React+Redux实现简单的待办事项列表ToDoList

使用Redux做了一个简单的ToDoList待办事项列表,具体如下

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


webpack.config.js配置文件

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;

}

}

}

}

以上是 React+Redux实现简单的待办事项列表ToDoList 的全部内容, 来源链接: utcz.com/z/318318.html

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