async-js/3.html at main · asity-tech/async-js · GitHub

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<html lang="en">
  <head>
    <link rel="stylesheet" href="css/style.css" />
    <title>1</title>
  </head>
  <body>
    <main>
      <h1>3.html</h1>
      <h1>using json data</h1>
      <p>JSON - javascript object notation</p>
      <h1>console main chalo</h1>
      <div class="container">
        <a href="index.html">home</a>
        <a href="1.html">1</a>
        <a href="2.html">2</a>
        <a href="3.html">3</a>
        <a href="4.html">4</a>
        <a href="5.html">5</a>
        <a href="6.html">6</a>
        <a href="7.html">7</a>
        <a href="8.html">8</a>
        <a href="asyncAwait.html">asyncAwait</a>
        <a href="fetchAPI.html">fetchAPI</a>
        <a href="placeholderAPI.html">placeholderAPI</a>
        <a href="unsplashAPI.html">unsplashAPI</a>
        <a href="weatherAPI.html">weatherAPI</a>
      </div>
    </main>
    <script>
      const getTodos = (callback) => {
        const request = new XMLHttpRequest();

        request.addEventListener("readystatechange", () => {
          if (request.readyState === 4 && request.status === 200) {
            const data = JSON.parse(request.responseText);
            callback(undefined, data);
          } else if (request.readyState === 4 && request.status === 404) {
            callback("could not fetch any data", undefined);
          }
        });

        request.open("GET", "https://jsonplaceholder.typicode.com/todos");
        request.send();
      };

      getTodos((err, data) => {
        console.log("callback fired");
        if (err) {
          console.log(err);
        } else {
          console.log(data);
        }
      });
    </script>
  </body>
</html>