您的位置:首页 > Web前端 > React

Kbone基础——React + Kbone 实现 Todos App

2020-09-02 13:41 495 查看 https://blog.csdn.net/guduzhon

1、搭建React开发环境

在命令行输入以下命令,创建一个 

react-todos
 项目:

[code]// 如果全局没有安装create-react-app, 可以使用npx安装
npx create-react-app react-todos

// 运行项目
cd react-todos
npm start

2、编写React todos代码

2.1 改写index.js

引入组件Todos.js。

[code]// ...

import Todos from './Todos';
// ...

ReactDOM.render(<Todos />, document.getElementById('root'));
// ...

2.2 编写 Todos.css

在项目目录 

react-todos/src
 下创建 
Todos.css

[code]body {
background-color: #222222;
min-height: 100vh;
}

.app {
padding-top: 10rem;
}

.header {
display: flex;
flex-direction: column;
align-items: center;
justify-content: center;
font-size: 50px;
color: yellowgreen;
}

.logo {
animation: App-logo-spin infinite 20s linear;
height: 2vmin;
pointer-events: none;
}

.todo-list {
display: flex;
flex-direction: column;
align-items: center;
justify-content: center;
color: white;
}

.todo {
display: flex;
align-items: center;
margin: 1rem 0;
}

.todo-is-completed .checkbox {
color: #000;
background: #fff;
}

.todo-is-completed input {
text-decoration: line-through;
}

.checkbox {
width: 18px;
height: 18px;
border-radius: 50%;
margin-right: 10px;
cursor: pointer;
font-size: 10px;
display: flex;
justify-content: center;
align-items: center;
transition: background-color .2s ease-in-out;
border: 1px solid #fff;
}

.checkbox:hover {
background: rgba(255, 255, 255, 0.25);
border: 1px solid rgba(255, 255, 255, 0);
}

.checkbox-checked {
color: #000;
background: #fff;
}

ul {
list-style: none;
padding: 0;
line-height: 2rem;
}

input {
border: none;
background: transparent;
color: white;
font-size: 1.4rem;
outline: none;
width: 100%;
}

2.3 编写 Todos.js 组件

在项目目录 

react-todos/src
 下创建 
Todos.js

[code]import React, { useState } from 'react'
import './Todos.css'

function Todos() {
const [todos, setTodos] = useState([
{
content: '干洗衣服',
isCompleted: true,
},
{
content: '理发',
isCompleted: false,
},
{
content: '学习Kbone',
isCompleted: false,
}
])

function handleKeyDown(e, i) {
if (e.key === 'Enter') {
createTodoAtIndex(e, i)
}
if (e.key === 'Backspace' && todos[i].content === '') {
e.preventDefault();
return removeTodoAtIndex(i)
}
}

function createTodoAtIndex(e, i) {
const newTodos = [...todos];
newTodos.splice(i + 1, 0, {
content: '',
isCompleted: false,
})
setTodos(newTodos);
setTimeout(() => {
document.forms[0].elements[i + 1].focus();
}, 0)
}

function updateTodoAtIndex(e, i) {
const newTodos = [...todos]
newTodos[i].content = e.target.value
setTodos(newTodos)
}

function removeTodoAtIndex(i) {
if (i === 0 && todos.length === 1) return
setTodos(todos => todos.slice(0, i).concat(todos.slice(i + 1, todos.length)))
setTimeout(() => {
document.forms[0].elements[i - 1].focus()
}, 0)
}

function toggleTodoCompleteAtIndex(index) {
const temporaryTodos = [...todos]
temporaryTodos[index].isCompleted = !temporaryTodos[index].isCompleted
setTodos(temporaryTodos)
}

return (
<div className="app">
<div className="header">
React Todos
</div>
<form className="todo-list">
<ul>
{todos.map((todo, i) => (
<div key={todo+i} className={`todo ${todo.isCompleted && 'todo-is-completed'}`}>
<div className={'checkbox'} onClick={() => toggleTodoCompleteAtIndex(i)}>
{todo.isCompleted && (
<span>&#x2714;</span>
)}
</div>
<input
type="text"
value={todo.content}
onKeyDown={e => handleKeyDown(e, i)}
onChange={e => updateTodoAtIndex(e, i)}
/>
</div>
))}
</ul>
</form>
</div>
)
}

export default Todos

2.4 项目预览效果

在控制台执行 

npm start
 命令,浏览器效果如下:

3、将 React 项目编入Kbone

3.1 搭建Kbone的React环境

[code]kbone init kbone-react
模板选择 react

cd kbone-react
npm run web
npm run mp

效果如下图:

 

3.2 修改 index.js

修改 

kbone-react/src/index.js

[code]// ...
// import Counter from './components/counter'
import Todos from './components/todos/Todos'

export default function createApp() {
// ...

ReactDOM.render(<Todos />, container)
}

// ...

3.3 创建 Todos.js 组件

在 kbone-react/src/components 下创建 todos文件夹,创建Todos.js,内容如下:

[code]import React, { useState } from 'react'
import './Todos.css'

function Todos() {
const [todos, setTodos] = useState([
{
content: '干洗衣服',
isCompleted: true,
},
{
content: '理发',
isCompleted: false,
},
{
content: '学习Kbone',
isCompleted: false,
}
])

function handleKeyDown(e, i) {
if (e.key === 'Enter') {
createTodoAtIndex(e, i)
}
if (e.key === 'Backspace' && todos[i].content === '') {
e.preventDefault();
return removeTodoAtIndex(i)
}
}

function createTodoAtIndex(e, i) {
const newTodos = [...todos];
newTodos.splice(i + 1, 0, {
content: '',
isCompleted: false,
})
setTodos(newTodos);
setTimeout(() => {
document.forms[0].elements[i + 1].focus();
}, 0)
}

function updateTodoAtIndex(e, i) {
const newTodos = [...todos]
newTodos[i].content = e.target.value
setTodos(newTodos)
}

function removeTodoAtIndex(i) {
if (i === 0 && todos.length === 1) return
setTodos(todos => todos.slice(0, i).concat(todos.slice(i + 1, todos.length)))
setTimeout(() => {
document.forms[0].elements[i - 1].focus()
}, 0)
}

function toggleTodoCompleteAtIndex(index) {
const temporaryTodos = [...todos]
temporaryTodos[index].isCompleted = !temporaryTodos[index].isCompleted
setTodos(temporaryTodos)
}

return (
<div className="app">
<div className="header">
React Todos
</div>
<form className="todo-list">
<ul>
{todos.map((todo, i) => (
<div key={todo+i} className={`todo ${todo.isCompleted && 'todo-is-completed'}`}>
<div className={'checkbox'} onClick={() => toggleTodoCompleteAtIndex(i)}>
{todo.isCompleted && (
<span>&#x2714;</span>
)}
</div>
<input
type="text"
value={todo.content}
onKeyDown={e => handleKeyDown(e, i)}
onChange={e => updateTodoAtIndex(e, i)}
/>
</div>
))}
</ul>
</form>
</div>
)
}

export default Todos

3.4 创建 Todos.css 样式

[code]body {
background-color: #222222;
min-height: 100vh;
}

.app {
padding-top: 10rem;
}

.header {
display: flex;
flex-direction: column;
align-items: center;
justify-content: center;
font-size: 50px;
color: yellowgreen;
}

.logo {
animation: App-logo-spin infinite 20s linear;
height: 2vmin;
pointer-events: none;
}

.todo-list {
display: flex;
flex-direction: column;
align-items: center;
justify-content: center;
color: white;
}

.todo {
display: flex;
align-items: center;
margin: 1rem 0;
}

.todo-is-completed .checkbox {
color: #000;
background: #fff;
}

.todo-is-completed input {
text-decoration: line-through;
}

.checkbox {
width: 18px;
height: 18px;
border-radius: 50%;
margin-right: 10px;
cursor: pointer;
font-size: 10px;
display: flex;
justify-content: center;
align-items: center;
transition: background-color .2s ease-in-out;
border: 1px solid #fff;
}

.checkbox:hover {
background: rgba(255, 255, 255, 0.25);
border: 1px solid rgba(255, 255, 255, 0);
}

.checkbox-checked {
color: #000;
background: #fff;
}

ul {
list-style: none;
padding: 0;
line-height: 2rem;
}

input {
border: none;
background: transparent;
color: white;
font-size: 1.4rem;
outline: none;
width: 100%;
}

3.5 项目预览效果

命令行进入 kbone-react 目录,执行:

[code]npm run web
npm run mp (或者 npm start)

内容来自用户分享和网络整理,不保证内容的准确性,如有侵权内容,可联系管理员处理 点击这里给我发消息
标签: 
相关文章推荐