React's mouseEvent doesn't have offsetX/offsetY

Question

I try get position of click relative to element, but event doesn't have offsetX.

onClick(e) {
  console.log(e.offsetX) // returns undefined
  console.log(e.target.offsetX) // returns undefined
}

render() {
  return <img src='http://placehold.it/1000x500' onClick={this.onClick} />
}

How I can get position of click in element?

Answer 1

Oh, well, I see. I get it from e.nativeEvent.offsetX. Is it right approach?

Answer 2

I have found that evt.nativeEvent.offsetX was causing me problems with my component flashing a lot and being sort of weird, I haven't fully debugged it, but I switched to using

React.createRef or React.useRef on the parent container, and then using event.clientX - ref.current.getBoundingClientRect().left and found this works better for me