react-router-dom：无效的钩子调用，只能在功能组件主体内部调用钩子

时间：2019-10-17 14:33:36

标签： javascript reactjs routes react-router react-router-dom

我尝试嵌套一条路线：我在 Catalog 组件中有一个产品目录，与URL “ backoffice / catalog” 匹配。

如果URL与“ backoffice / catalog / edit” 匹配，我想路由到 Edition 组件，但是我需要 Edition 组件成为目录的孩子以分享道具。

我真的不明白为什么嵌套路线不起作用，请救救我！而且不要犹豫告诉我我的应用程序是否有任何问题，我非常了解Javascript，但是我从React：D

开始

这是我的App组件：

import React from "react";
import { Route, Switch } from "react-router-dom";
import { Home } from "./components/Static/Home.js";
import { Dashboard } from "./components/Backoffice/Dashboard.js";
import { Catalog } from "./components/Backoffice/catalog/Catalog.js";
import { Login } from "./components/Login/Login.js";
import { Signup } from "./components/Signup/Signup.js";
import { PrivateRoute } from "./components/PrivateRoute.js";
import "./scss/App.scss";
import {Header} from "./components/Structure/Header";
import {BOHeader} from "./components/Structure/Backoffice/Header";
import {List} from "./components/Listing/List";

function App()
{
  return (
    <div className="App">
      <div className="App-content">
          <Switch>
              <Route path='/backoffice' component={BOHeader} />
              <Route path='/' component={Header} />
          </Switch>
          <Switch>
              <Route exact path='/' component={Home} />
              <Route exact path='/login' component={Login} />
              <Route exact path='/signup' component={Signup} />
              <Route path='/listing' component={List}/>
              <PrivateRoute exact path='/backoffice' component={Dashboard}/>
              <PrivateRoute exact path='/backoffice/catalog' component={Catalog}/>
          </Switch>
      </div>
    </div>
  );
}

export default App;

这是我的目录组件（路由是通过render方法创建的：

import React from 'react';
import Data from '../../../Utils/Data';
import {Product} from './Product';
import {Edition} from './Edition';
import {
    BrowserRouter as Router,
    Switch,
    Route,
    Link,
    useRouteMatch,
    useParams
} from "react-router-dom";

export class Catalog extends React.Component
{
    state = {
        title: '',
        products: [],
        editionProduct: null
    };

    obtainProducts = () =>
    {
        Data.products.obtain()
            .then(products => {this.setState({products: products});})
    };

    editProductHandler = product =>
    {
        this.setState({editionProduct: product});
    };

    saveProductHandler = product =>
    {
        Data.products.save(product).then(() => {
            this.state.products.map(item => {
                item = item._id === product._id ? product : item;
                return item;
            })
        });
    };

    deleteProductHandler = event =>
    {
        const productId = event.target.closest('.product-actions').dataset.productid;
        let products = this.state.products.filter(product => {
            return product._id !== productId;
        });
        this.setState({products: products}, () => {
            Data.products.remove(productId);
        });
    };

    displayProducts = () =>
    {
        return this.state.products.map(product => {
           return (
                <li key={product._id} className='catalog-item'>
                   <Product
                       deleteProductHandler={this.deleteProductHandler}
                       editProductHandler={this.editProductHandler}
                       data={product}
                   />
               </li>
            )
        });
    };


    componentWillMount()
    {
        this.obtainProducts();
    }

    render() {
        const Products = this.displayProducts();
        let { path, url } = useRouteMatch();
        return (
            <div className={this.state.editionProduct ? 'catalog edit' : 'catalog'}>
                <h1>Catalog</h1>
                <Switch>
                    <Route exact path={path}>
                        <ul className='catalog-list'>{Products}</ul>
                    </Route>
                    <Route path={`${path}/edit`}>
                        <Edition saveProductHandler={this.saveProductHandler} product={this.state.editionProduct} />
                    </Route>
                </Switch>
            </div>
        );
    }
}

有什么想法吗？

2 个答案:

答案 0 :(得分：5)

您不能在Catalog组件内使用钩子，因为它是一个类组件。因此，您有两种方法可以解决问题：

  1. 将您的组件从类重写为功能。
  2. 请勿在{{1​​}}组件内使用useRouteMatch。如果需要在组件内部获取Catalog数据，则需要使用withRouter高阶组件。

因此，如果您选择第二种方法，则需要将match组件包装在Catalog中：

withRouter

在export default withRouter(Catalog); 函数中从以下位置更改一行：

render

收件人：

let { path, url } = useRouteMatch();

也不要忘记更改const { path, url } = this.props.match; 组件的导入，因为现在您的组件将默认导出。

答案 1 :(得分：4)

由于使用Typescript设置React Router时遇到了相同的问题，因此我将分4个步骤详细介绍Andrii答案：

1-npm /纱包

yarn add react-router-dom --save
yarn add @types/react-router-dom --save-dev

或

npm install react-router-dom --save
npm install @types/react-router-dom --save-dev

2-index.tsx

1）导入高阶组件（在当前情况下为App）时，请勿使用大括号，因为App将默认导出；

2）BrowserRouter需要处于较高级别，而不是将作为“ default withRouter（Class）”导出的类，以防止出现以下错误：

“您不应在路由器外部使用Route或withRouter（）” 

import React from 'react';
import ReactDOM from 'react-dom';
import { BrowserRouter } from 'react-router-dom';
import * as serviceWorker from './serviceWorker';
import App from './app';

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

serviceWorker.unregister();

3-app.tsx

1）使用路由器和RouteComponentProps（或您自己的PropType定义）从 react-router-dom 导入；

2）扩展React.Component并使用RouteComponentProps接口；

3）将道具传递到要共享路由数据的组件；

4）使用路由器将高阶类导出为默认值。

import React, { ReactElement } from 'react';
import { Switch, Route, withRouter, RouteComponentProps } from 'react-router-dom';
import { ExpensesPage } from './pages/expenses/expenses.page';
import { HomePage } from './pages/home/home.page';
import { HeaderComponent } from './components/header/header.component';
import './app.scss';

class App extends React.Component<RouteComponentProps> {
  public render(): ReactElement {
    return (
      <div className='playground'>
        <HeaderComponent {...this.props} />
        <div className="playground-content">
          <Switch>
            <Route exact path='/' component={HomePage} {...this.props} />
            <Route exact path='/expenses' component={ExpensesPage} {...this.props} />
          </Switch>
        </div>
      </div>
    );
  }
}

export default withRouter(App);

4-header.component

通过RouteComponentProps扩展类，您通常可以以历史记录，位置和下面的方式访问路由道具：

import React, { ReactElement } from 'react';
import { RouteComponentProps } from 'react-router-dom';
import './header.component.scss';

export class HeaderComponent extends React.Component<RouteComponentProps> {
  public render(): ReactElement {
    const { location } = this.props;
    console.log(location.pathname);

    return (
      <header className="header">
        {/* ... */}
      </header >
    );
  }
}

希望它会有所帮助，因为要使它在具有webpack且没有redux的简单环境中进行工作有一点挑战。上一次可在以下版本上正常使用：

{
    "react": "^16.12.0",
    "react-dom": "^16.12.0",
    "react-router-dom": "^5.1.2",
    "sass-loader": "^8.0.2",
    "style-loader": "^1.1.3",
    "typescript": "^3.8.2",
    "webpack": "^4.41.6",
    "webpack-dev-server": "^3.10.3",
},
{
    "@types/react-router-dom": "^5.1.3",
    "webpack-cli": "^3.3.11"
}
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