React - animate mount and unmount of a single component

Question

Something this simple should be easily accomplished, yet I\'m pulling my hair out over how complicated it is.

All I want to do is animate the mounting & unmounti

Answer 1

I think using Transition from react-transition-group is probably the easiest way to track mounting/unmounting. It is incredibly flexible. I'm using some classes to show how easy it is to use but you can definitely hook up your own JS animations utilizing addEndListener prop - which I've had a lot of luck using GSAP with as well.

Sandbox: https://codesandbox.io/s/k9xl9mkx2o

And here's my code.

import React, { useState } from "react";
import ReactDOM from "react-dom";
import { Transition } from "react-transition-group";
import styled from "styled-components";

const H1 = styled.h1`
  transition: 0.2s;
  /* Hidden init state */
  opacity: 0;
  transform: translateY(-10px);
  &.enter,
  &.entered {
    /* Animate in state */
    opacity: 1;
    transform: translateY(0px);
  }
  &.exit,
  &.exited {
    /* Animate out state */
    opacity: 0;
    transform: translateY(-10px);
  }
`;

const App = () => {
  const [show, changeShow] = useState(false);
  const onClick = () => {
    changeShow(prev => {
      return !prev;
    });
  };
  return (
    

      {show ? "Hide" : "Show"}
      
        {state => {
          let className = state;
          return 
Animate me
;
        }}
      
    
  );
};

const rootElement = document.getElementById("root");
ReactDOM.render(, rootElement);