React-router:如何手动调用链接？

Question

我是ReactJS和React-Router的新手.我有一个组件通过props接收<Link/>来自react-router的对象.每当用户点击该组件内的"下一个"按钮时,我想<Link/>手动调用对象.

现在,我正在使用refs访问支持实例并手动点击<Link/>生成的'a'标记.

问题:有没有办法手动调用链接(例如this.props.next.go)？

这是我目前的代码:

//in MasterPage.js
var sampleLink = <Link to="/sample">Go To Sample</Link>
<Document next={sampleLink} />

//in Document.js
...
var Document = React.createClass({
   _onClickNext: function() {
      var next = this.refs.next.getDOMNode();
      next.querySelectorAll('a').item(0).click(); //this sounds like hack to me
   },
   render: function() {
      return (
         ...
         <div ref="next">{this.props.next} <img src="rightArrow.png" onClick={this._onClickNext}/></div>
         ...
      );
   }
});
...

这是我想要的代码:

//in MasterPage.js
var sampleLink = <Link to="/sample">Go To Sample</Link>
<Document next={sampleLink} />

//in Document.js
...
var Document = React.createClass({
   render: function() {
      return (
         ...
         <div onClick={this.props.next.go}>{this.props.next.label} <img src="rightArrow.png" /> </div>
         ...
      );
   }
});
...

Answer 1

React Router v4 - 重定向组件(更新2017/04/15)

v4推荐的方法是允许render方法捕获重定向.使用state或props来确定是否需要显示重定向组件(然后触发重定向).

import { Redirect } from 'react-router';

// ... your class implementation

handleOnClick = () => {
  // some action...
  // then redirect
  this.setState({redirect: true});
}

render() {
  if (this.state.redirect) {
    return <Redirect push to="/sample" />;
  }

  return <button onClick={this.handleOnClick} type="button">Button</button>;
}

参考:https://reacttraining.com/react-router/web/api/Redirect

React Router v4 - 参考路由器上下文

您还可以利用Router暴露于React组件的上下文.

static contextTypes = {
  router: PropTypes.shape({
    history: PropTypes.shape({
      push: PropTypes.func.isRequired,
      replace: PropTypes.func.isRequired
    }).isRequired,
    staticContext: PropTypes.object
  }).isRequired
};

handleOnClick = () => {
  this.context.router.push('/sample');
}

这是如何<Redirect />在引擎盖下工作.

参考:https://github.com/ReactTraining/react-router/blob/master/packages/react-router/modules/Redirect.js#L46,L60

React Router v4 - 外部变异历史对象

如果您仍需要执行与v2实现类似的操作,则可以创建一个副本,BrowserRouter然后将其公开history为可导出的常量.下面是一个基本的例子,但如果需要,你可以编写它以注入可定制的道具.有生命周期的注意事项,但它应该总是重新渲染路由器,就像在v2中一样.这对于来自动作功能的API请求后的重定向非常有用.

// browser router file...
import createHistory from 'history/createBrowserHistory';
import { Router } from 'react-router';

export const history = createHistory();

export default class BrowserRouter extends Component {
  render() {
    return <Router history={history} children={this.props.children} />
  }
}

// your main file...
import BrowserRouter from './relative/path/to/BrowserRouter';
import { render } from 'react-dom';

render(
  <BrowserRouter>
    <App/>
  </BrowserRouter>
);

// some file... where you don't have React instance references
import { history } from './relative/path/to/BrowserRouter';

history.push('/sample');

最新BrowserRouter扩展:https://github.com/ReactTraining/react-router/blob/master/packages/react-router-dom/modules/BrowserRouter.js

反应路由器v2

将新状态推送到browserHistory实例:

import {browserHistory} from 'react-router';
// ...
browserHistory.push('/sample');

参考:https://github.com/reactjs/react-router/blob/master/docs/guides/NavigatingOutsideOfComponents.md

Answer 2

React Router 4包含一个withRouter HOC,history通过this.props以下方式可以访问该对象:

import React, {Component} from 'react'
import {withRouter} from 'react-router-dom'

class Foo extends Component {
  constructor(props) {
    super(props)

    this.goHome = this.goHome.bind(this)
  }

  goHome() {
    this.props.history.push('/')
  }

  render() {
    <div className="foo">
      <button onClick={this.goHome} />
    </div>
  }
}

export default withRouter(Foo)

Answer 3

在5.x 版本中，您可以使用以下useHistory钩子react-router-dom：

// Sample extracted from https://reacttraining.com/react-router/core/api/Hooks/usehistory
import { useHistory } from "react-router-dom";

function HomeButton() {
  const history = useHistory();

  function handleClick() {
    history.push("/home");
  }

  return (
    <button type="button" onClick={handleClick}>
      Go home
    </button>
  );
}

Answer 4

https://github.com/rackt/react-router/blob/bf89168acb30b6dc9b0244360bcbac5081cf6b38/examples/transitions/app.js#L50

或者甚至可以尝试执行onClick这个（更暴力的解决方案）：

window.location.assign("/sample");