Question

这里是React初学者，我目前正在学习Reactjs，因为大家都说React hooks更容易上手，所以我从hooks开始，但到处都是用classes反应，在这个例子中（antd表）是使用类编码，如果我目前已经理解，我应该将 'searchText:'',searchedColumn:'',' 放入 useState，并且不需要 useEffect ？因为没有 componentdimount 或 udpate ..？只是为了学习想把这个类的代码改成Hooks，因为英语不是我的母语，所以很抱歉：

import React from 'react';
import ReactDOM from 'react-dom';
import 'antd/dist/antd.css';
import './index.css';
import { Table, Input, Button, Space } from 'antd';
import Highlighter from 'react-highlight-words';
import { SearchOutlined } from '@ant-design/icons';

const data = [
  {
    key: '1',
    name: 'John Brown',
    age: 32,
    address: 'New York No. 1 Lake Park',
  },
  {
    key: '2',
    name: 'Joe Black',
    age: 42,
    address: 'London No. 1 Lake Park',
  },
  {
    key: '3',
    name: 'Jim Green',
    age: 32,
    address: 'Sidney No. 1 Lake Park',
  },
  {
    key: '4',
    name: 'Jim Red',
    age: 32,
    address: 'London No. 2 Lake Park',
  },
];

class App extends React.Component {
  state = {
    searchText: '',
    searchedColumn: '',
  };

  getColumnSearchProps = dataIndex => ({
    filterDropdown: ({ setSelectedKeys, selectedKeys, confirm, clearFilters }) => (
      <div style={{ padding: 8 }}>
        <Input
          ref={node => {
            this.searchInput = node;
          }}
          placeholder={`Search ${dataIndex}`}
          value={selectedKeys[0]}
          onChange={e => setSelectedKeys(e.target.value ? [e.target.value] : [])}
          onPressEnter={() => this.handleSearch(selectedKeys, confirm, dataIndex)}
          style={{ width: 188, marginBottom: 8, display: 'block' }}
        />
        <Space>
          <Button
            type="primary"
            onClick={() => this.handleSearch(selectedKeys, confirm, dataIndex)}
            icon={<SearchOutlined />}
            size="small"
            style={{ width: 90 }}
          >
            Search
          </Button>
          <Button onClick={() => this.handleReset(clearFilters)} size="small" style={{ width: 90 }}>
            Reset
          </Button>
          <Button
            type="link"
            size="small"
            onClick={() => {
              confirm({ closeDropdown: false });
              this.setState({
                searchText: selectedKeys[0],
                searchedColumn: dataIndex,
              });
            }}
          >
            Filter
          </Button>
        </Space>
      </div>
    ),
    filterIcon: filtered => <SearchOutlined style={{ color: filtered ? '#1890ff' : undefined }} />,
    onFilter: (value, record) =>
      record[dataIndex]
        ? record[dataIndex].toString().toLowerCase().includes(value.toLowerCase())
        : '',
    onFilterDropdownVisibleChange: visible => {
      if (visible) {
        setTimeout(() => this.searchInput.select(), 100);
      }
    },
    render: text =>
      this.state.searchedColumn === dataIndex ? (
        <Highlighter
          highlightStyle={{ backgroundColor: '#ffc069', padding: 0 }}
          searchWords={[this.state.searchText]}
          autoEscape
          textToHighlight={text ? text.toString() : ''}
        />
      ) : (
        text
      ),
  });

  handleSearch = (selectedKeys, confirm, dataIndex) => {
    confirm();
    this.setState({
      searchText: selectedKeys[0],
      searchedColumn: dataIndex,
    });
  };

  handleReset = clearFilters => {
    clearFilters();
    this.setState({ searchText: '' });
  };

  render() {
    const columns = [
      {
        title: 'Name',
        dataIndex: 'name',
        key: 'name',
        width: '30%',
        ...this.getColumnSearchProps('name'),
      },
      {
        title: 'Age',
        dataIndex: 'age',
        key: 'age',
        width: '20%',
        ...this.getColumnSearchProps('age'),
      },
      {
        title: 'Address',
        dataIndex: 'address',
        key: 'address',
        ...this.getColumnSearchProps('address'),
      },
    ];
    return <Table columns={columns} dataSource={data} />;
  }
}

ReactDOM.render(<App />, document.getElementById('container'));

也可以在此处找到代码：https://codesandbox.io/s/lq2it?file=/package.json

Answer 1

是的，searchText 和 searchedColumn 是状态，应该像这样用 useState 声明：

const [searchText, updateSearchText] = useState('default_state');
const [searchedColumn, updateSearchedColumn] = useState('default_state');

updateSearchText(some_value) 相当于

this.setState({
searchText : some_value
})

和 updateSearchedColumn 与上述相同，但对于状态：searchedColumn

将 antd 表数据转换为钩子

1 个答案: