我使用jQuery。点击来处理Raphael图形上的鼠标点击事件,同时,我需要处理鼠标拖动事件,鼠标拖动在Raphael中由鼠标下拉,鼠标上拉和鼠标移动组成。
很难区分点击和拖动,因为点击也包含鼠标下拉和鼠标上拉,我怎么能区分鼠标“点击”和鼠标“拖动”然后在Javascript?
我使用jQuery。点击来处理Raphael图形上的鼠标点击事件,同时,我需要处理鼠标拖动事件,鼠标拖动在Raphael中由鼠标下拉,鼠标上拉和鼠标移动组成。
很难区分点击和拖动,因为点击也包含鼠标下拉和鼠标上拉,我怎么能区分鼠标“点击”和鼠标“拖动”然后在Javascript?
当前回答
我认为区别在于,在拖拽中,mousedown和mouseup之间有一个鼠标移动,但在点击中没有。
你可以这样做:
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)
其他回答
如果你已经在使用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);
});
});
其实就是这么简单
var dragged = false
window.addEventListener('mousedown', function () { dragged = false })
window.addEventListener('mousemove', function () { dragged = true })
window.addEventListener('mouseup', function() {
if (dragged == true) { return }
console.log("CLICK!! ")
})
老实说,您不希望添加允许小移动的阈值。以上是正确的,正常的,点击所有桌面界面的感觉。
试试吧。
如果愿意,可以轻松添加事件。
如果您希望检查特定元素的单击或拖动行为,则无需监听主体即可执行此操作。
$(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>
对于OSM地图上的公共操作(单击时放置标记),问题是:1)如何确定鼠标向下的持续时间->向上(您无法想象为每次单击创建一个新的标记)2)鼠标向下移动期间->向上(即用户正在拖动地图)。
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);
}
有同样的问题,最近在一个树列表中,用户可以点击项目或拖动它,使这个小指针类,并把它放在我的utils.js
function Pointer(threshold = 10) {
let x = 0;
let y = 0;
return {
start(e) {
x = e.clientX;
y = e.clientY;
},
isClick(e) {
const deltaX = Math.abs(e.clientX - x);
const deltaY = Math.abs(e.clientY - y);
return deltaX < threshold && deltaY < threshold;
}
}
}
下面你可以看到它的工作原理:
function Pointer(threshold = 10) { let x = 0; let y = 0; return { start(e) { x = e.clientX; y = e.clientY; }, isClick(e) { const deltaX = Math.abs(e.clientX - x); const deltaY = Math.abs(e.clientY - y); return deltaX < threshold && deltaY < threshold; } } } const pointer = new Pointer(); window.addEventListener('mousedown', (e) => pointer.start(e)) //window.addEventListener('mousemove', (e) => pointer.last(e)) window.addEventListener('mouseup', (e) => { const operation = pointer.isClick(e) ? "Click" : "Drag" console.log(operation) })