如何确定当前路由在 React 中是否处于活动状态

Question

react v0.14.7 / react-router: v2.0.1

I have my Routes set up as follows:

import { Router, Route, IndexRoute, hashHistory } from "react-router"

ReactDOM.render(
  <Router history={hashHistory}>
    <Route path="/" component={App}>
      <IndexRoute component={Index}/>
      <Route path="/locations" component={Locations}/>
      <Route path="/products" component={Products}/>
    </Route>
  </Router>, 
  document.getElementById('app'));

I'm trying to write a method in one of my React classes (created using the following API)

export default class MyClass extends React.Component {...}

...that determines if the current URL's path is a particular route's path.

For example. Assuming the current URL is http://domain/products then calling:

isActive('/products')

would return TRUE

I'm aware of React Router's Link object activeClassName . But I need to write something that looks this up programmatically in a different location to where I defined the <link/> objects.

Looking in node_modules/react-router/ I can see modules/isActive.js that does what I need, however it's not export ed in modules/index.js , so i'm assuming I cannot access it?

I also see from the API docs that there is an RouterContext isActive method , but again, I don't know how to call this?

Answer 1

OK thanks to Mike 'Pomax' Kamermans, I resolved the issue like so:

Changed create class API from:

export default class MyClass extends React.Component {

    ...  

}

to:

export default React.createClass({
    ...
})

And added the following contextTypes definition to the class:

export default React.createClass({

  contextTypes: {
    router: React.PropTypes.object
  },

  render(){

    console.log(this.context.router.isActive('/foo')); // Now works :)

    ...
  }

})