September 25, 2021

How to Create Element in Javascript

By Krishnaa JavaScript Questions 0 Comments

In this tutorial, you will learn how to create element in javascript. If you are a newbie, then you might face trouble in creating an element and then adding that element to the DOM. However, we do have certain methods to accomplish such things but everything should be done in the right sequence.

The createElement() and createTextNode() methods can take care of creating an element and creating a text code node for it. The appendChild() method will be enough to add it to the DOM if you are expecting your newly created element to be a child of an existing element.

However, we are also going to cover the insertBefore() method to add our newly created element just before an existing element. In the following example, we have a couple of elements. Upon click of a button, we will dynamically create an element and add it to the DOM. Please have a look over the code example and the steps given below.

HTML & CSS

We have 3 elements in the HTML file (div, button, and p). The div element is just a wrapper for the paragraph element.
The inner text for the button element is “Create”.
We have some random text in the paragraph element.
We have done some basic styling using CSS and added the link to our style.css stylesheet inside the head element.
We have also included our javascript file script.js with a script tag at the bottom.

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <link rel="stylesheet" href="style.css">
    <title>Document</title>
</head>
<body>
    
    <button>Create</button>
    <div class="container">
        <p>Lorem ipsum dolor sit amet consectetur adipisicing elit. Consectetur exercitationem labore saepe facilis placeat sunt quam laudantium illo dignissimos voluptates ipsa odio reprehenderit, atque maiores culpa necessitatibus, ipsam delectus? Aliquam.</p>
    </div>

    <script src="script.js"></script>
</body>
</html>

.container {
    border: 1px solid black;
    padding: 10px;
    margin-top: 10px;
}

Javascript

We have selected 2 elements button and div using the document.querySelector() method and stored them in btnCreate and parentElement variables respectively.
We have attached the click event listener to the button element.
In the event handler function, we are creating an h1 element using the createElement() method and storing it in the element variable.
We need some text content in the h1 element and that is why we are using the createTextNode() method. We are storing the text node in the elementContent variable.
We are using the appendChild() method to add text content to our newly created h1 element.
We can add our newly created element at 4 different locations.
To add after paragraph element, we are using the appendChild() method of div element and passing our new element as a parameter.
To add before paragraph element, we are using the insertBefore() method of div element and passing our new element and the paragraph element as a parameter.
To add before div element, we are selecting body element and calling insertBefore() method. We are passing our new element and the div element as a parameter.
To add after div element, we are selecting body element and calling insertBefore() method. As a parameter, we are passing our new element and the next sibling of the div element. The nextElementSibling property returns the element immediately following the specified element, in the same tree level.

let btnCreate = document.querySelector('button');
let parentElement = document.querySelector('.container');

btnCreate.addEventListener('click', () =>{
    let element = document.createElement('h1');
    let elementContent = document.createTextNode('Hello World');
    element.appendChild(elementContent);
    // parentElement.appendChild(element);
    // parentElement.insertBefore(element, document.querySelector('p'));
    // document.querySelector('body').insertBefore(element, parentElement);

    document.querySelector('body').insertBefore(element, parentElement.nextElementSibling);
});

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