这让我发疯了。当我尝试在嵌套路由中使用React Router的链接时,链接会在浏览器中更新,但视图不会更改。然而,如果我将页面刷新到链接,它确实如此。不知何故,组件在应该(或者至少是目标)时不会更新。
这里是我的链接的样子(上一个/下一个项目真的是变种):
<Link to={'/portfolio/previous-item'}>
<button className="button button-xs">Previous</button>
</Link>
<Link to={'/portfolio/next-item'}>
<button className="button button-xs">Next</button>
</Link>
一个hacky解决方案是manaully调用forceUpate(),如:
<Link onClick={this.forceUpdate} to={'/portfolio/next-item'}>
<button className="button button-xs">Next</button>
</Link>
这样可行,但会导致整页刷新,我不想要并且出错:
ReactComponent.js:85 Uncaught TypeError: Cannot read property 'enqueueForceUpdate' of undefined
我已经搜索过高低的答案,而我最接近的就是:https://github.com/reactjs/react-router/issues/880。但它已经老了,我没有使用纯渲染混合。
以下是我的相关路线:
<Route component={App}>
<Route path='/' component={Home}>
<Route path="/index:hashRoute" component={Home} />
</Route>
<Route path="/portfolio" component={PortfolioDetail} >
<Route path="/portfolio/:slug" component={PortfolioItemDetail} />
</Route>
<Route path="*" component={NoMatch} />
</Route>
无论出于何种原因,调用Link不会导致组件重新安装需要发生的内容,以便获取新视图的内容。它确实调用了componentDidUpdate,我确定我可以检查url slug的变化,然后在那里触发我的ajax调用/视图更新,但似乎不需要这样做。
编辑(更多相关代码):
PortfolioDetail.js
import React, {Component} from 'react';
import { browserHistory } from 'react-router'
import {connect} from 'react-redux';
import Loader from '../components/common/loader';
import PortfolioItemDetail from '../components/portfolio-detail/portfolioItemDetail';
import * as portfolioActions from '../actions/portfolio';
export default class PortfolioDetail extends Component {
static readyOnActions(dispatch, params) {
// this action fires when rendering on the server then again with each componentDidMount.
// but not firing with Link...
return Promise.all([
dispatch(portfolioActions.fetchPortfolioDetailIfNeeded(params.slug))
]);
}
componentDidMount() {
// react-router Link is not causing this event to fire
const {dispatch, params} = this.props;
PortfolioDetail.readyOnActions(dispatch, params);
}
componentWillUnmount() {
// react-router Link is not causing this event to fire
this.props.dispatch(portfolioActions.resetPortfolioDetail());
}
renderPortfolioItemDetail(browserHistory) {
const {DetailReadyState, item} = this.props.portfolio;
if (DetailReadyState === 'WORK_DETAIL_FETCHING') {
return <Loader />;
} else if (DetailReadyState === 'WORK_DETAIL_FETCHED') {
return <PortfolioItemDetail />; // used to have this as this.props.children when the route was nested
} else if (DetailReadyState === 'WORK_DETAIL_FETCH_FAILED') {
browserHistory.push('/not-found');
}
}
render() {
return (
<div id="interior-page">
{this.renderPortfolioItemDetail(browserHistory)}
</div>
);
}
}
function mapStateToProps(state) {
return {
portfolio: state.portfolio
};
}
function mapDispatchToProps(dispatch) {
return {
dispatch: dispatch
}
}
export default connect(mapStateToProps, mapDispatchToProps)(PortfolioDetail);
PortfolioItemDetail.js
import React, {Component} from 'react';
import {connect} from 'react-redux';
import Gallery from './gallery';
export default class PortfolioItemDetail extends React.Component {
makeGallery(gallery) {
if (gallery) {
return gallery
.split('|')
.map((image, i) => {
return <li key={i}><img src={'/images/portfolio/' + image} alt="" /></li>
})
}
}
render() {
const { item } = this.props.portfolio;
return (
<div className="portfolio-detail container-fluid">
<Gallery
makeGallery={this.makeGallery.bind(this)}
item={item}
/>
</div>
);
}
}
function mapStateToProps(state) {
return {
portfolio: state.portfolio
};
}
export default connect(mapStateToProps)(PortfolioItemDetail);
gallery.js
import React, { Component } from 'react';
import { Link } from 'react-router';
const Gallery = (props) => {
const {gallery, prev, next} = props.item;
const prevButton = prev ? <Link to={'/portfolio/' + prev}><button className="button button-xs">Previous</button></Link> : '';
const nextButton = next ? <Link to={'/portfolio/' + next}><button className="button button-xs">Next</button></Link> : '';
return (
<div>
<ul className="gallery">
{props.makeGallery(gallery)}
</ul>
<div className="next-prev-btns">
{prevButton}
{nextButton}
</div>
</div>
);
};
export default Gallery;
新路线,基于Anoop的建议:
<Route component={App}>
<Route path='/' component={Home}>
<Route path="/index:hashRoute" component={Home} />
</Route>
<Route path="/portfolio/:slug" component={PortfolioDetail} />
<Route path="*" component={NoMatch} />
</Route>
答案 0 :(得分:3)
无法深究这一点,但我能够通过ComponentWillRecieveProps实现我的目标:
componentWillReceiveProps(nextProps){
if (nextProps.params.slug !== this.props.params.slug) {
const {dispatch, params} = nextProps;
PortfolioDetail.readyOnActions(dispatch, params, true);
}
}
换句话说,无论出于何种原因,当我使用React Router Link链接到具有相同父级组件的页面时,它不会触发componentWillUnMount / componentWillMount。所以我不得不手动触发我的行动。每当我使用不同的父组件链接到Routes时,它确实可以正常工作。
也许这是设计的,但它看起来不对,并不直观。我注意到Stackoverflow上有很多关于链接更改网址但没有更新网页的类似问题,所以我不是唯一的问题。如果有人对此有任何见解,我仍然希望听到它!
答案 1 :(得分:2)
分享组件代码也很好。但是,我尝试在本地重新创建它,并且对我来说工作正常。以下是示例代码
import { Route, Link } from 'react-router';
import React from 'react';
import App from '../components/App';
const Home = ({ children }) => (
<div>
Hello There Team!!!
{children}
</div>
);
const PortfolioDetail = () => (
<div>
<Link to={'/portfolio/previous-item'}>
<button className="button button-xs">Previous</button>
</Link>
<Link to={'/portfolio/next-item'}>
<button className="button button-xs">Next</button>
</Link>
</div>
);
const PortfolioItemDetail = () => (
<div>PortfolioItemDetail</div>
);
const NoMatch = () => (
<div>404</div>
);
module.exports = (
<Route path="/" component={Home}>
<Route path='/' component={Home}>
<Route path="/index:hashRoute" component={Home} />
</Route>
<Route path="/portfolio" component={PortfolioDetail} />
<Route path="/portfolio/:slug" component={PortfolioItemDetail} />
<Route path="*" component={NoMatch} />
</Route>
);
答案 2 :(得分:1)
我在React 16中也遇到了这个问题。
我的解决方案如下:
componentWillMount() {
const { id } = this.props.match.params;
this.props.fetchCategory(id); // Fetch data and set state
}
componentWillReceiveProps(nextProps) {
const { id } = nextProps.match.params;
const { category } = nextProps;
if(!category) {
this.props.fetchCategory(id); // Fetch data and set state
}
}
我使用redux来管理状态,但我认为这个概念是一样的。
在WillMount方法上按照正常情况设置状态,当调用WillReceiveProps时,如果状态已经更新,你可以检查状态是否已经更新,你可以回想起设置状态的方法,这应该重新渲染你的组件。
答案 3 :(得分:0)
componentWillReceiveProps是这个的答案,但它有点烦人。我编写了一个BaseController“概念”,它设置路由更改的状态操作,即使路由的组件是相同的。所以想象一下你的路线是这样的:
<Route path="test" name="test" component={TestController} />
<Route path="test/edit(/:id)" name="test" component={TestController} />
<Route path="test/anything" name="test" component={TestController} />
然后BaseController将检查路由更新:
import React from "react";
/**
* conceptual experiment
* to adapt a controller/action sort of approach
*/
export default class BaseController extends React.Component {
/**
* setState function as a call back to be set from
* every inheriting instance
*
* @param setStateCallback
*/
init(setStateCallback) {
this.setStateCall = setStateCallback
this.setStateCall({action: this.getActionFromPath(this.props.location.pathname)})
}
componentWillReceiveProps(nextProps) {
if (nextProps.location.pathname != this.props.location.pathname) {
this.setStateCall({action: this.getActionFromPath(nextProps.location.pathname)})
}
}
getActionFromPath(path) {
let split = path.split('/')
if(split.length == 3 && split[2].length > 0) {
return split[2]
} else {
return 'index'
}
}
render() {
return null
}
}
然后你可以继承那个:
从“反应”中导入React; 从'./BaseController'
导入BaseControllerexport default class TestController extends BaseController {
componentWillMount() {
/**
* convention is to call init to
* pass the setState function
*/
this.init(this.setState)
}
componentDidUpdate(){
/**
* state change due to route change
*/
console.log(this.state)
}
getContent(){
switch(this.state.action) {
case 'index':
return <span> Index action </span>
case 'anything':
return <span>Anything action route</span>
case 'edit':
return <span>Edit action route</span>
default:
return <span>404 I guess</span>
}
}
render() {
return (<div>
<h1>Test page</h1>
<p>
{this.getContent()}
</p>
</div>)
}
}
答案 4 :(得分:0)
我不确定是否可以解决原始问题,但是我遇到了类似的问题,可以通过传入函数回调() => this.forceUpdate()
而不是this.forceUpdate
来解决。
由于没有其他人提及它,因此我发现您正在使用onClick={this.forceUpdate}
,并且会尝试使用onClick={() => this.forceUpdate()}
。