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How to encapsulate Portal reusable components using React

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Jun 14, 2018 am 11:45 AM

reactComponent reuse

One of the cores of react is components. The following article mainly introduces you to the relevant information about the React tutorial of encapsulating a Portal reusable component. The article introduces it in detail through sample code. Friends who need it can refer to it. , let’s learn together below.

Portal Introduction

So we need a common component that does the following things:

Can be written declaratively in a component
does not actually render where it is declared
Supports transition animation

Then, components such as modal, tooltip, notification, etc. can be based on this component. We call this component Portal.

If you are using React16, you must at least know something about Portal or be proficient in using it.

Portal can create a DOM outside of your root element.

1. Usually your website only has one root

<body>
 <p id="root"></p>
</body>

2. After using Portal, it can become as follows

<body>
 <p id="root"></p>
 <p id="portal"></p>
</body>

Portal high-order component encapsulation

The demo of Portal can be seen on the official website, and what we want to achieve is to encapsulate it into a reusable components.

Goal

There is no need to manually add HTML under the body, create it yourself through the component.

<CreatePortal
 id, //可以传入id
 className, //可以传入className
 style //可以传入style
 >
 此处插入p或者react组件
</CreatePortal>

Implementation plan

1. Create a createPortal function, which will return a Portal component

function createPortal() {

}
export default createPortal()

2. Create a Portal component

import React from &#39;react&#39;
import ReactDOM from &#39;react-dom&#39;
import PropTypes from &#39;prop-types&#39;
function createPortal() {
 class Portal extends React.Component{
 }
 return Portal
}
export default createPortal()

3. Implement the render function and use createPortal to create the portal.

render() {
 return ReactDOM.createPortal(
  this.props.children,
  this.el
 )
}

4. Implementation of componentDidMount function, add dom to the body

componentDidMount() {
 document.body.appendChild(this.el);
}

5. Implementation of componentWillUnmount function, clear DOM structure

componentWillUnmount() {
   document.body.removeChild(this.el)
  }

6. Implementation of props, including id, className, style

constructor(props) {
 super(props)
 this.el = document.createElement(&#39;p&#39;)
 if (!!props) {
  this.el.id = props.id || false
  if (props.className) this.el.className = props.className
  if (props.style) {
   Object.keys(props.style).map((v) => {
    this.el.style[v] = props.style[v]
   })
  }
  document.body.appendChild(this.el)
 }
}

7, complete code

import React from &#39;react&#39;
import ReactDOM from &#39;react-dom&#39;
import PropTypes from &#39;prop-types&#39;
function createPortal() {
 class Portal extends React.Component{
  constructor(props) {
   super(props)
   this.el = document.createElement(&#39;p&#39;)
   if (!!props) {
    this.el.id = props.id || false
    if (props.className) this.el.className = props.className
    if (props.style) {
     Object.keys(props.style).map((v) => {
      this.el.style[v] = props.style[v]
     })
    }
    document.body.appendChild(this.el)
   }
  }
  componentDidMount() {
   document.body.appendChild(this.el);
  }
  componentWillUnmount() {
   document.body.removeChild(this.el)
  }
  render() {
   return ReactDOM.createPortal(
    this.props.children,
    this.el
   )
  }
 }
 Portal.propTypes = {
  style: PropTypes.object
 }
 return Portal
}
export default createPortal()

is what I compiled for everyone. I hope it will be helpful to everyone in the future.

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