In this example here, I have explained how to get elements by the class name using plain JavaScript The classList property is used to add, remove, and toggle CSS classes on an element.. Next, we created an image tag with src and alt attributes.. We also created the h2 tag and added text content in it. As I explained in a previous article, one of the benefits of JavaScript is that it can randomly traverse the DOM, making it easy for an element anywhere on a web page to respond to a click in another, unrelated of the document. And it sets the font style to italic. It is a template for JavaScript objects. How to add a class to DOM element in JavaScript? The appearance of HTML content is still under the purview of CSS, meaning that we must integrate the technologies together to create a cohesive whole. To add a class to a DOM element, you first need to find it using a querySelector like querySelector, getElementById, etc. For example, if you have the following HTML − As you can see, it’s pretty simple stuff! Using a Class ... Use the keyword class to create a class. The JavaScript getElementByClassName() is a dom method to allows you to select an element by its class name. For example, the event could be created as follows: const event = new CustomEvent ('build', {detail: elem. Then you need to add the class. The problem with this code is that the href becomes a link to a page called showSignature(xyz) and not a javascript function call to the function showSignature() with parameter xyz. The private variables, and functions are defined with the keyword "var". dataset. It sets the font weight to bold. The following syntax represents the getElementByClassName() method: let elements = document.getElementsByClassName(classNames) let elements = parentElement.getElementsByClassName(classNames) Javascript Front End Technology Object Oriented Programming. In our index.js, we used document.createElement() to dynamically create a new div.Then, we added a dog class to the div we created earlier.. That’s great, as HTML dictionary is rich, but not infinite. Once a custom element is defined, we can use it on par with built-in HTML elements. In the snippet above, we created a CSS class called “newClass“. DOM Intro DOM Methods DOM Document DOM Elements DOM HTML DOM CSS DOM Animations DOM Events DOM Event Listener DOM Navigation DOM Nodes DOM Collections DOM Node Lists ... A JavaScript class is not an object. A class in JavaScript is created with the special word: function, using this syntax: className = function() { // code of the className class } A class can contain public and private variables (called also properties) and functions (also called methods). This will then allow you to access the additional data in the event listener: The HTML element. We can create custom HTML elements, described by our class, with its own methods and properties, events and so on. The following example finds the first element with the menu-item class: let note = document .querySelector( '.menu-item' ); Code language: JavaScript ( javascript ) Always add a constructor() method. Wrap the classes name by " instead of ' and remove div.html("test");.It says replace html of selected element by test it means it removes .inner_dialog_red_top_page and replace it by test.. Jsfiddle Now, let’s create an example HTML element: This class does three things: It sets the color of the element’s text to red. 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