使用 Next.js 和 SWR 在按钮点击时触发数据请求

import useSWR from 'swr';
import { useState } from 'react';

const fetcher = async (url) => {
  const res = await fetch(url);
  if (!res.ok) {
    const error = new Error('An error occurred while fetching the data.');
    error.info = await res.json();
    error.status = res.status;
    throw error;
  }
  return res.json();
};

function MyComponent() {
  const [shouldFetch, setShouldFetch] = useState(false);

  const { data, error, isLoading } = useSWR(
    shouldFetch ? '/api/data' : null, // 当 shouldFetch 为 true 时才发起请求
    fetcher
  );

  const handleClick = () => {
    setShouldFetch(true); // 点击按钮时将 shouldFetch 设置为 true
  };

  if (error) return <div>Failed to load: {error.message}</div>;
  if (isLoading) return <div>Loading...</div>;

  return (
    <div>
      <button onClick={handleClick}>Fetch Data</button>
      {data && <div>Data: {JSON.stringify(data)}</div>}
    </div>
  );
}

export default MyComponent;

import { useState } from 'react';

function MyComponent() {
  const [data, setData] = useState(null);
  const [isLoading, setIsLoading] = useState(false);
  const [error, setError] = useState(null);

  const handleClick = async () => {
    setIsLoading(true);
    try {
      const res = await fetch('/api/data');
      if (!res.ok) {
        throw new Error('Failed to fetch data');
      }
      const jsonData = await res.json();
      setData(jsonData);
      setError(null);
    } catch (err) {
      setError(err);
      setData(null);
    } finally {
      setIsLoading(false);
    }
  };

  if (error) return <div>Failed to load: {error.message}</div>;
  if (isLoading) return <div>Loading...</div>;

  return (
    <div>
      <button onClick={handleClick}>Fetch Data</button>
      {data && <div>Data: {JSON.stringify(data)}</div>}
    </div>
  );
}

export default MyComponent;