How to use the contains method to achieve the effect of closing the current panel by clicking on a blank part of the interface

Today I added a small function to the component. You need to click on the blank part of the interface to close the current component. After searching for a while, I found that the main method is jquery. There are almost no js native methods and it crashes. . Finally got it out, just make a note for yourself, ps: I use react

The method to be used:

1.contains: It is to determine whether an element is selected. The child element (or itself) of the specified element;

2.window.event.target: Returns the target node of the event. For example, if you click on a

, it will return this h1; (the evil ie does not support it)

3.addEventListener: event listening, example, document.body.addEventListener('click',function(){ });

4.ref , this is a method provided by react to select real dom elements, and has the same effect as the js native document.document.getelementby... series

<strong>示例：<br/><p</strong><br/><strong>  ref={(r) => {</strong><br/><strong>    this.pElem = r;</strong><br/><strong>  }}</strong><br/><strong>></strong><br/><strong></p></strong>

The above is the usage of es6, es5 (not recommended) see here

After talking nonsense, the code on the picture above:

Rendering:

Code:

import React, { Component } from 'react';
import './index.less';

class CloseTheDomByClickBlankArea extends Component {
  state = {
    openCurrentArea: true,
  };

  componentDidMount() {
    // 点击blank_area区域，关闭current_area面板
    this.blankAreaElem.addEventListener('click', 
　    this.handleClickCloseCurrentArea.bind(this));
  }

  handleClickCloseCurrentArea() {
    // 当界面上渲染出内部面板时，可执行如下操作（若无此判断条件，点击打开面板按钮区域，
　　　  就会先触发如下操作，再触发handleClickOpenCurrentArea函数）
    if (document.body.contains(this.currentAreaElem)) {
      // 点击面板以外的部分（灰色区域以内，面板区域以外），就关闭面板
      if (this.blankAreaElem.contains(window.event.target) 
　　　　　&& !this.currentAreaElem.contains(window.event.target)
　　　 ) {
        this.setState({
          openCurrentArea: false,
        })
      }
    }
  }

  // 点击"打开面板"按钮，打开面板
  handleClickOpenCurrentArea() {
    this.setState({
      openCurrentArea: true,
    })
  }

  render() {
    return (
      <p
        className="blank_area"
        ref={(r) => {
          this.blankAreaElem = r;
        }}
      >

　　　   {/* 打开面板按钮 */}
        <a
          role="button"
          tabIndex="0"
          className="btn_open_current_area"
          onClick={this.handleClickOpenCurrentArea.bind(this)}
        >
          <p className="btn_open_current_area_text">打开面板</p>
        </a>

　　　

　　　   {/* 要关闭或开启的面板current_area */}

        {
          this.state.openCurrentArea
          &&
          <p
            className="current_area"
            ref={(r) => {
              this.currentAreaElem = r;
            }}
          >
            <p className="current_area_text">点击旁边灰色区域关闭当前面板</p>
          </p>
        }
      </p>
    );
  }
}

export default CloseTheDomByClickBlankArea;

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