JAVASCRIPT

get position of element in react

showBanner(e) {
  const rect = this.btnDownload.current.getBoundingClientRect()

  const isInView = rect.top < window.innerHeight
  const isAtTop = rect.top <= 0

  console.log('Is in view:', isInView)
  console.log('Is at top:', isAtTop)
}

get element position react

function(event){
  var box = //get a handle to box
  box.style.position = 'aboslute';
  box.style.left = event.page.x; 
  box.style.top = event.page.y;
}