How can you adjust the width of the Material UI Select component?

Trying to customize the width of the Material UI Select component can be a bit tricky. To set the desired width, you need to assign a specific class to the FormControl component. This class, such as mw-120, should define the minimum width as 120px in your CSS.

Here is an example using the Material UI Select component:

<FormControl className='mw-120'>
    <InputLabel htmlFor='selected-language'>Language</InputLabel>
    <Select value={this.state.selectedLanguage}
            onChange={(e) => this.onLanguageChange(e.target.value)}
            inputProps={{
                name: 'language',
                id: 'selected-language',
            }}>
        {menuItems}
    </Select>
</FormControl>

Your CSS class definition for the width:

.mw-120 {
    min-width: 120px;
}

However, even after applying the class, the width of the Select component may not change as expected. In some cases, like shown in the image below, the component remains narrow and does not extend beyond the label "Language."

An inspection using Chrome Developer Tools reveals that the main DIV element of the component has a class .MuiFormControl-root-234 with min-width: 0;, which seems to override your custom class. Is there another method to adjust the width of the Material UI Select component effectively? Unfortunately, the official Material UI documentation lacks clear examples on this aspect.

Answer №1

When it comes to styling something for a one-time use, consider utilizing the inline style option as a quick solution that is effective.

<FormControl style={{minWidth: 120}}> // this line
    <InputLabel htmlFor='selected-language'>Language</InputLabel>
    <Select value={this.state.selectedLanguage}
            onChange={(e) => this.onLanguageChange(e.target.value)}
            inputProps={{
                name: 'language',
                id: 'selected-language',
            }}>
        {menuItems}
    </Select>
</FormControl>

If you anticipate reusing this code and wish to prevent redundancy, exploring Themes might be beneficial.

Answer №2

When looking to potentially re-use code snippets, the official documentation samples demonstrate how to achieve this using makeStyles in the following manner:

import { makeStyles } from '@material-ui/core/styles';

const useStyles = makeStyles((theme) => ({
  formControl: {
    margin: theme.spacing(1),
    minWidth: 120,
  },
}));

The useStyles function is then used to generate class names like this:

const classes = useStyles();

To incorporate these styles into your application, add them to your FormControl component as shown here:

<FormControl className={classes.formControl}>

Demo Using Stack Snippets

const { FormControl, InputLabel, Select, MenuItem, makeStyles } = MaterialUI;

const App = function () {

  const useStyles = makeStyles((theme) => ({
    formControl: {
      margin: theme.spacing(1),
      minWidth: 120,
    },
  }));

  const classes = useStyles();

  return (
    <div className="App">
      <FormControl className={classes.formControl}>
        <InputLabel id="demo-simple-select-label">Age</InputLabel>
        <Select
          labelId="demo-simple-select-label"
          id="demo-simple-select"
          value={''}
        >
          <MenuItem value={10}>Ten</MenuItem>
          <MenuItem value={20}>Twenty</MenuItem>
          <MenuItem value={30}>Thirty</MenuItem>
        </Select>
      </FormControl>
    </div>
  )
}

ReactDOM.render(
   <App />,
   document.getElementById('root')
);
<script src="https://unpkg.com/<a href="/cdn-cgi/l/email-protection" class="__cf_email__" data-cfemail="097b6c686a7d49383e2739273b">[email protected]</a>/umd/react.development.js"></script>
<script src="https://unpkg.com/<a href="/cdn-cgi/l/email-protection" class="__cf_email__" data-cfemail="2a584f4b495e074e45476a1b1d041a0418">[email protected]</a>/umd/react-dom.development.js"></script>
<script src="https://unpkg.com/@material-ui/<a href="/cdn-cgi/l/email-protection" class="__cf_email__" data-cfemail="6b0804190e2b5f455a5a4558">[email protected]</a>/umd/material-ui.development.js"></script>

<div id="root"></div>

Answer №3

In Material UI version 5, you have the option to utilize the sx prop. It's important to note that in the example below, we are using a select TextField, which is essentially similar to a Select component but with the added ability to display the label and helper text. To learn more about how the TextField works, refer to this answer.

<TextField select label="Select" sx={{ minWidth: 130 }}>
  {currencies.map((option) => (
    <MenuItem key={option.value} value={option.value}>
      {option.label}
    </MenuItem>
  ))}
</TextField>

https://codesandbox.io/s/56120213-set-material-ui-select-width-0k1is?file=/demo.js

Answer №4

In our scenario, the selectors .MuiFormControl-root and .mv-120 hold equal specificity levels, therefore, the declaration order becomes crucial. The styles generated are injected last in the <head> section of the page. When custom styles also exist in this section, they carry a lower priority:

const { FormControl, InputLabel, Select, MenuItem } = MaterialUI

const App = function () {
    return (<FormControl className="mw-120">
        <InputLabel id="language-label">Language</InputLabel>
        <Select
            labelId="language-label"
            id="language"
            value="">
            <MenuItem value={"en"}>English</MenuItem>
            <MenuItem value={"de"}>German</MenuItem>
            <MenuItem value={"ru"}>Russian</MenuItem>
        </Select>
    </FormControl>)
}

ReactDOM.render(<App />, document.getElementById('root'))
.mw-120 {
    min-width: 120px;
}
<script src="https://unpkg.com/<a href="/cdn-cgi/l/email-protection" class="__cf_email__" data-cfemail="592b3c383a2d19686e7769776b">[email protected]</a>/umd/react.development.js"></script>
<script src="https://unpkg.com/<a href="/cdn-cgi/l/email-protection" class="__cf_email__" data-cfemail="0d7f686c6e79206962604d3c3a233d233f">[email protected]</a>/umd/react-dom.development.js"></script>
<script src="https://unpkg.com/@material-ui/<a href="/cdn-cgi/l/email-protection" class="__cf_email__" data-cfemail="1d7e726f785d29332c2c332e">[email protected]</a>/umd/material-ui.development.js"></script>

<div id="root"></div>

However, if custom styles reside in the <body> section, they will be given higher precedence:

const { FormControl, InputLabel, Select, MenuItem } = MaterialUI

const App = function () {
    return (<FormControl className="mw-120">
        <InputLabel id="language-label">Language</InputLabel>
        <Select
            labelId="language-label"
            id="language"
            value="">
            <MenuItem value={"en"}>English</MenuItem>
            <MenuItem value={"de"}>German</MenuItem>
            <MenuItem value={"ru"}>Russian</MenuItem>
        </Select>
    </FormControl>)
}

ReactDOM.render(<App />, document.getElementById('root'))
<script src="https://unpkg.com/<a href="/cdn-cgi/l/email-protection" class="__cf_email__" data-cfemail="2351464240576312140d130d11">[email protected]</a>/umd/react.development.js"></script>
<script src="https://unpkg.com/<a href="/cdn-cgi/l/email-protection" class="__cf_email__" data-cfemail="ff8d9a9e9c8bd29b9092bfcec8d1cfd1cd">[email protected]</a>/umd/react-dom.development.js"></script>
<script src="https://unpkg.com/@material-ui/<a href="/cdn-cgi/l/email-protection" class="__cf_email__" data-cfemail="15767a677055213b24243b26">[email protected]</a>/umd/material-ui.development.js"></script>

<style>
  .mw-120 {
    min-width: 120px;
  }
</style>

<div id="root"></div>

Alternative methods for managing the placement of generated <style> tags are discussed here.

Answer №5

One option is to utilize inline styling, which has been effective for me personally.

<FormControl size="small" sx={{ width: "100%" }}>
              <InputLabel id="demo-select-small-label">Delay</InputLabel>
              <Select
                labelId="demo-select-small-label"
                id="demo-select-small"
                // value={delay}
                label="Delay"
                // onChange={handleOnDelayChange}
              >
                <MenuItem value={1000}>1 sec</MenuItem>
                <MenuItem value={2000}>2 sec</MenuItem>
                <MenuItem value={3000}>3 sec</MenuItem>
              </Select>
            </FormControl>

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