AntD Checkbox 的三种状态处理

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

AntD 对于Checkbox Group的实现如下

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'));
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CodeSandBox-Checkbox Group 三种状态的实现

如果要将Checkbox Group变成两种状态

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

const onChange = checkedList => {
  setCheckedList(checkedList);
  setCheckAll(checkedList.length !== 0);
};
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• 完整代码如下

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'));
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CodeSandBox-Checkbox Group 两种状态的实现

转载于:https://juejin.im/post/5ccecc12518825412c6504f1