eric eric - 6 months ago 108
Ajax Question

React server-side rendering AJAX setState() - document is not defined

Without the response from the AJAX request, I will have nothing to display to the user i.e. I store everything in the database.
My component 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 server code:

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')
}
})
});


Full stack trace:

/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)


I'm using
react
0.13.3 and
react-router
1.0.0

Answer

Turns out it was not possible to achieve using React component on server side.
So, I moved the AJAX calls to componentDidMount in my React components so that they don't affect the server side.
The data that I need to get on the server side, I get them in my server side Node JS code, outside of any React component, before I render React components:

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 });
            }
        })
    });
Comments