AntD Checkbox 的三种状态处理

• 对于单个 Checkbox 来讲，只有两种值：选中 (checked) 或未选中 (unchecked) 。
• 但对于 Checkbox Group 来讲，却有三种值：全选 (checked) 、部分选中 (indeterminate) 、未选中(unchecked)

AntD 对于Checkbox Group的实现以下

import React, { useState } from 'react';
import ReactDOM from 'react-dom';
import 'antd/dist/antd.css';
import './index.css';
import { Checkbox } from 'antd';

const CheckboxGroup = Checkbox.Group;

const plainOptions = ['Apple', 'Pear', 'Orange'];
const defaultCheckedList = ['Apple', 'Orange'];

const App = () => {
  const [checkedList, setCheckedList] = useState(defaultCheckedList);
  const [indeterminate, setIndeterminate] = useState(true);
  const [checkAll, setCheckAll] = useState(false);

  const onChange = checkedList => {
    setCheckedList(checkedList);
    setIndeterminate(
      !!checkedList.length && checkedList.length < plainOptions.length
    );
    setCheckAll(checkedList.length === plainOptions.length);
  };

  const onCheckAllChange = e => {
    setCheckedList(e.target.checked ? plainOptions : []);
    setIndeterminate(false);
    setCheckAll(e.target.checked);
  };

  return (
    <div> <div style={{ borderBottom: '1px solid #E9E9E9' }}> <Checkbox indeterminate={indeterminate} onChange={onCheckAllChange} checked={checkAll} > Check all </Checkbox> </div> <br /> <CheckboxGroup options={plainOptions} value={checkedList} onChange={onChange} /> </div> ); }; ReactDOM.render(<App />, document.getElementById('container')); 复制代码

CodeSandBox-Checkbox Group 三种状态的实现

若是要将Checkbox Group变成两种状态

1. 去掉全选checkbox的indeterminate属性便可
2. 改变下onChange里setCheckAll的判断条件

const onChange = checkedList => {
  setCheckedList(checkedList);
  setCheckAll(checkedList.length !== 0);
};
复制代码

• 完整代码以下

import React, { useState } from 'react';
import ReactDOM from 'react-dom';
import 'antd/dist/antd.css';
import './index.css';
import { Checkbox } from 'antd';

const CheckboxGroup = Checkbox.Group;

const plainOptions = ['Apple', 'Pear', 'Orange'];
const defaultCheckedList = [];

const App = () => {
  const [checkedList, setCheckedList] = useState(defaultCheckedList);
  const [checkAll, setCheckAll] = useState(false);

  const onChange = checkedList => {
    setCheckedList(checkedList);
    setCheckAll(checkedList.length !== 0);
  };

  const onCheckAllChange = e => {
    setCheckedList(e.target.checked ? plainOptions : []);
    setCheckAll(e.target.checked);
  };

  return (
    <div> <div style={{ borderBottom: '1px solid #E9E9E9' }}> <Checkbox onChange={onCheckAllChange} checked={checkAll}> Check all </Checkbox> </div> <br /> <CheckboxGroup options={plainOptions} value={checkedList} onChange={onChange} /> </div> ); }; ReactDOM.render(<App />, document.getElementById('container')); 复制代码

CodeSandBox-Checkbox Group 两种状态的实现