React 16: Warning: Expected server HTML to contain

2020-08-20 07:28发布

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I'm getting the following error using SSR

Warning: Expected server HTML to contain a matching <div> in <div>.

The issue is on the client when checking the browser width on component mount, and then setting the state of a component to render a mobile version of it instead.

But the server is defaulting the desktop version of the container as it is not aware of the browser width.

How do I deal with such a case? Can I somehow detect the browser width on the server and render the mobile container before sending to the client?

EDIT: For now I've decided to render the container when the component mounts. This way, both server and client side render nothing initially preventing this error.

I'm still open to a better solution

4条回答
forever°为你锁心
3楼-- · 2020-08-20 07:44

My solution is to use a middleware like express-useragent to detect the browser user agent.

Then, in the server side, create a viewsize like {width, height} by the following rules

if (ua.isMobile) {
  return {width: 360, height: 480}
}

if (ua.isDesktop) {
  return {width: 768, height: 600}
}

return {width: 360, height: 480} // default, and for bot

Then, it is still somehow a responsive design in SSR.

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啃猪蹄的小仙女
4楼-- · 2020-08-20 07:47

The current accepted answer doesn’t play well with TypeScript. Here is what works for me.

<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="utf-8" />
    <link rel="shortcut icon" href="/favicon.ico" />
    <meta name="viewport" content="width=device-width, initial-scale=1" />
  </head>
  <body>
    <noscript>
      You need to enable JavaScript to run this app.
    </noscript>
    <div id="root"></div>
  </body>
</html>

import React from "react"
import { hydrate, render } from "react-dom"
import BrowserRouter from "./routers/Browser"

const root = document.getElementById("root")
var renderMethod
if (root && root.innerHTML !== "") {
  renderMethod = hydrate
} else {
  renderMethod = render
}
renderMethod(<BrowserRouter />, document.getElementById("root"))
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一夜七次
5楼-- · 2020-08-20 07:55

This will solve the issue.

// Fix: Expected server HTML to contain a matching <a> in
const renderMethod = module.hot ? ReactDOM.render : ReactDOM.hydrate;
renderMethod(
  <BrowserRouter>
    <RoutersController data={data} routes={routes} />
  </BrowserRouter>,
  document.getElementById('root')
);
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