javascript - How to know element position while it move

There is way to obtain x,y data of a moving element (while it move...), something like:

$(document).mousemove(function (e) {
    var x = e.pageX,
    y = e.pageY;

...
}

but referred to a specific element (i.e. $("#mydiv"))?

Answer

The pageX/pageY variables in the event object refers to the mouse position. If you want to get the position of the element you should do something like this:

$(document).on('mousemove', function(e) {
    var element = $('#myDiv');

    console.log( element.offset() );
    // returns an object with x/y coordinates of the top-left corner of the element
});

Checkout the documentation for .offset() for more info.