How to create an event in JavaScript?

What is an Event?

In this article, we can try to show an example of a JavaScript Event function like Click Event and show how to create an event in JavaScript. JavaScript’s interaction with HTML is handled through events that occur when the user or browser navigates a page.

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Firstly, when the page loads, it is called an event. When the user clicks a button, that is also a click event. JavaScript has so many events like pressing any key, resizing a window, closing a window, etc.

Hence, the Most Developers can use these events to execute JavaScript-coded responses, which cause buttons to close windows, data to be validated, messages to be displayed to users, and virtually any other type of response imaginable.

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How to create an event in JavaScript

Secondly, The Events are a part of the Document Object Model (DOM) Level 3 and every HTML element contains a set of events that can trigger JavaScript Code.

So, go through this small article for a better understanding of HTML Event Reference. Here we will see an example to understand the relationship between Event and JavaScript.

What are events used for in JavaScript?

Events are fired inside the browser window and are attached to a specific item in it. This might be a single element, the HTML document loaded in the current tab, a set of elements, or the entire browser window.

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There are many different types of we can discuss a CLICK EVENT for now.

onclick Event Type

Therefore, the most frequently used event type occurs when a user clicks the left button of his mouse and you can put your validation, warning, etc., against this event type.

Example

Try the following example:

<!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">
    <link href="https://cdn.jsdelivr.net/npm/[email protected]/dist/css/bootstrap.min.css" rel="stylesheet" integrity="sha384-rbsA2VBKQhggwzxH7pPCaAqO46MgnOM80zW1RWuH61DGLwZJEdK2Kadq2F9CUG65" crossorigin="anonymous">

    <title>Variables and Event Example</title>
    <style>
        img{}
        img:hover{cursor: pointer;}
    </style>
</head>
<body>
    <header style="background: #f1f1f1;border-bottom:1px solid #ccc;">
        <div class="container text-center">
            <h2>Variables and Event Example</h2>
        </div>
    </header>
    <section class="content-area" style="margin: 30px auto;">
        <div class="container">
            <div class="row">
                <div class="col-md-2"></div>
                <div class="col-md-8">
                    <img class="img-fluid" id="large-image" src="homework_images/gallery-1.jpg"/>
                </div>
               <div class="col-md-2"></div>
           </div>
            <div class="row">
                <div class="col-md-2"></div>
               <div class="col-md-2">
                    <img class="img-fluid thumbnail1" src="homework_images/gallery-2.jpg"/>
                </div>
                <div class="col-md-2">
                    <img class="img-fluid thumbnail2" src="homework_images/gallery-1.jpg"/>
                </div>
                <div class="col-md-2">
                    <img class="img-fluid thumbnail3" src="homework_images/gallery-3.jpg"/>
                </div>
                <div class="col-md-2">
                    <img class="img-fluid thumbnail4" src="homework_images/gallery-4.jpg"/>
                </div>
                <div class="col-md-2"></div>
           </div>
            <script>
                  let thum1=document.querySelector(".thumbnail1");
                  thum1.addEventListener("click", function(){
                      let src=this.getAttribute("src");
                      let largeImage=document.querySelector("#large-image");

                      largeImage.setAttribute("src",src);
                  })
                 let thum2=document.querySelector(".thumbnail2");
                  thum2.addEventListener("click", function(){
                      let src=this.getAttribute("src");
                      let largeImage=document.querySelector("#large-image");

                     largeImage.setAttribute("src",src);
                  })
                  let thum3=document.querySelector(".thumbnail3");
                  thum3.addEventListener("click", function(){
                     let src=this.getAttribute("src");
                      let largeImage=document.querySelector("#large-image");

                     largeImage.setAttribute("src",src);
                  })
                 let thum4=document.querySelector(".thumbnail4");
                  thum4.addEventListener("click", function(){
                      let src=this.getAttribute("src");
                      let largeImage=document.querySelector("#large-image");

                      largeImage.setAttribute("src",src);
                  })
             </script>
        </div>
    </section>
    <footer class="footer" style="background: #f1f1f1;border-top:1px solid #ccc;padding:15px 0px;">
        <div class="container text-center">Copyright @ Akhtaruzzaman</div>
    </footer>


</body>
</html>

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JavaScript Events Example