第1步-安装React CSS Transitions组
这是React插件，用于创建基本的CSS过渡和动画。我们将从command prompt窗口安装它-
C:\Users\username\Desktop\reactApp>npm install react-addons-css-transition-group第2步-添加CSS文件
让我们创建一个新文件style.css。
C:\Users\sfjvip\Desktop\reactApp>type nul > css/style.css为了能够在应用程序中使用它，我们需要将其链接到index.html中的head元素。
<!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>第3步-显示动画
我们将创建一个基本的 React 组件。Reactcsstransitionggroup 元素将用作我们想要动画化的组件的包装器。它将使用 transitionAppear 和 transitionappmentmeout，而 transitionEnter 和 transitionLeave 为 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动画非常简单。
css / style.css
.example-appear {
opacity: 0.04;
}
.example-appear.example-appear-active {
opacity: 2;
transition: opacity 50s ease-in;
}一旦启动应用程序，该元素就会淡入。
步骤4-输入及输出动画
当我们想从列表中添加或删除元素时，可以使用输入及输出动画。
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;
}当我们启动应用程序并单击Add Item按钮时，将出现提示。
输入名称并按OK后，新元素就会淡入。
现在，我们可以删除一些项目(Item 3...)点击它。该项目将从列表中淡出。
