3.x Một ví dụ hoàn chỉnh về select Make create select Model (ok)

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C:\Users\Administrator\Desktop\pro\pages\index.tsx

import { Paper, Select, MenuItem, FormControl, InputLabel, makeStyles, Grid, createStyles } from '@material-ui/core';
import { Field, Form, Formik, FormikProps } from 'formik';
import { GetServerSideProps } from 'next';
import Make from '../interface/Make';
import Model from '../interface/Model';
import getMakes from './database/getMakes';
import getModels from './database/getModels';
import getAsString from '../getAsString';
import { useEffect, useState } from 'react';
import { useRouter } from 'next/router';
import useSWR from 'swr';
const useStyles = makeStyles((theme) => createStyles({
  paper: {
    margin: 'auto',
    maxWidth: 500,
    padding: theme.spacing(3),
  }
}));
interface HomeProps {
  makes: Make[],
  model: string
}
const prices = [500, 1000, 5000, 15000, 25000, 50000, 250000];
export interface ModelSelectProps extends SelectProps {
  name: string;
  models: Model[];
  make: string;
  initialMake: string;
}
export default function Home({makes}:HomeProps) {
  const classes = useStyles();
  const { query } = useRouter();
  const [initialValues] = useState({
    make: 'all',
    model: 'all',
    minPrice: 'all',
    maxPrice: 'all'
  });
  const ModelSelect = ({ initialMake, make, ...props }: ModelSelectProps) => {
  const { data: newModels } = useSWR < Model[] > ('/api/models?make=' + make, {
    dedupingInterval: 60000
  });
  if (!newModels) return <div>loading...</div>;
    return (
      <Field as={Select} labelId="model" label="Model" name="model">
        <MenuItem value='all'>Model</MenuItem>
        {
          newModels.map((model)=>(
            <MenuItem value={model.model} key={model.model}>{`${model.model} (${model.count})`}</MenuItem>
          ))
        }
      </Field>
    )
  }
  return (
    <Formik
      initialValues={initialValues}
      onSubmit={(value) => {
        return null;
      }}
    >
    {({values}) => (
      <Form className={classes.paper}>
        <Paper>
          <Grid container spacing={2}>
            <Grid item xs={6}>
              <FormControl fullWidth variant='outlined'>
                <InputLabel id="make">Make</InputLabel>
                <Field as={Select} labelId="make" label="Make" name="make">
                  {
                    makes?.map((make) => {
                      return <MenuItem key={make.make} value={make.make}>{make.make + " (" + make.count + " )"}</MenuItem>
                    })
                  }
                </Field>
              </FormControl>
            </Grid>
            <Grid item xs={6}>
              <ModelSelect initialMake={initialValues.make} name="model" make={values.make}/>
            </Grid>
            <Grid item xs={6}>
              <FormControl fullWidth variant='outlined'>
                <InputLabel id="minPrice">Min Price</InputLabel>
                <Field as={Select} labelId="minPrice" label="Min Price" name="minPrice">
                  {
                    prices?.map(price => {
                      return <MenuItem key={price} value={price}>{price}</MenuItem>
                    })
                  }
                </Field>
              </FormControl>
            </Grid>
            <Grid item xs={6}>
              <FormControl fullWidth variant='outlined'>
                <InputLabel id="maxPrice">Max Price</InputLabel>
                <Field as={Select} labelId="maxPrice" label="Max Price" name="maxPrice">
                  {
                    prices?.map(price => {
                      return <MenuItem key={price} value={price}>{price}</MenuItem>
                    })
                  }
                </Field>
              </FormControl>
            </Grid>
          </Grid>
        </Paper>
      </Form>  
    )}
    </Formik>
  )
}
export const getServerSideProps: GetServerSideProps = async () => {
  const [makes] = await Promise.all([getMakes()]);
  return {
    props: {makes}
  }
}