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

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)。

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 } });

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} />
    );
})

如果只是为了过滤掉拖动的情况,这样做:

var moved = false;
$(selector)
  .mousedown(function() {moved = false;})
  .mousemove(function() {moved = true;})
  .mouseup(function(event) {
    if (!moved) {
        // clicked without moving mouse
    }
  });

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>

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);
  });
});