javascript - 更改 Material UI 的颜色选择组件边框不起作用

Question

我正在使用 material-ui v5 进行学习。我在覆盖 mui Select 组件的默认样式时遇到困难。我想在将鼠标悬停在它上面并且处于聚焦状态时更改 Select 的颜色。目前，聚焦状态的颜色是这样的。

这是我的代码:

import { useState, useEffect } from 'react';
import { makeStyles } from '@mui/styles';
import { Select, MenuItem } from '@mui/material';

const useStyles = makeStyles({
    select: {
     '&.MuiOutlinedInput-root': {
       width: '200px'
     },
    '& .MuiOutlinedInput-notchedOutline': {
        borderColor: 'red',
          '&:hover': {
          borderColor: 'green'
        }
     },

    }
})

function App() {
  const classes = useStyles();
  const [age, setAge] = useState('');

  const handleChange = (event: SelectChangeEvent) => {
    setAge(event.target.value);
  };
  return (
        <Select
          variant="outlined"
          className={classes.select}
          labelId="demo-simple-select-label"
          id="demo-simple-select"
          value={age}
          label="Age"
          onChange={handleChange}
        >
          <MenuItem value={10}>Ten</MenuItem>
          <MenuItem value={20}>Twenty</MenuItem>
          <MenuItem value={30}>Thirty</MenuItem>
        </Select>
  );
}

export default App;

如有任何帮助，我们将不胜感激。

Answer 1

首先:

@mui/styles is the legacy styling solution for MUI. It depends on JSS as a styling solution, which is not used in the @mui/material anymore, deprecated in v5. If you don't want to have both emotion & JSS in your bundle, please refer to the @mui/system documentation which is the recommended alternative.

更多可以查看here .所以对于定制，你应该选择 styled-components .

MUI 中的

Select 组件使用其背后的输入字段，要完成您需要自定义input 的操作，这就是为什么您正在使用 .MuiOutlinedInput-root 类。因此，MUI 有一些 input 自定义示例 here .

这是一个自定义的Select 示例:

const CustomSelect = styled(Select)(() => ({
  width: 300,
  "&.MuiOutlinedInput-root": {
    "& fieldset": {
      borderColor: "red"
    },
    "&:hover fieldset": {
      borderColor: "yellow"
    },
    "&.Mui-focused fieldset": {
      borderColor: "green"
    }
  }
}));