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
所有这些解决方案要么在微小的鼠标移动上失效，要么过于复杂。
下面是一个使用两个事件侦听器的简单适应性解决方案。Delta是您必须在上下事件之间水平或垂直移动的距离(以像素为单位)，以便代码将其归类为拖拽而不是单击。这是因为有时你会在抬起鼠标或手指之前移动几个像素点。
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!
}
});
其他回答
你可以这样做:
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>
另一个基于类的香草JS使用距离阈值的解决方案
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
}
});
}
在类内部添加(SOMESLIDER_ELEMENT也可以是document为global):
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);
}
所有这些解决方案要么在微小的鼠标移动上失效，要么过于复杂。
下面是一个使用两个事件侦听器的简单适应性解决方案。Delta是您必须在上下事件之间水平或垂直移动的距离(以像素为单位)，以便代码将其归类为拖拽而不是单击。这是因为有时你会在抬起鼠标或手指之前移动几个像素点。
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!
}
});
这应该能很好地工作。类似于已接受的答案(虽然使用jQuery)，但只有当新的鼠标位置与mousedown事件上的位置不同时，isdrag标志才会重置。与公认的答案不同，这适用于最新版本的Chrome，无论鼠标是否移动，鼠标移动都会被触发。
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 = [];
});
你也可以在鼠标移动中调整坐标检查，如果你想增加一点公差(即将微小的移动视为点击，而不是拖动)。
下面的编码是检测鼠标的移动。
它适用于大多数情况。这也取决于 关于如何将mouseevent处理为单击。 在JavaScript中，检测非常简单。它不关心如何 在鼠标下拉和鼠标上拉之间按住或移动。 Event.detail不会重置为1当你的鼠标移动 鼠标下拉和鼠标上拉。 如果你需要区分点击和长按，你需要 检查事件的差异。时间戳。
// ==== add the code at the begining of your coding ==== let clickStatus = 0; (() => { let screenX, screenY; document.addEventListener('mousedown', (event) => ({screenX, screenY} = event), true); document.addEventListener('mouseup', (event) => (clickStatus = Math.abs(event.screenX - screenX) + Math.abs(event.screenY - screenY) < 3), true); })(); // ==== add the code at the begining of your coding ==== $("#draggable").click(function(event) { if (clickStatus) { console.log(`click event is valid, click count: ${event.detail}`) } else { console.log(`click event is invalid`) } }) <!doctype html> <html lang="en"> <!-- coding example from https://jqueryui.com/draggable/ --> <head> <meta charset="utf-8"> <meta name="viewport" content="width=device-width, initial-scale=1"> <title>jQuery UI Draggable - Default functionality</title> <link rel="stylesheet" href="//code.jquery.com/ui/1.12.1/themes/base/jquery-ui.css"> <link rel="stylesheet" href="/resources/demos/style.css"> <style> #draggable { width: 150px; height: 150px; padding: 0.5em; } </style> <script src="https://code.jquery.com/jquery-1.12.4.js"></script> <script src="https://code.jquery.com/ui/1.12.1/jquery-ui.js"></script> <script> $( function() { $( "#draggable" ).draggable(); } ); </script> </head> <body> <div id="draggable" class="ui-widget-content"> <p>Drag me around</p> </div> </body> </html>
