promises_JOKES.HTML

<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Jokes</title>
    <style>
        body {
            background-color: black;
            display: flex;
            flex-direction: column;
            justify-content: center;
            align-items: center;
            height: 100%;
            width: 100%;
        }

        .joke {
            width: 20vw;
            height: 5vw;
            margin-bottom: 2vw;
            color: black;
            background-color: white;
        }

        #btn {
            color: black;
        }

        * {
            color: white;
        }
    </style>
</head>

<body>
    <div>
        <h3>Joke :</h3>
        <div class="joke" id="joke">Joke is loading...</div>
        <button id="btn">next</button>
    </div>



    <script>
        // promises: 
        // fetch(/*link of api*/); // returns the promise.

        // 90% we will consume promise, in advance we create promise.
        const joke = document.querySelector("#joke");
        const jokeBtn = document.querySelector("#btn");

        const generateJoke = () => {
            // then and catch runs like try and catch.

            const setHeader = () => {
                Accept: "application/json";
            };

            fetch('https://icanhazdadjoke.com', setHeader)
                .then((response) => {
                    // response in html format, we nned to convert to JSON form.
                    response.json();
                })
                .then((data) => {
                    joke.innerHTML = data.joke;
                })
                .catch((error) => {
                    alert("API error!!!!......");
                })
        };

        jokeBtn.addEventListener('click', generateJoke);
        generateJoke();
    </script>
</body>

</html>