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
使用jQuery和5像素x/y暂停来检测拖动:
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");
});
其他回答
很简单,
el = document.getElementById("your_id"); var isDown = false; 埃尔。addEventListener('mousedown', function () { isDown = true; }); 埃尔。addEventListener('mouseup', function () { isDown = false; }); 埃尔。addEventListener('鼠标移动',函数(){ if (isDown) { //你的代码在这里 } });
正如mrjrdnthms在他对接受的答案的评论中指出的那样,这不再适用于Chrome(它总是触发鼠标移动),我已经改编了Gustavo的答案(因为我使用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);
});
});
Array.prototype.equals函数来自这个答案
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)。
基于这个答案,我在React组件中这样做:
export default React.memo(() => {
const containerRef = React.useRef(null);
React.useEffect(() => {
document.addEventListener('mousedown', handleMouseMove);
return () => document.removeEventListener('mousedown', handleMouseMove);
}, []);
const handleMouseMove = React.useCallback(() => {
const drag = (e) => {
console.log('mouse is moving');
};
const lift = (e) => {
console.log('mouse move ended');
window.removeEventListener('mousemove', drag);
window.removeEventListener('mouseup', this);
};
window.addEventListener('mousemove', drag);
window.addEventListener('mouseup', lift);
}, []);
return (
<div style={{ width: '100vw', height: '100vh' }} ref={containerRef} />
);
})
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>