Live Demo: Example of jQuery Fade-In and Fade-Out Effects with Callback

<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8">
<title>Example of jQuery Fade-In and Fade-Out Effects with Callback</title>
<script src="https://code.jquery.com/jquery-3.5.1.min.js"></script>
<style>
    p{
        padding: 15px;
        background: #DDA0DD;
    }
</style>
<script>
$(document).ready(function(){
    // Display alert message after fading out paragraphs
    $(".out-btn").click(function(){
        $("p").fadeOut("slow", function(){
            // Code to be executed
            alert("The fade-out effect is completed.");
        });
    });
    
    // Display alert message after fading in paragraphs
    $(".in-btn").click(function(){
        $("p").fadeIn("slow", function(){
            // Code to be executed
            alert("The fade-in effect is completed.");
        });
    });
});
</script>
</head>
<body>
    <button type="button" class="out-btn">Fade Out Paragraphs</button>
    <button type="button" class="in-btn">Fade In Paragraphs</button>
    <p>This is a paragraph.</p>
</body>
</html>