React 服务器渲染 --> 用新的根组件替换 React 渲染的子组件

IT技术 javascript reactjs server-rendering
2021-05-16 00:21:46

我正在尝试以同构方式呈现react,它呈现但我在客户端收到警告/错误说:

我使用 jspm 和 npm 作为包管理器;

warning.js:25 Warning: render(...): Replacing React-rendered children with a new root component. If you intended to update the children of this node, you should instead have the existing children update their state and render the new components instead of calling ReactDOM.render.

服务器输出的源代码renderToString

<div id="reactRoot"><div data-reactroot="" data-reactid="1" data-react-checksum="845161664"><marquee data-reactid="2"><h1 data-reactid="3">App</h1></marquee></div></div>

渲染后由 react 替换的源:

<div id="reactRoot"><div data-reactid=".0"><marquee data-reactid=".0.0"><h1 data-reactid=".0.0.0">App</h1></marquee></div></div>

快递服务器中间件:

import App from './components/App/App.jsx';
// [...] Express code removed for brevity
app.use('*', (req, res, next) => {
  try {
    res.render('index.html', {
      reactHtml: renderToString(
        <App />
      )
    });
  } catch (err) {
    next(err);
  }
});

index.html

<!DOCTYPE html>
<html>
<head>
  <meta charset="UTF-8">
  <title>App</title>
  <script>
    console.log('Running on <%- @env %> environment!');
    <% if (@env == 'development') : %>
    System.import('systemjs-hot-reloader/default-listener.js');
    <% end %>
    System.import('/app.jsx!')
    .catch(console.error.bind(console));
  </script>
</head>
<body>
  <div id="reactRoot"><%- reactHtml %></div>  
</body>
</html>

我在这里使用 ect 作为模板引擎;

app.jsx

import { render } from 'react-dom';
import App from './components/App/App.jsx';
const mountPoint = document.getElementById('reactRoot');
render(
  <App />,
  mountPoint
);

App/App.jsx

import React from 'react';

const App = () => (
  <div>
    <marquee><h1>App</h1></marquee>
  </div>
);

export default App;
1个回答

使用 renderToStaticMarkup

// render the dynamic code of the page to a string.
var appHtml = React.renderToString(<Application/>);

// now use React as a static templating language to create the <html>, 
// <head>, and <body> tags
var fullPageHtml = React.renderToStaticMarkup(<HtmlPage content={appHtml}/>);

res.write(fullPageHtml); 

可以在此处找到完整的问题解决讨论。 https://github.com/aickin/react-dom-stream/issues/4