JavaScript-Bacics/events.html at master · sanchithaudana/JavaScript-Bacics · GitHub

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<!DOCTYPE html>
<html lang="en">

<head>
    <title>Events</title>
    <link href="https://cdn.jsdelivr.net/npm/bootstrap@5.0.2/dist/css/bootstrap.min.css" rel="stylesheet"
        integrity="sha384-EVSTQN3/azprG1Anm3QDgpJLIm9Nao0Yz1ztcQTwFspd3yD65VohhpuuCOmLASjC" crossorigin="anonymous">
</head>

<body>

    <div class="container d-flex justify-content-center">
        <div class="raw">
            <div class="col">

                <button onclick="alert('button 01 was cliked')" class="btn btn-primary">Button 01</button>
                <button id="button2" class="btn btn-danger">Button 02</button>
                <button id="button3" class="btn btn-warning">Button 03</button>
                <button id="button4" class="btn btn-secondary">Button 04</button>

            </div>
        </div>
    </div>

    <script>

        //                                          Events
        //                                          ------

        // Have Two type of Events in javascript
        // we called that listlen to Events

        // 01. using HTML Elements
        // ex - <a onclick="doSomething()"> </a>

        // 02. using addEventListener("event", function());
        // element.addEventsListener("click", doSomething());

        // Example events :
        // * - click
        // * - mouseover
        // * - keyup
        // * - keydown
        // * - change

        // background keyboard detect

        document.addEventListener("keyup", function (event) {
            console.log(event.keyCode, event.key);
        })

        // button 02
        var mybtn2 = document.getElementById("button2");
        mybtn2.addEventListener("click", doSomething);

        function doSomething(event) {
            console.log(event);
        }

        // button 03
        var mybtn3 = document.getElementById("button3");
        mybtn3.addEventListener("click", showButton3);

        function showButton3() {
            console.log("button 3 clicked");
        }

        // button 04
        var mybtn4 = document.getElementById("button4");
        mybtn4.addEventListener("click", showButton4);

        function showButton4() {
            console.log("button 4 clicked");
        }


    </script>

</body>

</html>