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 componentsfunction##operation componentsdisplay componentsIllustration

##1.2.1 Container component

attributes

event

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

Search box in the diagram, receiving attributes

keywords generated new dataEvent Method to return container componentCode example

function SearchInput(props) {
  let 关键字 = props.关键字
  return (
    <p>
      <input>
    </p>
  )
}

properties

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

display component, split the component as much as possible2. Communication between components

control component

display componentillustration

we start writing Let’s take a look

function InputView(props) {
  return (
    <p>
      <input>
    </p>
  )
}

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onKeyDown

Second Step: Write the list display component

function ListView(props) {
  return (
    <ol>
      {props.datas &&
        props.datas.map((item, index) => (
          <li>{item}</li>
        ))}
    </ol>
  )
}

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map

The 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>
    )
  }
}

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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 (
      

        
•                    
        
•                    
        
•                        ---             Grapefruit             Lime             Coconut             Mango                    
      

• 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

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