如何将 URL 参数传递给选择器

Question

我从 useParams 收到一个 url 参数。我想使用 mapStateToProps.

将其传递给选择器

collection.component.jsx

import { useParams } from "react-router-dom";
import { connect } from "react-redux";

import { selectShopCollection } from "../../redux/shop/shop.selectors";

import './collection.styles.scss'

const Collection = ({ collection }) => {
  const { collectionId } = useParams();
  console.log(collection)
  return (
    <div>
      <h1>{collection}</h1>
    </div>
  )
}

const mapStateToProps = (state, ownProps) => ({
  collection: selectShopCollection(ownProps.match.params.collectionId)(state)
})

export default connect(mapStateToProps)(Collection);

shop.selectors.js

import { createSelector } from "reselect"

const selectShop = state => state.shop

export const selectShopCollections = createSelector([selectShop], shop =>
  shop.collections
)

export const selectShopCollection = collectionUrlParam =>
  createSelector([selectShopCollections], collections =>
    collections.find(collection => collection.id === collectionUrlParam)
  )

我想问题是，我无法使用 match 传递参数，因为 react-router-dom v6 不会在 props 中传递它。有没有其他方法可以将 collectionId 传递给选择器 selectShopCollection?

Answer 1

Collection组件可以由withRouter赋予道具。但它已被 react-router v6 弃用。因此，我们需要创建自己的 HOC 来包装我们的组件。我创建了一个这样的 HOC：

import { useParams } from "react-router-dom"

const withRouter = WrappedComponent => props => {
  const params = useParams()

  return (
    <WrappedComponent {...props} params={params} />
  )
}

export default withRouter;

查看 How to get parameter value from react-router-dom v6 in class 的这个答案，了解制作此 HOC 的原因。

并且，我们可以将 withRouter 导入到组件中，并在 compose 中与 connect 一起使用。在 compose 上阅读更多内容。它只是returns通过从右到左组合给定函数获得的最终函数。

const mapStateToProps = (state, ownProps) => ({
  collection: selectShopCollection(ownProps.params.collectionId)(state)
})

export default compose(withRouter, connect(mapStateToProps))(Collection)

Answer 2

因为 Collection 是一个函数组件，我建议从 react-redux 导入 useSelector 钩子，这样你就可以直接传递 collectionId 匹配参数。它简化了组件 API。 reselect 选择器与 useSelector 钩子配合使用效果很好。

import { useParams } from "react-router-dom";
import { useSelector } from "react-redux";

import { selectShopCollection } from "../../redux/shop/shop.selectors";
import './collection.styles.scss'

const Collection = () => {
  const { collectionId } = useParams();
  const collection = useSelector(selectShopCollection(collectionId));

  console.log(collection);

  return (
    <div>
      <h1>{collection}</h1>
    </div>
  )
};

export default Collection;

如何将 URL 参数传递给选择器

How do I pass a URL Param to a selector

reactjs

reselect

react-router-dom

react-hooks

mapstatetoprops