css - Material-UI How to set minWidth and maxWidth of MenuItem (popover) according to the width of the select component

Question

The width of the popover, to be precise. No matter how long the text of menu item is, I want the width of the popover always the same as the select component. Set the autoWidth to true or false is not helping.

following are code for the select component:

import React from 'react';
import { makeStyles } from '@material-ui/core/styles';
import OutlinedInput from '@material-ui/core/OutlinedInput';
import InputLabel from '@material-ui/core/InputLabel';
import MenuItem from '@material-ui/core/MenuItem';
import FormControl from '@material-ui/core/FormControl';
import Select from '@material-ui/core/Select';

const useStyles = makeStyles(theme => ({
  root: {
    display: 'flex',
    flexWrap: 'wrap',
  },
  formControl: {
    margin: theme.spacing(1),
    minWidth: 120,
  },
}));

function SimpleSelect() {
  const classes = useStyles();
  const [values, setValues] = React.useState({
    age: '',
  });

  const inputLabel = React.useRef(null);
  const [labelWidth, setLabelWidth] = React.useState(0);
  React.useEffect(() => {
    setLabelWidth(inputLabel.current.offsetWidth);
  }, []);

  function handleChange(event) {
    setValues(oldValues => ({
      ...oldValues,
      [event.target.name]: event.target.value,
    }));
  }

  return (
    <form className={classes.root} autoComplete="off">
      <FormControl variant="outlined" className={classes.formControl}>
        <InputLabel ref={inputLabel} htmlFor="outlined-age-simple">
          Age
        </InputLabel>
        <Select
          value={values.age}
          onChange={handleChange}
          input={<OutlinedInput labelWidth={labelWidth} name="age" id="outlined-age-simple" />}
        >
          <MenuItem value="">
            <em>None</em>
          </MenuItem>
          <MenuItem value={10}>Ten</MenuItem>
          <MenuItem value={20}>Twenty</MenuItem>
          <MenuItem value={30}>Thirty</MenuItem>
        </Select>
      </FormControl>
    </form>
  );
}

export default SimpleSelect;

How can I achive this?

标签： cssreactjswidthmaterial-uihtml-select

Answer 1

您可以通过在菜单项上设置与表单控件的宽度相同的显式宽度来实现此目的。

下面是一个例子：

import React from "react";
import { makeStyles } from "@material-ui/core/styles";
import InputLabel from "@material-ui/core/InputLabel";
import MuiMenuItem from "@material-ui/core/MenuItem";
import FormControl from "@material-ui/core/FormControl";
import Select from "@material-ui/core/Select";

const selectWidth = 150;

const useStyles = makeStyles(theme => ({
  root: {
    display: "flex",
    flexWrap: "wrap"
  },
  formControl: {
    margin: theme.spacing(1),
    width: selectWidth
  },
  selectEmpty: {
    marginTop: theme.spacing(2)
  }
}));

const useMenuItemStyles = makeStyles(theme => ({
  menuItem: {
    width: selectWidth
  }
}));

function MenuItem(props) {
  const classes = useMenuItemStyles(props);
  return <MuiMenuItem className={classes.menuItem} {...props} />;
}

function SimpleSelect() {
  const classes = useStyles();
  const [values, setValues] = React.useState({
    age: ""
  });

  function handleChange(event) {
    setValues(oldValues => ({
      ...oldValues,
      [event.target.name]: event.target.value
    }));
  }

  return (
    <form className={classes.root} autoComplete="off">
      <FormControl className={classes.formControl}>
        <InputLabel htmlFor="age-simple">Age</InputLabel>
        <Select
          value={values.age}
          onChange={handleChange}
          inputProps={{
            name: "age",
            id: "age-simple"
          }}
        >
          <MenuItem value="">
            <em>None</em>
          </MenuItem>
          <MenuItem value={10}>Ten</MenuItem>
          <MenuItem value={20}>Twenty</MenuItem>
          <MenuItem value={30}>Thirty</MenuItem>
        </Select>
      </FormControl>
    </form>
  );
}

export default SimpleSelect;

如果您希望Select根据最宽菜单项的宽度动态调整宽度，则解决方案要复杂得多。