
您可以动态地更改target_node。创建时启用是可选选项。
/** Usage: */
touchevent = new Modules.TouchEventClass(callback, target_node);
touchevent.enable();
touchevent.disable();
/**
*
* Touch event module
*
* @param method set_target_mode
* @param method __touchstart
* @param method __touchmove
* @param method __touchend
* @param method enable
* @param method disable
* @param function callback
* @param node target_node
*/
Modules.TouchEventClass = class {
constructor(callback, target_node, enable=false) {
/** callback function */
this.callback = callback;
this.xdown = null;
this.ydown = null;
this.enabled = false;
this.target_node = null;
/** move point counts [left, right, up, down] */
this.counts = [];
this.set_target_node(target_node);
/** Enable on creation */
if (enable === true) {
this.enable();
}
}
/**
* Set or reset target node
*
* @param string/node target_node
* @param string enable (optional)
*/
set_target_node(target_node, enable=false) {
/** check if we're resetting target_node */
if (this.target_node !== null) {
/** remove old listener */
this.disable();
}
/** Support string id of node */
if (target_node.nodeName === undefined) {
target_node = document.getElementById(target_node);
}
this.target_node = target_node;
if (enable === true) {
this.enable();
}
}
/** enable listener */
enable() {
this.enabled = true;
this.target_node.addEventListener("touchstart", this.__touchstart.bind(this));
this.target_node.addEventListener("touchmove", this.__touchmove.bind(this));
this.target_node.addEventListener("touchend", this.__touchend.bind(this));
}
/** disable listener */
disable() {
this.enabled = false;
this.target_node.removeEventListener("touchstart", this.__touchstart);
this.target_node.removeEventListener("touchmove", this.__touchmove);
this.target_node.removeEventListener("touchend", this.__touchend);
}
/** Touchstart */
__touchstart(event) {
event.stopPropagation();
this.xdown = event.touches[0].clientX;
this.ydown = event.touches[0].clientY;
/** reset count of moves in each direction, [left, right, up, down] */
this.counts = [0, 0, 0, 0];
}
/** Touchend */
__touchend(event) {
let max_moves = Math.max(...this.counts);
if (max_moves > 500) { // set this threshold appropriately
/** swipe happened */
let index = this.counts.indexOf(max_moves);
if (index == 0) {
this.callback("left");
} else if (index == 1) {
this.callback("right");
} else if (index == 2) {
this.callback("up");
} else {
this.callback("down");
}
}
}
/** Touchmove */
__touchmove(event) {
event.stopPropagation();
if (! this.xdown || ! this.ydown) {
return;
}
let xup = event.touches[0].clientX;
let yup = event.touches[0].clientY;
let xdiff = this.xdown - xup;
let ydiff = this.ydown - yup;
/** Check x or y has greater distance */
if (Math.abs(xdiff) > Math.abs(ydiff)) {
if (xdiff > 0) {
this.counts[0] += Math.abs(xdiff);
} else {
this.counts[1] += Math.abs(xdiff);
}
} else {
if (ydiff > 0) {
this.counts[2] += Math.abs(ydiff);
} else {
this.counts[3] += Math.abs(ydiff);
}
}
}
}
我重新包装了TouchWipe作为一个简短的jquery插件:detectSwipe
根据@givanse的回答，以下是你可以用类来做的:
class Swipe {
constructor(element) {
this.xDown = null;
this.yDown = null;
this.element = typeof(element) === 'string' ? document.querySelector(element) : element;
this.element.addEventListener('touchstart', function(evt) {
this.xDown = evt.touches[0].clientX;
this.yDown = evt.touches[0].clientY;
}.bind(this), false);
}
onLeft(callback) {
this.onLeft = callback;
return this;
}
onRight(callback) {
this.onRight = callback;
return this;
}
onUp(callback) {
this.onUp = callback;
return this;
}
onDown(callback) {
this.onDown = callback;
return this;
}
handleTouchMove(evt) {
if ( ! this.xDown || ! this.yDown ) {
return;
}
var xUp = evt.touches[0].clientX;
var yUp = evt.touches[0].clientY;
this.xDiff = this.xDown - xUp;
this.yDiff = this.yDown - yUp;
if ( Math.abs( this.xDiff ) > Math.abs( this.yDiff ) ) { // Most significant.
if ( this.xDiff > 0 ) {
this.onLeft();
} else {
this.onRight();
}
} else {
if ( this.yDiff > 0 ) {
this.onUp();
} else {
this.onDown();
}
}
// Reset values.
this.xDown = null;
this.yDown = null;
}
run() {
this.element.addEventListener('touchmove', function(evt) {
this.handleTouchMove(evt).bind(this);
}.bind(this), false);
}
}
你可以这样使用它:
// Use class to get element by string.
var swiper = new Swipe('#my-element');
swiper.onLeft(function() { alert('You swiped left.') });
swiper.run();
// Get the element yourself.
var swiper = new Swipe(document.getElementById('#my-element'));
swiper.onLeft(function() { alert('You swiped left.') });
swiper.run();
// One-liner.
(new Swipe('#my-element')).onLeft(function() { alert('You swiped left.') }).run();
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;
}
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