ReactJS - Animations

ReactJS - 动画

在本教程中我们将学习如何用 React 来制作淡入(fade in)淡出(fade out)动画( Animations )。

首先,先安装 React CSS Transitions Group 组件

npm install react-addons-css-transition-group

因为我们的淡入淡出动画使用的是 CSS transitions and animations

其次,添加应用的样式表文件

先创建一个 css目录,再添加 style.css 文件,完成后目录结构如下

|--css
| |-- style.css

接着,把创建好的 style.css 链接到 index.html

<link rel = "stylesheet" href = "css/style.css">

再次,给加载列表添加淡入进场动画

  1. 新建一个 ReactCSSTransitionGroup 组件用来包裹需要动画的 html元素
  2. 然后设置 transitionAppear,transitionAppearTimeout ,transitionEnter,transitionLeave 属性.

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;

创建 main.js

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

使用 CSS animation 非常简单

完善样式 css/style.css

.example-appear {
opacity: 0.01;
}
.example-appear.example-appear-active {
opacity: 1;
transition: opacity 500ms ease-in;
}

运行我们的应用,我们的元素就会有 淡入 动画
React Animations 淡入

最后,完善进场动画和退场动画

接下来我们给新增操作添加进场动画,删除操作添加退场动画

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: 0.01;
}
.example-enter.example-enter-active {
opacity: 1;
transition: opacity 500ms ease-in;
}
.example-leave {
opacity: 1;
}
.example-leave.example-leave-active {
opacity: 0.01;
transition: opacity 500ms ease-in;
}

运行我们的应用并单击 添加 按钮,你就能看到我们的进场和退场动画

React 动画-添加元素
输入名字,然后单击 添加按钮, 我们添加的 新公司 就会淡入.
React 进场动画

现在我们来删除 Item 3…Item 3 这个元素就会淡出

React 退场退场