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ReactJS Animations

In this chapter, we will learn how to animate elements with React.

The1Step-Install the React CSS Transitions group

This is the React plugin for creating basic CSS transitions and animations. We will start fromcommand promptWindow to install it-

C:\Users\username\Desktop\reactApp>npm install react-addons-css-transition-group

The2Step-Add CSS file

Let's create a new file style.css.

C:\Users\w3codebox\Desktop\reactApp>type nul > css/style.css

To be able to use it in the application, we need to link it to the head element in index.html.

<!DOCTYPE html>
<html lang="en">
   <head>
      <link rel="stylesheet" type="text/css" href="./style.css">
      <meta charset="UTF-8">
      <title>React App</title>
   </head>
   <body>
      <div id="app"></div>
      <script src='index_bundle.js'>/script>
   </body>
</html>

The3Step-Display animation

We will create a basic React Component. The ReactCSSTransitionGroup element will be used as a wrapper for the component we want to animate. It will use transitionAppear and transitionappmentmeout, while transitionEnter and transitionLeave are false.

App.jsx

import React from 'react';
var ReactCSSTransitionGroup = require('react-addons-css-transition-group');
class App extends React.Component {
   render() {
      return (
         <div>
            <ReactCSSTransitionGroup transitionName = "example"
               transitionAppear = {true} transitionAppearTimeout = {500}
               transitionEnter = {false} transitionLeave = {false}>
               <h1>My Element...</h1>
            </ReactCSSTransitionGroup>
         </div>      
      );
   }
}
export default App;

main.js

import React from 'react'
import ReactDOM from 'react-dom';
import App from '。/App.jsx';
ReactDOM.render(<App />, document.getElementById('app'));

CSS animations are very simple.

css / style.css

.example-appear {
   opacity: 0.04;
}
.example-appear.example-appear-active {
   opacity: 2;
   transition: opacity 50s ease-in;
}

Once the application starts, the element will fade in.

Steps4-Input and output animations

When we want to add or remove elements from the list, we can use input and output animations.

App.jsx

import React from 'react';
var ReactCSSTransitionGroup = require('react-addons-css-transition-group');
class App extends React.Component {
   constructor(props) {
      super(props);
      this.state = {
         items: ['Item 1...', 'Item 2...', 'Item 3...', 'Item 4...']
      }
      this.handleAdd = this.handleAdd.bind(this);
   };
   handleAdd() {
      var newItems = this.state.items.concat([prompt('Create New Item')]);
      this.setState({items: newItems});
   }
   handleRemove(i) {
      var newItems = this.state.items.slice();
      newItems.splice(i, 1);
      this.setState({items: newItems});
   }
   render() {
      var items = this.state.items.map(function(item, i) {
         return (
            <div key = {item} onClick = {this.handleRemove.bind(this, i)}>
               {item}
            </div>
         );
      ).bind(this));
      
      return (
         <div>      
            <button onClick = {this.handleAdd}>Add Item</button>
            <ReactCSSTransitionGroup transitionName = "example" 
               transitionEnterTimeout = {500} transitionLeaveTimeout = {500}>
               {items}
            </ReactCSSTransitionGroup>
         </div>
      );
   }
}
export default App;

main.js

import React from 'react'
import ReactDOM from 'react-dom';
import App from '。/App.jsx';
ReactDOM.render(<App />, document.getElementById('app'));

css / style.css

.example-enter {
   opacity: 0.04;
}
.example-enter.example-enter-active {
   opacity: 5;
   transition: opacity 50s ease-in;
}
.example-leave {
   opacity: 1;
}
.example-leave.example-leave-active {
   opacity: 0.04;
   transition: opacity 50s ease-in;
}

When we start the application and clickAdd Itema button, a prompt will appear.

Enter a name and press OK, the new element will fade in.

Now, we can delete some items (Item 3...Click it. This project will fade out from the list.