Detailed explanation of the steps for component development in React
This time I will bring you a detailed explanation of the steps for component development with React. What are the precautions for component development with React? The following is a practical case. Let’s take a look. .
Goal
Understand several reference points for component design:
Component unpacking principles
Component Inter-communication
Two-way binding
1. Component design
1.1 By presence or absenceState management
Can be divided into Stateful components
Stateless components
Illustration
1.1.1 Stateful Component, created in the form of React.Component
is used to manage application data. For example, in business, the data required for the homepage is:
Recommended categories
Recommended ads
Recommended products
Code example
class MyComponent extends Component { constructor(props) { super(props) this.state = { 推荐分类列表:[], 推荐广告列表:[], 推荐商品列表:[] } } render() { return ...首页> } }
1.1.2 Stateless components are mostly displayed in the form of functions. Try to use this form during development
This kind of component does not maintain state by itself, and data is transferred by attributes. Enter
Code sample
function Element(props) { let val = props.val return <p>组件 - ...</p> }
1.2 Divide components into container components
function##operation components
display components
Illustration
##1.2.1 Container component
attributes
, and then the subcomponent returns the data usingevent
- Status includes: search keywords, sorting, product list
- Sub-components include: search bar, list control bar , product list
- Code example
class Container extends Component { constructor(props) { super(props) this.state = { 搜索关键字: '手机壳', 排序: '综合', 商品列表: [] } } render() { return ( <p> </p> ) } }
user Register
Login, shopping cart, article editing, taking pictures, uploadingSearch box in the diagram, receiving attributes
keywords generated new data
Event Method to return container component
Code example
function SearchInput(props) { let 关键字 = props.关键字 return ( <p> <input> </p> ) }
properties
Data, used to display the product list in the diagram, receiving
attributes
Product listCode example
function SearchInput(props) { let 商品列表 = props.商品列表 return ( <p> {商品列表.map((item, index) => ( ))} </p> ) }
Product information
The component is also adisplay componentis actually in a container component On the top, a, split the component as much as possible
2. Communication between components
control component
and adisplay componentillustration
we start writing Let’s take a look
function InputView(props) {
return (
<p>
<input>
</p>
)
}
Copy after login
Process thefunction InputView(props) { return ( <p> <input> </p> ) }
onKeyDown
message and return it to the parent containerSecond Step: Write the list display component
function ListView(props) {
return (
<ol>
{props.datas &&
props.datas.map((item, index) => (
<li>{item}</li>
))}
</ol>
)
}
Copy after login
function ListView(props) { return ( <ol> {props.datas && props.datas.map((item, index) => ( <li>{item}</li> ))} </ol> ) }
map
Print the data list in a loopThe third step: Container component binding status and events
class ContainerView extends Component {
constructor(props) {
super(props)
this.state = {list: []}
this.handleChange = this.handleChange.bind(this)
}
handleChange(e) {
if (e.keyCode === 13) {
const value = e.target.value
e.target.value = ''
this.setState((state, props) => {
let list = state.list
list.push(value)
return {list}
})
}
}
render() {
return (
<p>
<inputview></inputview>
<listview></listview>
</p>
)
}
}
Copy after login
class ContainerView extends Component { constructor(props) { super(props) this.state = {list: []} this.handleChange = this.handleChange.bind(this) } handleChange(e) { if (e.keyCode === 13) { const value = e.target.value e.target.value = '' this.setState((state, props) => { let list = state.list list.push(value) return {list} }) } } render() { return ( <p> <inputview></inputview> <listview></listview> </p> ) } }
e.keyCode === 13
表示一直监控到输入回车,开始更新状态
动图效果
codepen
https://codepen.io/ducafecat/...
3. Detailed explanation of the steps for component development in React
这个例子加入Detailed explanation of the steps for component development in React功能,这在表单操作中用的很频繁
图解说明
还是用代码说明
3.1 第一步:输入组件
代码
class InputView extends Component { constructor(props) { super(props) this.form = props.form // 父容器 state.form this.sync = props.sync // 父容器 sync this.handleChange = this.handleChange.bind(this) } handleChange(e) { let name = e.target.attributes.name.value let value = e.target.value this.sync({name, value}) } render() { return (
props.form
是容器传入的表单数据,结构如下
{ input: '', textarea: '', select: '' }
按控件名称 key / val
结构
props.sync
是回传父容器的事件,相应代码如下
handleChange(e) { let name = e.target.attributes.name.value let value = e.target.value this.sync({name, value}) }
可以发现回传的是 {控件名, 控件值}
,这里是简写(键、值 名相同时可以写一个),完整格式是
{ name: name, value: value }
3.2 第二步:展示组件
代码
function ListView(props) { let form = props.form let list = [] for (let key in form) { list.push({ key, value: form[key] }) } return (
-
{list &&
list.map((item, index) => (
- {item.key} - {item.value} ))}
这里做展示就简单了,接收到属性 form
后,格式化成数组 list
,然后 map
打印
3.3 第三步:容器组件
代码
class ContainerView extends Component { constructor(props) { super(props) this.state = {form: {input: '', textarea: '', select: ''}} this.handleSync = this.handleSync.bind(this) } handleSync(item) { this.setState((prevState, props) => { let form = prevState.form form[item.name] = item.value return {form} }) } render() { return ( <p> <inputview></inputview> <listview></listview> </p> ) } }
handleSync
中 form[item.name] = item.value
动态更新 key / value
达到更新 state
动图效果
codepen
https://codepen.io/ducafecat/...
建议
通过学习本章后,大家写具体功能代码前,可以先做下 UI组件架构设计
这个没有那么神秘,就是描述下有哪些组件、他们之间如何组装
如果大脑中抽象的不清楚,可以借助原型工具设计,自己能看懂就行,否则边写边设计容易乱掉
设计完成后,过几遍没啥问题了,再编写具体功能
代码
Detailed explanation of the steps for component development in Reactjs-example / 4-1-inputListView.js
Detailed explanation of the steps for component development in Reactjs-example / 4-2-formView.js
参考文
Lifting State Up
Thinking in React
相信看了本文案例你已经掌握了方法,更多精彩请关注php中文网其它相关文章!
推荐阅读:
The above is the detailed content of Detailed explanation of the steps for component development in React. For more information, please follow other related articles on the PHP Chinese website!

Hot AI Tools

Undresser.AI Undress
AI-powered app for creating realistic nude photos

AI Clothes Remover
Online AI tool for removing clothes from photos.

Undress AI Tool
Undress images for free

Clothoff.io
AI clothes remover

Video Face Swap
Swap faces in any video effortlessly with our completely free AI face swap tool!

Hot Article

Hot Tools

Notepad++7.3.1
Easy-to-use and free code editor

SublimeText3 Chinese version
Chinese version, very easy to use

Zend Studio 13.0.1
Powerful PHP integrated development environment

Dreamweaver CS6
Visual web development tools

SublimeText3 Mac version
God-level code editing software (SublimeText3)

Hot Topics

WeChat is one of the social media platforms in China that continuously launches new versions to provide a better user experience. Upgrading WeChat to the latest version is very important to keep in touch with family and colleagues, to stay in touch with friends, and to keep abreast of the latest developments. 1. Understand the features and improvements of the latest version. It is very important to understand the features and improvements of the latest version before upgrading WeChat. For performance improvements and bug fixes, you can learn about the various new features brought by the new version by checking the update notes on the WeChat official website or app store. 2. Check the current WeChat version We need to check the WeChat version currently installed on the mobile phone before upgrading WeChat. Click to open the WeChat application "Me" and then select the menu "About" where you can see the current WeChat version number. 3. Open the app

When logging into iTunesStore using AppleID, this error saying "This AppleID has not been used in iTunesStore" may be thrown on the screen. There are no error messages to worry about, you can fix them by following these solution sets. Fix 1 – Change Shipping Address The main reason why this prompt appears in iTunes Store is that you don’t have the correct address in your AppleID profile. Step 1 – First, open iPhone Settings on your iPhone. Step 2 – AppleID should be on top of all other settings. So, open it. Step 3 – Once there, open the “Payment & Shipping” option. Step 4 – Verify your access using Face ID. step

Having issues with the Shazam app on iPhone? Shazam helps you find songs by listening to them. However, if Shazam isn't working properly or doesn't recognize the song, you'll have to troubleshoot it manually. Repairing the Shazam app won't take long. So, without wasting any more time, follow the steps below to resolve issues with Shazam app. Fix 1 – Disable Bold Text Feature Bold text on iPhone may be the reason why Shazam is not working properly. Step 1 – You can only do this from your iPhone settings. So, open it. Step 2 – Next, open the “Display & Brightness” settings there. Step 3 – If you find that “Bold Text” is enabled

Screenshot feature not working on your iPhone? Taking a screenshot is very easy as you just need to hold down the Volume Up button and the Power button at the same time to grab your phone screen. However, there are other ways to capture frames on the device. Fix 1 – Using Assistive Touch Take a screenshot using the Assistive Touch feature. Step 1 – Go to your phone settings. Step 2 – Next, tap to open Accessibility settings. Step 3 – Open Touch settings. Step 4 – Next, open the Assistive Touch settings. Step 5 – Turn on Assistive Touch on your phone. Step 6 – Open “Customize Top Menu” to access it. Step 7 – Now you just need to link any of these functions to your screen capture. So click on the first

Is the clock app missing from your phone? The date and time will still appear on your iPhone's status bar. However, without the Clock app, you won’t be able to use world clock, stopwatch, alarm clock, and many other features. Therefore, fixing missing clock app should be at the top of your to-do list. These solutions can help you resolve this issue. Fix 1 – Place the Clock App If you mistakenly removed the Clock app from your home screen, you can put the Clock app back in its place. Step 1 – Unlock your iPhone and start swiping to the left until you reach the App Library page. Step 2 – Next, search for “clock” in the search box. Step 3 – When you see “Clock” below in the search results, press and hold it and

This AI-assisted programming tool has unearthed a large number of useful AI-assisted programming tools in this stage of rapid AI development. AI-assisted programming tools can improve development efficiency, improve code quality, and reduce bug rates. They are important assistants in the modern software development process. Today Dayao will share with you 4 AI-assisted programming tools (and all support C# language). I hope it will be helpful to everyone. https://github.com/YSGStudyHards/DotNetGuide1.GitHubCopilotGitHubCopilot is an AI coding assistant that helps you write code faster and with less effort, so you can focus more on problem solving and collaboration. Git

If you don't have control over the zoom level in Safari, getting things done can be tricky. So if Safari looks zoomed out, that might be a problem for you. Here are a few ways you can fix this minor zoom issue in Safari. 1. Cursor magnification: Select "Display" > "Cursor magnification" in the Safari menu bar. This will make the cursor more visible on the screen, making it easier to control. 2. Move the mouse: This may sound simple, but sometimes just moving the mouse to another location on the screen may automatically return it to normal size. 3. Use Keyboard Shortcuts Fix 1 – Reset Zoom Level You can control the zoom level directly from the Safari browser. Step 1 – When you are in Safari

Facing lag, slow mobile data connection on iPhone? Typically, the strength of cellular internet on your phone depends on several factors such as region, cellular network type, roaming type, etc. There are some things you can do to get a faster, more reliable cellular Internet connection. Fix 1 – Force Restart iPhone Sometimes, force restarting your device just resets a lot of things, including the cellular connection. Step 1 – Just press the volume up key once and release. Next, press the Volume Down key and release it again. Step 2 – The next part of the process is to hold the button on the right side. Let the iPhone finish restarting. Enable cellular data and check network speed. Check again Fix 2 – Change data mode While 5G offers better network speeds, it works better when the signal is weaker
