我使用的jQuery.click
处理上拉斐尔图形的鼠标点击事件,同时,我需要处理鼠标drag
事件,鼠标拖动由mousedown
,mouseup
并mousemove
在拉斐尔。
很难区分click
并且drag
因为click
还包含mousedown
&mouseup
,然后如何在Javascript中区分鼠标“ click”和鼠标“ drag”?
我觉得不同的是,有一mousemove
间mousedown
,并mouseup
在一拖,而不是在一个点击。
您可以执行以下操作:
const element = document.createElement('div')
element.innerHTML = 'test'
document.body.appendChild(element)
let moved
let downListener = () => {
moved = false
}
element.addEventListener('mousedown', downListener)
let moveListener = () => {
moved = true
}
element.addEventListener('mousemove', moveListener)
let upListener = () => {
if (moved) {
console.log('moved')
} else {
console.log('not moved')
}
}
element.addEventListener('mouseup', upListener)
// release memory
element.removeEventListener('mousedown', downListener)
element.removeEventListener('mousemove', moveListener)
element.removeEventListener('mouseup', upListener)
如果您已经在使用jQuery:
var $body = $('body');
$body.on('mousedown', function (evt) {
$body.on('mouseup mousemove', function handler(evt) {
if (evt.type === 'mouseup') {
// click
} else {
// drag
}
$body.off('mouseup mousemove', handler);
});
});
清洁剂ES2015
let drag = false;
document.addEventListener('mousedown', () => drag = false);
document.addEventListener('mousemove', () => drag = true);
document.addEventListener('mouseup', () => console.log(drag ? 'drag' : 'click'));
正如其他人所说,没有遇到任何错误。
这应该运作良好。与接受的答案类似(尽管使用jQuery),但是isDragging
仅当新鼠标位置与mousedown
事件上的鼠标位置不同时,才重置标志。与公认的答案不同,该答案适用于最新版本的Chrome,mousemove
无论是否移动鼠标,都会在最新版本的Chrome上触发该答案。
var isDragging = false;
var startingPos = [];
$(".selector")
.mousedown(function (evt) {
isDragging = false;
startingPos = [evt.pageX, evt.pageY];
})
.mousemove(function (evt) {
if (!(evt.pageX === startingPos[0] && evt.pageY === startingPos[1])) {
isDragging = true;
}
})
.mouseup(function () {
if (isDragging) {
console.log("Drag");
} else {
console.log("Click");
}
isDragging = false;
startingPos = [];
});
mousemove
如果您想增加一点公差(例如,将微小的移动视为点击而不是拖动),则也可以调整坐标检查。
如果您想使用Rxjs:
var element = document;
Rx.Observable
.merge(
Rx.Observable.fromEvent(element, 'mousedown').mapTo(0),
Rx.Observable.fromEvent(element, 'mousemove').mapTo(1)
)
.sample(Rx.Observable.fromEvent(element, 'mouseup'))
.subscribe(flag => {
console.clear();
console.log(flag ? "drag" : "click");
});
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<script src="https://unpkg.com/@reactivex/rxjs@5.4.1/dist/global/Rx.js"></script>
这是@ wong2在他的回答中所做的直接克隆,但转换为RxJs。
也很有趣sample
。所述sample
操作者将采取的最新值从源(merge
的mousedown
和mousemove
),并发射它的内观察到的(当mouseup
)发射。
所有这些解决方案要么只依靠微小的鼠标移动就中断,要么过于复杂。
这是使用两个事件侦听器的简单可调整解决方案。Delta是您必须在上下事件之间在水平或垂直方向上移动的距离(以像素为单位),以便代码将其分类为拖动而不是单击。这是因为有时您在抬起鼠标或手指之前会将其移动几个像素。
const delta = 6;
let startX;
let startY;
element.addEventListener('mousedown', function (event) {
startX = event.pageX;
startY = event.pageY;
});
element.addEventListener('mouseup', function (event) {
const diffX = Math.abs(event.pageX - startX);
const diffY = Math.abs(event.pageY - startY);
if (diffX < delta && diffY < delta) {
// Click!
}
});
正如mrjrdnthms在他对已接受答案的评论中所指出的那样,这不再适用于Chrome(它始终会触发鼠标移动),我已经修改了Gustavo的答案(因为我使用的是jQuery)来解决Chrome的行为。
var currentPos = [];
$(document).on('mousedown', function (evt) {
currentPos = [evt.pageX, evt.pageY]
$(document).on('mousemove', function handler(evt) {
currentPos=[evt.pageX, evt.pageY];
$(document).off('mousemove', handler);
});
$(document).on('mouseup', function handler(evt) {
if([evt.pageX, evt.pageY].equals(currentPos))
console.log("Click")
else
console.log("Drag")
$(document).off('mouseup', handler);
});
});
该Array.prototype.equals
功能来源于此答案
使用具有5个像素x / y阈值的jQuery来检测拖动:
var dragging = false;
$("body").on("mousedown", function(e) {
var x = e.screenX;
var y = e.screenY;
dragging = false;
$("body").on("mousemove", function(e) {
if (Math.abs(x - e.screenX) > 5 || Math.abs(y - e.screenY) > 5) {
dragging = true;
}
});
});
$("body").on("mouseup", function(e) {
$("body").off("mousemove");
console.log(dragging ? "drag" : "click");
});
如果只是为了过滤拖曳情况,请按照以下步骤操作:
var moved = false;
$(selector)
.mousedown(function() {moved = false;})
.mousemove(function() {moved = true;})
.mouseup(function(event) {
if (!moved) {
// clicked without moving mouse
}
});
您可以这样做:
var div = document.getElementById("div");
div.addEventListener("mousedown", function() {
window.addEventListener("mousemove", drag);
window.addEventListener("mouseup", lift);
var didDrag = false;
function drag() {
//when the person drags their mouse while holding the mouse button down
didDrag = true;
div.innerHTML = "drag"
}
function lift() {
//when the person lifts mouse
if (!didDrag) {
//if the person didn't drag
div.innerHTML = "click";
} else div.innerHTML = "drag";
//delete event listeners so that it doesn't keep saying drag
window.removeEventListener("mousemove", drag)
window.removeEventListener("mouseup", this)
}
})
body {
outline: none;
box-sizing: border-box;
margin: 0;
padding: 0;
font-family: Arial, Helvetica, sans-serif;
overflow: hidden;
}
#div {
/* calculating -5px for each side of border in case border-box doesn't work */
width: calc(100vw - 10px);
height: calc(100vh - 10px);
border: 5px solid orange;
background-color: yellow;
font-weight: 700;
display: grid;
place-items: center;
user-select: none;
cursor: pointer;
padding: 0;
margin: 0;
}
<html>
<body>
<div id="div">Click me or drag me.</div>
</body>
</html>
带有DeltaX和DeltaY的纯JS
如已接受答案中的注释所建议的,此DeltaX和DeltaY避免了尝试单击和进行拖动操作(由于一次单击鼠标移动)而令人沮丧的体验。
deltaX = deltaY = 2;//px
var element = document.getElementById('divID');
element.addEventListener("mousedown", function(e){
if (typeof InitPageX == 'undefined' && typeof InitPageY == 'undefined') {
InitPageX = e.pageX;
InitPageY = e.pageY;
}
}, false);
element.addEventListener("mousemove", function(e){
if (typeof InitPageX !== 'undefined' && typeof InitPageY !== 'undefined') {
diffX = e.pageX - InitPageX;
diffY = e.pageY - InitPageY;
if ( (diffX > deltaX) || (diffX < -deltaX)
||
(diffY > deltaY) || (diffY < -deltaY)
) {
console.log("dragging");//dragging event or function goes here.
}
else {
console.log("click");//click event or moving back in delta goes here.
}
}
}, false);
element.addEventListener("mouseup", function(){
delete InitPageX;
delete InitPageY;
}, false);
element.addEventListener("click", function(){
console.log("click");
}, false);
对于在OSM地图上的公共行动(单击时放置标记),问题是:1)如何确定鼠标从下到上的持续时间(您无法想象为每次单击创建新标记),以及2)鼠标在下->上移动(即用户拖动地图)。
const map = document.getElementById('map');
map.addEventListener("mousedown", position);
map.addEventListener("mouseup", calculate);
let posX, posY, endX, endY, t1, t2, action;
function position(e) {
posX = e.clientX;
posY = e.clientY;
t1 = Date.now();
}
function calculate(e) {
endX = e.clientX;
endY = e.clientY;
t2 = (Date.now()-t1)/1000;
action = 'inactive';
if( t2 > 0.5 && t2 < 1.5) { // Fixing duration of mouse down->up
if( Math.abs( posX-endX ) < 5 && Math.abs( posY-endY ) < 5 ) { // 5px error on mouse pos while clicking
action = 'active';
// --------> Do something
}
}
console.log('Down = '+posX + ', ' + posY+'\nUp = '+endX + ', ' + endY+ '\nAction = '+ action);
}
使用距离阈值的基于类的香草JS的另一种解决方案
private initDetectDrag(element) {
let clickOrigin = { x: 0, y: 0 };
const dragDistanceThreshhold = 20;
element.addEventListener('mousedown', (event) => {
this.isDragged = false
clickOrigin = { x: event.clientX, y: event.clientY };
});
element.addEventListener('mousemove', (event) => {
if (Math.sqrt(Math.pow(clickOrigin.y - event.clientY, 2) + Math.pow(clickOrigin.x - event.clientX, 2)) > dragDistanceThreshhold) {
this.isDragged = true
}
});
}
在类中添加(SOMESLIDER_ELEMENT也可以是全局文件):
private isDragged: boolean;
constructor() {
this.initDetectDrag(SOMESLIDER_ELEMENT);
this.doSomeSlideStuff(SOMESLIDER_ELEMENT);
element.addEventListener('click', (event) => {
if (!this.sliderIsDragged) {
console.log('was clicked');
} else {
console.log('was dragged, ignore click or handle this');
}
}, false);
}
如果要检查特定元素的单击或拖动行为,则可以执行此操作,而不必收听主体。
$(document).ready(function(){
let click;
$('.owl-carousel').owlCarousel({
items: 1
});
// prevent clicks when sliding
$('.btn')
.on('mousemove', function(){
click = false;
})
.on('mousedown', function(){
click = true;
});
// change mouseup listener to '.content' to listen to a wider area. (mouse drag release could happen out of the '.btn' which we have not listent to). Note that the click will trigger if '.btn' mousedown event is triggered above
$('.btn').on('mouseup', function(){
if(click){
$('.result').text('clicked');
} else {
$('.result').text('dragged');
}
});
});
.content{
position: relative;
width: 500px;
height: 400px;
background: #f2f2f2;
}
.slider, .result{
position: relative;
width: 400px;
}
.slider{
height: 200px;
margin: 0 auto;
top: 30px;
}
.btn{
display: flex;
align-items: center;
justify-content: center;
text-align: center;
height: 100px;
background: #c66;
}
.result{
height: 30px;
top: 10px;
text-align: center;
}
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/OwlCarousel2/2.3.4/owl.carousel.min.js"></script>
<link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/OwlCarousel2/2.3.4/assets/owl.carousel.min.css" />
<div class="content">
<div class="slider">
<div class="owl-carousel owl-theme">
<div class="item">
<a href="#" class="btn" draggable="true">click me without moving the mouse</a>
</div>
<div class="item">
<a href="#" class="btn" draggable="true">click me without moving the mouse</a>
</div>
</div>
<div class="result"></div>
</div>
</div>
来自@Przemek的答案,
function listenClickOnly(element, callback, threshold=10) {
let drag = 0;
element.addEventListener('mousedown', () => drag = 0);
element.addEventListener('mousemove', () => drag++);
element.addEventListener('mouseup', e => {
if (drag<threshold) callback(e);
});
}
listenClickOnly(
document,
() => console.log('click'),
10
);
文章标签:dom-events , javascript
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