使用Redux做了一个简单的TodoList待办事项列表
这个例子也是源于Redux作者Dan Abramov的视频demo
还要特别说明一下
我还没有使用react-redux库进行解耦（可能以后加）
也没有拆分成多个文件等等优化
为了单纯的练习redux
适合初步学习redux的同学
本人学疏才浅，发现可以优化的地方或者问题还请大家指正，谢谢
功能样式
样子就是这样的
在输入框输入待办事项
功能很简单
鼠标点击Add或者键盘按下Enter输出
ShowAll显示全部待办事项
ShowActive显示未完成的待办事项（未划掉的）
ShowCrossed显示已完成的待办事项（划掉的）
配置文件
使用Webpack构建的文件夹如下
module.exports = {
entry: {
index: './src/js/entry.js'
},output: {
path: './static/dist/',publicPath: 'http://localhost:8080/static/dist/',filename: '[name].js'
},module: {
loaders: [
{
test: /\.js$/,loader: 'babel',exclude:/node_modules/,query: {
presets: ['react','es2015']
}
},{
test: /.less$/,loader: 'style!css!less'
}
]
}
}
package.json的依赖项
{
"name": "react-demo","version": "1.0.0","description": "","main": "webpack.config.js","scripts": { "test": "echo \"Error: no test specified\" && exit 1","diy": "webpack-dev-server --progress --colors --devtool sourcemap" },"author": "Payson","license": "ISC","devDependencies": { "babel-core": "^6.22.1","babel-loader": "^6.2.10","babel-preset-es2015": "^6.22.0","babel-preset-react": "^6.22.0","css-loader": "^0.26.1","jquery": "^3.1.1","less": "^2.7.2","less-loader": "^2.2.3","react": "^15.4.2","react-dom": "^15.4.2","react-redux": "^5.0.2","redux": "^3.6.0","style-loader": "^0.13.1","webpack": "^1.14.0","webpack-dev-server": "^1.16.2" } }
html文件
<!DOCTYPE html>
<html lang="en">
<head>
<Meta charset="UTF-8">
<title>React</title>
</head>
<body>
<div id="root"></div>
<script src="http://localhost:8080/static/dist/index.js"></script>
</body>
</html>
脚本文件
没有细拆文件
直接写在入口文件entry.js了
注释就写在代码里了
require('../less/index.less'); //行间样式受限制不能添加伪类伪元素，所以还是添加了less(css)控制样式
import React from 'react';
import {Component} from 'react'
import ReactDom from 'react-dom';
import {createStore,combineReducers} from 'redux';
class TodoList extends Component {
addHandler(){ //添加待办事项的listener
let Inp = this.refs.Inp; //获取真实DOM的输入value
if(!Inp.value){ //如果没有输入值，直接返回
return;
}
store.dispatch( //dispatch一个添加项目的action，并传入输入数据
{
type: 'ADD_ITEM',newItem: Inp.value
}
)
Inp.value = ''; //提交后，清空输入
Inp.focus(); //重置输入焦点
}
toggleHandler(item){ //Action Creator：负责提交切换中划线的action
store.dispatch(
{
type: 'TOGGLE_ITEM',changeID: item.ID
}
);
}
showAllHandler(){ //Action Creator：负责showAll的action
store.dispatch(
{
type: 'SET_FILTER',filter: 'SHOW_ALL'
}
);
}
showActiveHandler(){ //Action Creator：负责showActive的action
store.dispatch(
{
type: 'SET_FILTER',filter: 'SHOW_ACTIVE'
}
);
}
showCrossedHandler(){ //Action Creator：负责showCrossed的action
store.dispatch(
{
type: 'SET_FILTER',filter: 'SHOW_CROSSED'
}
);
}
render(){ //渲染结构样式
let _this = this; //缓存this
let state = store.getState(); //缓存store的快照--state
let {list,option} = state; //解构赋值获取两个子state
//list是一个数组，内部数组元素是对象表示每一个列表项
//option是一个字符串，表示当先选择的选项
switch(option){ //通过判断当前的option字符串来决定是否过滤list数组
case 'SHOW_ACTIVE':
list = list.filter(function(item){
return !item.del;
});
break;
case 'SHOW_CROSSED':
list = list.filter(function(item){
return item.del;
});
break;
}
document.body.addEventListener('keydown',function(e){
if(e.which == 13){
_this.addHandler();
}
}); //绑定键盘enter事件
return (
<div>
<input type="text" ref="Inp"/> //设置ref属性为了获取真实DOM节点
<button onClick={_this.addHandler.bind(_this)}>Add</button>
<ul className="option">
<li onClick={_this.showAllHandler.bind(_this)}>
<span style={{textdecoration: option!='SHOW_ALL' ? 'underline' : 'none'}}>ShowAll</span>
</li>
<li onClick={_this.showActiveHandler.bind(_this)}>
<span style={{textdecoration: option!='SHOW_ACTIVE' ? 'underline' : 'none'}}>ShowActive</span>
</li>
<li onClick={_this.showCrossedHandler.bind(_this)}>
<span style={{textdecoration: option!='SHOW_CROSSED' ? 'underline' : 'none'}}>ShowCrossed</span>
</li> //判断option字符串来决定三个选项的样式
</ul>
<ul className="list">
{
list.map(function(item,index){ //通过list数组map映射为虚拟DOM节点
return <li key={index}>
<span style={{textdecoration: item.del ? 'line-through': 'none'}}
onClick={_this.toggleHandler.bind(_this,item)}>{item.item}</span>
</li>
})
}
</ul>
</div>
)
}
}
const list = (state = [],action) => { //list-reducer
switch(action.type){
case 'ADD_ITEM':
return [
...state,{
item: action.newItem,//列表项内容
ID: state.length,//列表项ID
del: false //列表项是否已划掉
}
];
case 'TOGGLE_ITEM':
return state.map((item)=>{
return Object.assign({},item,{
del: action.changeID == item.ID ? !item.del : item.del
});
});
default:
return state;
}
}
const option = (state = 'SHOW_ALL',action) => { //option-reducer
switch(action.type){
case 'SET_FILTER':
return action.filter;
default:
return state;
}
}
const reducer = combineReducers({list,option}); //利用redux库API-combineReducers()合并reducer
const store = createStore(reducer); //利用redux库API-createStore()创建store
const render = () => { //自定义的渲染函数
ReactDom.render(
<TodoList/>,document.getElementById('root')
);
}
store.subscribe(render); //绑定render函数，每次state更新时执行
render(); //首次渲染
样式文件
index.less文件加一些样式控制
.option {
list-style-type: none;
padding: 0;
margin-top: 5px;
font-size: 13px;
li {
float: left;
margin-right: 15px;
span {
cursor: pointer;
font-weight: bold;
}
}
&::after {
content: '';
display: block;
clear: both;
}
}
.list {
li {
span {
&:hover {
color: #f40;
cursor: pointer;
}
&::selection {
color: #000;
background-color: #fff;
}
}
}
}
