![]() Note: Assigning a class name directly to the className property will overwrite the existing classes. To add a new class to the element assign the new class to the element's className property as a string. The className property can read as well as write the classes of the element. Paragraph 1Ĭonst element1 = document.getElementById("id1") Ĭonst element2 = document.getElementById("id2") Ĭonsole.log(element1.className) // "box"Ĭonsole.log(element2.className) // "big red box" If element has a class named class1 then it returns "class1", if element has 2 classes class1 and class2 then it returns "class1 class2", and so on. The className property returns the classes of the element in form of a string. The className property of an element can be used to get and set classes attached to the element. Use the add() method to add the class and pass the class name as an argument.To add a CSS class using javascript follow the steps below: The DOMTokenList is read-only but it provides add() methods to add classes to the element. The classList property of the HTML element returns a live representation of the element's class attribute known as DOMTokenList. ![]() There are 3 ways to add CSS class using javascript. To add dynamic CSS to an element add a class to the element. While working on the front-end, we often need to add CSS dynamically to an HTML element.
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