javascript - React 功能链接不起作用

Question

抱歉，如果这是一个重复的问题。我似乎无法解决这个问题或找到答案。我有一个基本的 React Router 设置，我正在尝试开始工作，但我真的坚持让链接正常工作。

提前致谢。

线框示例

这是代码。

App.js

import React from 'react'
import reactDOM from 'react-dom'
import { Router, Route, hashHistory, IndexRoute } from 'react-router'
import About from "./About Us/About"
import FrontPage from "./Front Page/FrontPage"
import HeaderNavigation from './General/HeaderNavigation';


reactDOM.render((
    <Router history = {hashHistory}>
        <Route path="/" component={FrontPage}>
            <IndexRoute component = {HeaderNavigation}/>
            <Route path="/About" component={About}/>
        </Route>
    </Router>
), document.getElementById('app'));

HeaderNavigation.js

import React from 'react';
import { Nav, Navbar, NavDropdown, MenuItem, NavItem, Link } from 'react-bootstrap';


export default React.createClass ({
    render() {
        var Dlink = 'https://scontent-sjc2-1.xx.fbcdn.net/v/t1.0-9/12373357_497613000418878_5796459715901767943_n.png?oh=0484e476279b076d27eeeadc2d12b1d8&oe=590CD405'
        return (
            <div>
                <Navbar>
                    <Navbar.Header>
                        <Navbar.Brand>
                            <img src= {Dlink} alt="Legalink" height="6000 px"/>
                        </Navbar.Brand>
                    </Navbar.Header>
                        <Nav bsStyle = "pills">
                            <NavItem eventKey = "{1}" disabled>Product</NavItem>
                            <NavItem eventKey = "{2}">
                                <Link to ="/About">About</Link>
                            </NavItem>
                            <NavDropdown title  ="More" eventKey = "{3}">
                                <MenuItem eventKey = "{1}">Background</MenuItem>
                                <MenuItem eventKey = "{2}">Contact Us</MenuItem>
                            </NavDropdown>
                        </Nav>
                </Navbar>
        {this.props.children},
            </div>
        );
    }
});

About.js

    import React from "react";

/* Styles */
import Button from 'react-bootstrap/lib/Button';
import Grid from 'react-bootstrap/lib/Grid';
import Row from 'react-bootstrap/lib/Row';
import Col from 'react-bootstrap/lib/Col';


export default React.createClass({
    render() {
        return (
            <div>

                <Grid>
                    <Row>
                        <Col md={4}>
                            <h2>Legalink</h2>
                            <p>Our vision is to change the way Law firms engage with work and prove there worth</p>
                            <p><Button>View details »</Button></p>
                        </Col>
                        <Col md={4}>
                            <h2>Tiger Jockey's</h2>
                            <p>Our Tiger Jockey's are C-suite level professionals who know what it takes to stay on the ride</p>
                            <p><Button>View details »</Button></p>
                        </Col>
                        <Col md={4}>
                            <h2>Based in Melbourne Australia and founded by a mixture of Lawyers and Engineer's</h2>
                            <p>The right team to bring you the right product</p>
                            <p><Button>View details</Button></p>
                        </Col>
                    </Row>
                </Grid>
            </div>
        );
    }
});

FrontPage.js

/**
 * Created by Hewlbern on 30-Jan-17.
 */
import React from 'react';

import Carousel from './Carousel';
import Body from './Body';
import Footer from './Footer';

export default React.createClass({
    render() {
        return <div>

            <Carousel/>,
            <Body/>,
            <Footer/>,
        </div>
    }
})

body .js

import React from "react";

/* Styles */
import Button from 'react-bootstrap/lib/Button';
import Grid from 'react-bootstrap/lib/Grid';
import Jumbotron from 'react-bootstrap/lib/Jumbotron';
import Row from 'react-bootstrap/lib/Row';
import Col from 'react-bootstrap/lib/Col';
import typography from "../Assets/Typography"

export default React.createClass ( {
    render() {
        return (
            <div>
                <Jumbotron>
                    <Grid className = {typography}>
                        <h1>Tiger Jockey</h1>
                        <p>Bringing M&A to the Agile century</p>
                    </Grid>
                </Jumbotron>

                <Grid>
                    <Row>
                        <Col md={4}>
                            <h2 className = {typography}>Ride the Tiger</h2>
                            <p>Be the Jockey.</p>
                            <p><Button>View details »</Button></p>
                        </Col>
                        <Col md={4}>
                            <h2>Please your Customer</h2>
                            <p>Win more work</p>
                            <p><Button>View details »</Button></p>
                        </Col>
                        <Col md={4}>
                            <h2>Improve your process</h2>
                            <p>Make more money</p>
                            <p><Button>View details</Button></p>
                        </Col>
                    </Row>
                </Grid>
            </div>
        );
    }
});

我得到的错误是

"Warning: React.createElement: type should not be null, undefined, boolean, or number. It should be a string (for DOM elements) or a ReactClass (for composite components). Check the render method of `HeaderNavigation`.
printWarning @ warning.js:36
invariant.js:51Uncaught Error: Element type is invalid: expected a string (for built-in components) or a class/function (for composite components) but got: undefined. Check the render method of `HeaderNavigation`.
    at invariant (invariant.js:44)
    at instantiateReactComponent (instantiateReactComponent.js:68)
    at instantiateChild (ReactChildReconciler.js:44)
    at ReactChildReconciler.js:71
    at traverseAllChildrenImpl (traverseAllChildren.js:77)
    at traverseAllChildrenImpl (traverseAllChildren.js:93)
    at traverseAllChildren (traverseAllChildren.js:172)
    at Object.instantiateChildren (ReactChildReconciler.js:70)
    at ReactDOMComponent._reconcilerInstantiateChildren (ReactMultiChild.js:187)
    at ReactDOMComponent.mountChildren (ReactMultiChild.js:226)
ReactDOMComponentTree.js:106Uncaught TypeError: Cannot read property '__reactInternalInstance$gz5475fv0m1hbexy0fg6kzkt9' of null
    at Object.getClosestInstanceFromNode (ReactDOMComponentTree.js:106)
    at findParent (ReactEventListener.js:38)
    at handleTopLevelImpl (ReactEventListener.js:67)
    at ReactDefaultBatchingStrategyTransaction.perform (Transaction.js:140)
    at Object.batchedUpdates (ReactDefaultBatchingStrategy.js:62)
    at Object.batchedUpdates (ReactUpdates.js:97)
    at dispatchEvent (ReactEventListener.js:147)"

Answer 1

Link，因为您正在使用它，它来自 react-router，而不是 react-bootstrap。

您应该能够通过更改来修复它:

从 'react-bootstrap' 导入 { Nav, Navbar, NavDropdown, MenuItem, NavItem, Link };

到:


从“ react 路由器”导入{链接}；
import { Nav, Navbar, NavDropdown, MenuItem, NavItem } from 'react-bootstrap';