React ERROR:TypeError: Cannot read property 'pathname' of undefined

Question

这是我的 Menu 组件。我稍后将其导入 routes.js。我收到此错误。

TypeError: Cannot read property 'pathname' of undefined

搜索并查看了一些解决方案后，看起来这可能是 route.js。有一些解决方案，建议使用 this.props.history.location.pathname 但它不起作用。

我也在下方发布了 routes.js。

Navbar.js分量

class Menu extends Component {
      constructor(props) {
        super(props);
        this.state = {
          collapseOpen: false,
          modalSearch: false,
          color: "navbar-transparent",
          isFull: false,
        };
      }

      goFull = () => {
        this.setState({ isFull: true });
      };

      componentDidMount() {
        window.addEventListener("resize", this.updateColor);
      }
      componentWillUnmount() {
        window.removeEventListener("resize", this.updateColor);
      }
      // function that adds color white/transparent to the navbar on resize (this is for the collapse)
      updateColor = () => {
        if (window.innerWidth < 993 && this.state.collapseOpen) {
          this.setState({
            color: "bg-white",
          });
        } else {
          this.setState({
            color: "navbar-transparent",
          });
        }
      };
      // this function opens and closes the collapse on small devices
      toggleCollapse = () => {
        if (this.state.collapseOpen) {
          this.setState({
            color: "navbar-transparent",
          });
        } else {
          this.setState({
            color: "bg-white",
          });
        }
        this.setState({
          collapseOpen: !this.state.collapseOpen,
        });
      };
      // this function is to open the Search modal
      toggleModalSearch = () => {
        this.setState({
          modalSearch: !this.state.modalSearch,
        });
      };
      render() {
        return (
          <Fullscreen
            enabled={this.state.isFull}
            onChange={(isFull) => this.setState({ isFull })}
          >
            <Navbar
              className={classNames("navbar-absolute", {
                [this.state.color]:
                  this.props.location.pathname.indexOf("full-screen-map") === -1,
              })}
              expand="lg"
            >
              <Container fluid>
                <div className="navbar-wrapper">
                  <div className="navbar-minimize d-inline">
                    <Button
                      className="minimize-sidebar btn-just-icon"
                      color="link"
                      id="tooltip209599"
                      onClick={this.props.handleMiniClick}
                    >
                      <i className="icon-align-center visible-on-sidebar-regular" />
                      <i className="icon-bullet-list-67 visible-on-sidebar-mini" />
                    </Button>
                    <UncontrolledTooltip
                      delay={0}
                      target="tooltip209599"
                      placement="right"
                    >
                      Sidebar toggle
                    </UncontrolledTooltip>
                  </div>
                  <div
                    className={classNames("navbar-toggle d-inline", {
                      toggled: this.props.sidebarOpened,
                    })}
                  >
                    <button
                      className="navbar-toggler"
                      type="button"
                      onClick={this.props.toggleSidebar}
                    >
                      <span className="navbar-toggler-bar bar1" />
                      <span className="navbar-toggler-bar bar2" />
                      <span className="navbar-toggler-bar bar3" />
                    </button>
                  </div>
                  <NavbarBrand href="#pablo" onClick={(e) => e.preventDefault()}>
                    {this.props.brandText}
                  </NavbarBrand>
                </div>
                <button
                  className="navbar-toggler"
                  type="button"
                  data-toggle="collapse"
                  data-target="#navigation"
                  aria-expanded="false"
                  aria-label="Toggle navigation"
                  onClick={this.toggleCollapse}
                >
                  <span className="navbar-toggler-bar navbar-kebab" />
                  <span className="navbar-toggler-bar navbar-kebab" />
                  <span className="navbar-toggler-bar navbar-kebab" />
                </button>
                <Collapse navbar isOpen={this.state.collapseOpen}>
                  <Nav className="ml-auto" navbar>
                    <InputGroup className="search-bar" tag="li">
                      <Button
                        color="link"
                        data-target="#searchModal"
                        data-toggle="modal"
                        id="search-button"
                        onClick={this.toggleModalSearch}
                      >
                        <i className="icon-zoom-split" />
                        <span className="d-lg-none d-md-block">Search</span>
                      </Button>
                    </InputGroup>
                    <UncontrolledDropdown nav>
                      <DropdownToggle
                        caret
                        color="default"
                        data-toggle="dropdown"
                        nav
                      >
                        <div className="notification d-none d-lg-block d-xl-block" />
                        <i className="icon-sound-wave" />
                        <p className="d-lg-none">Notifications</p>
                      </DropdownToggle>
                      <DropdownMenu className="dropdown-navbar" right tag="ul">
                        <NavLink tag="li">
                          <DropdownItem className="nav-item">
                            Mike John responded to your email
                          </DropdownItem>
                        </NavLink>
                        <NavLink tag="li">
                          <DropdownItem className="nav-item">
                            You have 5 more tasks
                          </DropdownItem>
                        </NavLink>
                        <NavLink tag="li">
                          <DropdownItem className="nav-item">
                            Your friend Michael is in town
                          </DropdownItem>
                        </NavLink>
                        <NavLink tag="li">
                          <DropdownItem className="nav-item">
                            Another notification
                          </DropdownItem>
                        </NavLink>
                        <NavLink tag="li">
                          <DropdownItem className="nav-item">
                            Another one
                          </DropdownItem>
                        </NavLink>
                      </DropdownMenu>
                    </UncontrolledDropdown>
                    <UncontrolledDropdown nav>
                      <DropdownToggle
                        caret
                        color="default"
                        data-toggle="dropdown"
                        nav
                        onClick={(e) => e.preventDefault()}
                      >
                        <div className="photo">
                          <img alt="user preferences" src={UserIcon} />
                        </div>
                        <b className="caret d-none d-lg-block d-xl-block" />
                        <p className="d-lg-none">Log out</p>
                      </DropdownToggle>
                      <DropdownMenu className="dropdown-navbar" right tag="ul">
                        <NavLink tag="li">
                          <DropdownItem className="nav-item">Profile</DropdownItem>
                        </NavLink>
                        <NavLink tag="li">
                          <DropdownItem className="nav-item">Settings</DropdownItem>
                        </NavLink>
                        <DropdownItem divider tag="li" />
                        <NavLink tag="li">
                          <DropdownItem className="nav-item">Log out</DropdownItem>
                        </NavLink>
                      </DropdownMenu>
                    </UncontrolledDropdown>
                    <li className="separator d-lg-none" />
                  </Nav>
                </Collapse>
              </Container>
            </Navbar>
          </Fullscreen>
        );
      }
    }

    export default Menu;

routes.js

import React from "react";
import { BrowserRouter as Router, Route, Switch } from "react-router-dom";

import AdminNavbar from "../components/Menu/Navbar";

const AppRouter = () => {
  return (
    <Router>
      <div>
        <Switch>
          <Route path="/navbar">
            <AdminNavbar />
          </Route>
        </Switch>
      </div>
    </Router>
  );
};

export default AppRouter;

Answer 1

`react-router-dom@5`

“注入”route props到组件

您可以将 AdminNavbar 呈现为 component、render 或 children render methods:

const AppRouter = () => {
  return (
    <Router>
      <div>
        <Switch>
          <Route path="/navbar" component={AdminNavbar} />
        </Switch>
      </div>
    </Router>
  );
};

或用withRouter高阶分量

装饰AdminNavbar

import { withRouter } from "react-router-dom";

class Menu extends Component {

  ...

  render() {
    return (
      <Fullscreen
        enabled={this.state.isFull}
        onChange={isFull => this.setState({ isFull })}
      >
        <Navbar
          className={classNames("navbar-absolute", {
            [this.state.color]:
              this.props.location.pathname.indexOf("full-screen-map") === -1
          })}
          expand="lg"
        >
          ...
        </Navbar>
      </Fullscreen>
    );
  }
}

export default withRouter(Menu);

`react-router-dom@6`

react-router-dom v6 删除了路由道具。如果需要访问 class 组件中的“route props”，您将需要创建自定义 withRouter HOC，因为它在 v6 中也被删除了。 请记住 navigate 函数替换了 history 对象 。

示例：

import { useLocation, useNavigation, useParams } from 'react-router-dom';

const withRouter = Component => props => (
  <Component
    {...props}
    location={useLocation()}
    navigate={useNavigate()}
    params={useParams()}
  />
);

export default withRouter;

Answer 2

在 react-router-dom 中不可用而是使用 <Routes> <Route path="/" component={componentName}> </Routes>

React ERROR:TypeError: Cannot read property 'pathname' of undefined