Question

如果没有来自AJAX请求的响应，我将无需向用户显示任何内容，即我将所有内容存储在数据库中。我的组件 GenericPage.jsx ：

export default class GenericPage extends React.Component {
componentWillMount() {
        if (this.store && this.onStoreUpdated) this.store.addChangeListener(this.onStoreUpdated);
        if (!this.state.page && this.state.pageId) {
            this.fetchData();
        }
    }
onPageStoreUpdated() {
        console.info('onPageStoreUpdated');
        var page = PageStore.getCurrentObject();
        this.setState({page: page, loaded: true}); // the error goes away if I comment this out
    }
    render() {
        ...
    }
}

My Express JS服务器代码：

server.get('*', function (req, res) {
        res.header("Access-Control-Allow-Origin", "*");
        match({routes, location: req.url}, (error, redirectLocation, renderProps) => {
            if (error) {
                res.send(500, error.message)
            } else if (redirectLocation) {
                res.redirect(302, redirectLocation.pathname + redirectLocation.search)
            } else if (renderProps) {
                let htmlStr = React.renderToString(<RoutingContext {...renderProps} />);
                res.header("Access-Control-Allow-Origin", "*");
                res.render('layout', { reactHtml: htmlStr });
            } else {
                console.log('not found')
                res.send(404, 'Not found')
            }
        })
    });

完整堆栈跟踪：

/Users/eric/af/frontend_app/node_modules/react/lib/getActiveElement.js:23
    return document.body;
           ^
ReferenceError: document is not defined
    at getActiveElement (/Users/eric/af/frontend_app/node_modules/react/lib/getActiveElement.js:23:12)
    at ReactReconcileTransaction.ReactInputSelection.getSelectionInformation (/Users/eric/af/frontend_app/node_modules/react/lib/ReactInputSelection.js:40:23)
    at ReactReconcileTransaction.Mixin.initializeAll (/Users/eric/af/frontend_app/node_modules/react/lib/Transaction.js:168:30)
    at ReactReconcileTransaction.Mixin.perform (/Users/eric/af/frontend_app/node_modules/react/lib/Transaction.js:133:12)
    at ReactUpdatesFlushTransaction.Mixin.perform (/Users/eric/af/frontend_app/node_modules/react/lib/Transaction.js:134:20)
    at ReactUpdatesFlushTransaction.assign.perform (/Users/eric/af/frontend_app/node_modules/react/lib/ReactUpdates.js:95:38)
    at Object.flushBatchedUpdates (/Users/eric/af/frontend_app/node_modules/react/lib/ReactUpdates.js:175:19)
    at Object.wrapper [as flushBatchedUpdates] (/Users/eric/af/frontend_app/node_modules/react/lib/ReactPerf.js:70:21)
    at ReactDefaultBatchingStrategyTransaction.Mixin.closeAll (/Users/eric/af/frontend_app/node_modules/react/lib/Transaction.js:207:25)
    at ReactDefaultBatchingStrategyTransaction.Mixin.perform (/Users/eric/af/frontend_app/node_modules/react/lib/Transaction.js:148:16)

我使用react 0.13.3和react-router 1.0.0

Answer 1

如果您只在浏览器中加载数据，请尝试将ComponentWillMount代码移至ComponentDidMount。

Answer 2

事实证明，在服务器端使用React组件是不可能的所以，我在我的React组件中将AJAX调用移到componentDidMount，这样它们就不会影响服务器端。
我需要在服务器端获取的数据，在我呈现React组件之前，我在任何React组件之外的服务器端Node JS代码中获取它们：

server.get('*', function (req, res) {
        res.header("Access-Control-Allow-Origin", "*");
        match({routes, location: req.url}, (error, redirectLocation, renderProps) => {
            if (renderProps) {
                someAsyncHttpRequest(someUrl)
                    .onSuccess((response) => {
                         page = response.body;
                         renderProps.params.page = page;

                         Dispatcher.dispatch({
                              actionType: AppAction.PAGE_FETCHED,
                              data: page
                         });
                    });
                let htmlStr = React.renderToString(<RoutingContext {...renderProps} />);
                res.render('layout', { reactHtml: htmlStr });
            }
        })
    });

React服务器端呈现AJAX setState（） - 未定义文档

2 个答案: