javascript - 使用 concat 更新 react 状态下的数组

Question

我有一个复选框组件，基本上我想做的是制作选中的数组并将信息发送到 api。但我无法更新状态数组而不删除最后插入的对象。我使用 concat 仍然得到相同的结果。这是整个组件的代码:

import React, { Fragment, Component } from 'react';
import { Inputt, Checkbox } from './style';

interface Istate {
  checked: boolean;
  products?: any[];
}
interface Iprops {
  id: any;
  value: any;
  changeValue?: (checkBoxId: string, value: any) => void;
}
class CheckBoxComp extends Component<Iprops, Istate> {
  state = {
    checked: true,
    products: [] as any,
  };

  addOne = (id: any, checked: any) => {
    let { products } = this.state;
    const newObj = { id, checked };
    products = products.concat(newObj);
    this.setState({ products }, () => {
      console.log(products);
    });
  };

  isChecked = (id: any) => {
    const { checked, products } = this.state;
    const { changeValue } = this.props;
    this.setState({
      checked: !checked,
    });
    if (changeValue) {
      changeValue(id, checked);
    }
    this.addOne(id, checked);
  };

  render() {
    const { id, value } = this.props;
    const { checked, products } = this.state;
    return (
      <Fragment>
        <Checkbox>
          <span />{' '}
          <label className="checkbox-wrapper">
            <span className="display" />
            <Inputt
              type="checkbox"
              value={checked}
              onChange={() => {
                this.isChecked(id);
              }}
            />
            <span className="checkmark" />
          </label>
        </Checkbox>
      </Fragment>
    );
  }
}

export default CheckBoxComp;

Answer 1

您可以尝试这种利用展开运算符来制作数组副本的方法:

addOne = (id: any, checked: any) => {
    this.setState((state: Istate): Partial<Istate> => ({
        products: [
            ...state.products,
            { id, checked },
        ],
    }), () => console.log(this.state.products));
};