Make modal using createPortal

성능 향상을 위한 포탈 모달창 구현

React
Javascript
Modal

<!-- index.html -->
<div id="backdrop-root"></div>
<div id="overlay-root"></div>
<div id="root"></div>

const Backdrop = (props) => {
  return <div className={classes.backdrop} onClick={props.onConfirm} />;
};

const ModalOverlay = (props) => {
  return (
    <Card className={classes.modal}>
      <header className={classes.header}>
        <h2>{props.title}</h2>
      </header>
      <div className={classes.content}>
        <p>{props.message}</p>
      </div>
      <footer className={classes.actions}>
        <Button onClick={props.onConfirm}>Okay</Button>
      </footer>
    </Card>
  );
};

const ErrorModal = (props) => {
  return (
    <React.Fragment>
      {ReactDOM.createPortal(
        <Backdrop onConfirm={props.onConfirm} />,
        document.getElementById("backdrop-root")
      )}
      {ReactDOM.createPortal(
        <ModalOverlay
          title={props.title}
          message={props.message}
          onConfirm={props.onConfirm}
        />,
        document.getElementById("overlay-root")
      )}
    </React.Fragment>
  );
};

export default ErrorModal;

.backdrop {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100vh;
  z-index: 10;
  background: rgba(0, 0, 0, 0.75);
}

.modal {
  position: fixed;
  top: 30vh;
  left: 10%;
  width: 80%;
  z-index: 100;
  overflow: hidden;
}