4.3 Next.js Building a Car Trader App #4- Model - Dynamic Dropdown using Formik and SWR

Sử dụng query của useRouter để lấy giá trị tham số trên đường đẫn :)))

http://localhost:3000/?make=Audi&model=1&minPrice=500&maxPrice=500localhost

import React, { useState, useEffect } from 'react';
import { Paper, Select, MenuItem, FormControl, InputLabel, makeStyles, Grid, Button } from '@material-ui/core';
import { Field, Form, Formik, FormikProps, useField, useFormikContext } from 'formik';
import { GetServerSideProps } from 'next';
import router, { useRouter } from 'next/router';
import useSWR from 'swr';
import { getMakes, Make } from './database/getMakes';
import { getModels, Model } from './database/getModels';
import { getAsString } from '../getAsString';
interface HomeProps {
  makes: Make[],
    models: Model[],
}
const useStyles = makeStyles((theme) => ({
  paper: {
    margin: 'auto',
    maxWidth: 500,
    padding: theme.spacing(3),
  }
}));
const ModelSelect = ({ make, ...props }) => {
  const { data: newModels } = useSWR < Model[] > ('/api/models?make=' + make);
  if (!newModels) return 'loading...';
  return (
    <Field as={Select} labelId="model" label="Model" name="model">
      <MenuItem value='all'>Model</MenuItem>
      {
        newModels.map((model)=>(
          <MenuItem value={model.count} key={model.model}>{`${model.model} (${model.count})`}</MenuItem>
        ))
      }
    </Field>
  )
}
const prices = [500, 1000, 5000, 15000, 25000, 50000, 250000];
export default function Home({ makes, models }: HomeProps) {
  const classes = useStyles();
  const { query } = useRouter();
  const [initialValues] = useState({
    make: getAsString(query.make) || 'all',
    model: getAsString(query.model) || 'all',
    minPrice: getAsString(query.minPrice) || 'all',
    maxPrice: getAsString(query.maxPrice) || 'all',
  });
  return (
    <Formik
      initialValues={initialValues}
      onSubmit={(values) => {
        router.push({
          pathname: '/cars',
          query: { ...values, page: 1 }
        })
      }}
    >
    {({values}) => (
      <Form 
        className={classes.paper} 
        variant="outlined"
      >
        <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">
                  <MenuItem value='all'>All Make</MenuItem>
                  {
                    makes.map((make)=>(
                      <MenuItem value={make.make} key={make.make}>{`${make.make} (${make.count})`}</MenuItem>
                    ))
                  }
                </Field>
              </FormControl>
            </Grid>
            <Grid item xs={6}>
              <FormControl fullWidth variant='outlined'>
                <InputLabel id="model">Model</InputLabel>
                <ModelSelect models={models} name="model" make={values.make} />
              </FormControl>
            </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">
                <MenuItem value='all'>No Min</MenuItem>
                {
                  prices.map((price)=> (
                    <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">
                  <MenuItem value='all'>No Max</MenuItem>
                  {
                    prices.map((price)=> (
                      <MenuItem key={price} value={price}>{price}</MenuItem>
                    ))
                  }
                </Field>
              </FormControl>
            </Grid>
            <Grid item xs={12}>
              <Button type="submit" variant="contained" color="primary" fullWidth>Search</Button>
            </Grid>
          </Grid>
        </Paper>
      </Form>  
    )}
    </Formik>
  )
}
export const getServerSideProps: GetServerSideProps = async (ctx) => {
  const { make } = ctx.query;
  const [makes, models] = await Promise.all([getMakes(), getModels(make)]);
  return {
    props: { makes, models }
  }
}