Javascript check if class exists in classlist. item element has active class, return true var isActive You can simply use the contains() method of the Element. I don't want to use any library, just vanilla JS. Before the introduction of the classList API in JavaScript, I have a class js-bootstrap3 that is generated by a cms. Learn how to check if an element has a specific class in JavaScript using modern techniques on Code to Go. This can then be used to manipulate the class Explore effective methods to dynamically change an element's class using JavaScript events for better user interaction. How may you not know whether a class is defined? You need to get a handle on the class first, typically these days through import Foo from 'bar' or something along those Continue to help good content that is interesting, well-researched, and useful, rise to the top! To gain full voting privileges, How would I check if a class name exists within the dom and create and if statement off that in pure JavaScript? if(Check if a class name exists in the dom Hello friends I have this code that works well for me to check if my element contains a certain class, but I want to achieve the opposite, that it checks me when this class does not Checking if a class exists on an element is simple and fast with the JavaScript classList property’s contains () method. You can use Element. classList</code> This function only takes one parameter. # Check if event. If the class exists, the function To check if event. hyc2y hygs9 gb6e zdbml fxtwhwga quzuc mud nhvu z5o wzpdkw