What is the solution for correcting the error message "Prop `className` doesn't match. Server: 'MuiFormLabel-root-75....' "?

Currently using NextJS, I attempted to incorporate "@material-ui/core" into my project. Upon trying to utilize the TextField, I encountered the following error:

index.js:2178 Warning: Prop className did not match. Server: "MuiFormLabel-root-75 MuiInputLabel-root-64 MuiInputLabel-formControl-69 MuiInputLabel-animated-72" Client: "MuiFormLabel-root-16 MuiInputLabel-root-5 MuiInputLabel-formControl-10 MuiInputLabel-animated-13"

Snippet of my code:

import React from 'react'
import Button from '@material-ui/core/Button'
import TextField from '@material-ui/core/TextField'

 export default class Footer extends React.Component {
  static formTypes = ['employer', 'employee']

  formRef = null

  state = {
    formType: Footer.formTypes[0]
  }

  render () {
    return (
      <footer className="footer">
        <div className="footer__content">
          <div className="footer__block">
            <form id="footer__form">
              <TextField type="text" name="name" label="Name"/>

              <Button type="submit">Send</Button>
              <input type="hidden" value={'employer'}/>
            </form>

          </div>

          <div className="footer__block"></div>
        </div>
      </footer>
    )
  }
}

Any suggestions on how to resolve this issue?

Below is my package.json file for reference:

{
  "name": "custom-server-express",
  "version": "1.0.0",
  "scripts": {
    "dev": "node server.js",
    "build": "next build",
    "start": "NODE_ENV=production node server.js"
  },
  "dependencies": {
    "@material-ui/core": "^3.6.1",
    "@zeit/next-css": "^1.0.1",
    "@zeit/next-sass": "^1.0.1",
    "express": "^4.16.4",
    "next": "^7.0.2",
    "node-sass": "^4.10.0",
    "normalize.css": "^8.0.1",
    "react": "^16.6.3",
    "react-dom": "^16.6.3"
  },
  "devDependencies": {
    "babel-plugin-module-resolver": "^3.1.1"
  }
}

It's also worth noting that no other parts of @material-ui were imported in any other files within my codebase, only the mentioned section above.

reactjsmaterial-uinext.js

Answer №1

Dealing with this issue was quite frustrating for me, but I eventually managed to solve it.

In my solution, I incorporated reactjs, next, and material ui. The problem seemed to be related to how React loads the files and styles on both the server and client sides.

However, the crucial point is to make the following changes:

Instead of using classes, I recommend utilizing hooks like this:

import React, {useState} from 'react'
import Button from '@material-ui/core/Button'
import TextField from '@material-ui/core/TextField'

const Footer = (props) => {
    const formTypes = ['employer', 'employee'];
    const formRef = null;

    const [formType, setFormType] = Footer.formTypes[0];

    const myForm = (
        <footer className="footer">
            <div className="footer__content">
            <div className="footer__block">
                <form id="footer__form">
                <TextField type="text" name="name" label="Name"/>

                <Button type="submit">Send</Button>
                <input type="hidden" value={'employer'}/>
                </form>

            </div>

            <div className="footer__block"></div>
            </div>
        </footer>
    );

    return (
        {myForm}
    )
}

export default Footer;

Implementing your code in this manner would resemble the following...

import React from 'react'
import Button from '@material-ui/core/Button'
import TextField from '@material-ui/core/TextField'

export default class Footer extends React.Component {
  static formTypes = ['employer', 'employee']
  formRef = null

  state = {
    formType: Footer.formTypes[0]
  }

  render () {
    const myFormWithClasses = (
             <footer className="footer">
      <div className="footer__content">
        <div className="footer__block">
          <form id="footer__form">
            <TextField type="text" name="name" label="Name"/>

            <Button type="submit">Send</Button>
            <input type="hidden" value={'employer'}/>
          </form>

        </div>

        <div className="footer__block"></div>
      </div>
    </footer>
    )
    return (
     {myFormWithClasses}
    )
 }
}

The key is to isolate the elements of the component in a variable before rendering them.

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