React

by jgarrido

HTML

<div id="app"></div>

CSS

body {
  background: #20262E;
  padding: 20px;
  font-family: Helvetica;
}

#app {
  background: #fff;
  border-radius: 4px;
  padding: 20px;
  transition: all 0.2s;
}

li {
  margin: 8px 0;
}

h2 {
  font-weight: bold;
  margin-bottom: 15px;
}

.done {
  color: rgba(0, 0, 0, 0.3);
  text-decoration: line-through;
}

input {
  margin-right: 5px;
}

React

import React, { useState, useEffect } from 'react';

const MyComponent = () => {
  const [value, setValue] = useState(null);
  const [isLoading, setIsLoading] = useState(true);

  useEffect(() => {
    // Simulate an async operation (e.g., fetching data from an API)
    const fetchData = async () => {
      try {
        const response = await fetch('https://api.example.com/data');
        const data = await response.json();
        setValue(data);
        setIsLoading(false);
      } catch (error) {
        console.error('Error fetching data:', error);
        setIsLoading(false); // Even on error, we should stop loading
      }
    };

    fetchData();
  }, []); // Empty dependency array means this effect runs once after the initial render

  if (isLoading) {
    return <div>Loading...</div>; // Render a loading state
  }

  return (
    <div>
      <h1>Data Loaded</h1>
      <p>{value}</p>
    </div>
  );
};

export default MyComponent;