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Draggable event listeners, single element

A Pen By Dave DeSandro Pro

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HTML

            
              <div class="draggable"></div>
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CSS

            
              .draggable {
  display: inline-block;
  position: relative;
  width: 150px;
  height: 150px;
  background: #19F;
  border-radius: 8px;
  cursor: move;
}
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JS

            
              var dragElem = document.querySelector('.draggable');

var x = 0;
var y = 0;
var dragStartX, dragStartY, pointerDownX, pointerDownY;

dragElem.addEventListener( 'mousedown', function( event ) {
  // keep track of start positions
  dragStartX = x;
  dragStartY = y;
  pointerDownX = event.pageX;
  pointerDownY = event.pageY;
  // add move & up events
  window.addEventListener( 'mousemove', onmousemove );
  window.addEventListener( 'mouseup', onmouseup );
});

function onmousemove( event ) {
  // how much has moved
  var moveX = event.pageX - pointerDownX;
  var moveY = event.pageY - pointerDownY;
  // add movement to position
  x = dragStartX + moveX;
  y = dragStartY + moveY;
  // position element
  dragElem.style.left = x + 'px';
  dragElem.style.top = y + 'px';
}

function onmouseup() {
  // remove move & up events
  window.removeEventListener( 'mousemove', onmousemove );
  window.removeEventListener( 'mouseup', onmouseup );
}
!
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