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