将 div 旋转到鼠标位置

Question

I want to let a div rotate to the point where the mouse will be,

So when my mouse is left it have to show <- when my mouse is to the right it have to show ->

This needs to be in any direction!

Does anyone have a solution?

EDIT:

<style>
    body {
        height: 100vh;
        display: flex;
        align-items: center;
        justify-content: center;
        overflow: hidden;
    }
</style>

<div id="arrow">&gt;</div>

<script type="text/javascript">
    var arrow = document.querySelector("#arrow");
    var arrowRects = arrow.getBoundingClientRect();
    var arrowX = arrowRects.left + arrowRects.width / 2;
    var arrowY = arrowRects.top + arrowRects.height / 2;

    addEventListener("mousemove", function(event) {
        arrow.style.transform = "rotate(" + Math.atan2(event.y - arrowY, event.x - arrowX) + "rad)";
    });
</script>

Answer 1

You can listen for mousemove events to get the position of the cursor. Then, use a rotation transform to make the arrow rotate.

 function getCenter(element) { const {left, top, width, height} = element.getBoundingClientRect(); return {x: left + width / 2, y: top + height / 2} } const arrow = document.querySelector("#arrow"); const arrowCenter = getCenter(arrow); addEventListener("mousemove", ({clientX, clientY}) => { const angle = Math.atan2(clientY - arrowCenter.y, clientX - arrowCenter.x); arrow.style.transform = `rotate(${angle}rad)`; });

 html { height: 100vh; display: flex; align-items: center; justify-content: center; }

 <div id="arrow">&gt;</div>

Answer 2

A jQuery version of metarmask's answer.

 var arrow = $('#arrow'); var arrowX = arrow.offset().left + arrow.outerWidth(true) / 2; var arrowY = arrow.offset().top + arrow.outerHeight(true) / 2; $(document).on('mousemove', function(event) { var rad = Math.atan2(event.pageY - arrowY, event.pageX - arrowX); arrow.css('transform', 'rotate('+rad+ 'rad)'); });

 body { height: 100vh; display: flex; align-items: center; justify-content: center; overflow: hidden; }

 <script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script> <div id="arrow">&gt;</div>