Uncaught TypeError: Cannot read property 'push' of undefined (React-Router-Dom)

问题:

I have a Dashboard with rotating slides, each of which has a corresponding tab in Bldgs. Both Dashboard.js and Bldgs.js are children to my App.js.

When a user clicks on a specific slide A in Dashboard.js, Dashboard needs to tell App.js so that App can tell Bldgs.js to have tab A displayed when it routes to Bldgs.

I believe that I am passing the correct index value from Dashboard up to App and down to Bldgs. However, an error is being thrown in my App.js file stating:

Uncaught TypeError: Cannot read property 'push' of undefined

My code was working fine before I started passing my handleClick() function to my Dashboard component.

Index.js

import React from 'react'; import ReactDOM from 'react-dom'; import App from './App'; import './index.css'; import injectTapEventPlugin from 'react-tap-event-plugin'; import MuiThemeProvider from 'material-ui/styles/MuiThemeProvider'; import { BrowserRouter as Router } from 'react-router-dom'; import { hashHistory } from 'react-router';  // Needed for onTouchTap // http://stackoverflow.com/a/34015469/988941 injectTapEventPlugin();  ReactDOM.render(   <MuiThemeProvider>     <Router history={hashHistory}>       <App />     </Router>   </MuiThemeProvider>,   document.getElementById('root') ); 

App.js

import React from 'react'; import { Route } from 'react-router-dom'; import Dashboard from './Dashboard'; import Bldgs from './Bldgs';  var selectedTab;  class App extends React.Component {   constructor(props) {     super(props);     this.handleClick = this.handleClick.bind(this);     selectedTab = 0;   }    handleClick(value) {     selectedTab = value;     // console.log(selectedTab);     this.props.history.push('/Bldgs');     // console.log(this.props);   }    render() {     var _this = this;      return (       <div>         <Route exact path="/" render={(props) => <Dashboard {...props} handleClick={_this.handleClick} />} />         <Route path="/Bldgs" component={Bldgs} curTab={selectedTab} />       </div>     );   } }  export default App; 

Dashboard.js

import React, { Component } from 'react'; import './Dashboard.css'; import { AutoRotatingCarousel, Slide } from 'material-auto-rotating-carousel'; ...  var curIndex;  class Dashboard extends Component {   constructor(props) {     super(props);     this.handleEnter = this.handleEnter.bind(this);     this.handleChange = this.handleChange.bind(this);     curIndex = 0;   }    handleEnter(e) {     // console.log(curIndex);     this.props.handleClick(curIndex);   }    handleChange(value) {     // console.log(value);     curIndex = value;   }  ... }  export default Dashboard; 

Bldgs.js

... var curTab;  class Bldgs extends Component {   constructor(props) {     super(props);     this.handleChange = this.handleChange.bind(this);     this.goHome = this.goHome.bind(this);     curTab = 0;   }    handleChange(value) {     this.setState({'selectedTab': value});     console.log(this.state);   }    goHome(e) {     this.props.history.push('/');   }  ... }  export default Bldgs; 

回答1:

In order to make use of history in the App component use it with withRouter. You need to make use of withRouter only when your component is not receiving the Router props,

This may happen in cases when your component is a nested child of a component rendered by the Router or you haven't passed the Router props to it or when the component is not linked to the Router at all and is rendered as a separate component from the Routes.

import React from 'react'; import { Route , withRouter} from 'react-router-dom'; import Dashboard from './Dashboard'; import Bldgs from './Bldgs';  var selectedTab;  class App extends React.Component {   constructor(props) {     super(props);     this.handleClick = this.handleClick.bind(this);     selectedTab = 0;   }    handleClick(value) {     selectedTab = value;     // console.log(selectedTab);     this.props.history.push('/Bldgs');     // console.log(this.props);   }    render() {     var _this = this;      return (       <div>         <Route exact path="/" render={(props) => <Dashboard {...props} handleClick={_this.handleClick} />} />         <Route path="/Bldgs" component={Bldgs} curTab={selectedTab} />       </div>     );   } }  export default withRouter(App); 

Documentation on withRouter

回答2:

for React-router V4 change the function to

onClick={this.fun.bind(this)}

fun(){     this.props.history.push("/Home");    } 

and

import {browserHistory,withRouter} from "react-router-dom"  export default withRouter (comp_name); 

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