Nov 28, 2016 · To add an additional class to an element: To add a class to an element, without removing/affecting existing values, append a space and the new classname, like so: document.getElementById("MyElement").className += " MyClass"; To change all classes for an element: To replace all existing classes with one or more new classes, set the className ...

Jul 12, 2009 · 3 ways to add a class to a DOM element in JavaScript. There are multiple ways of doing this. I will show you three ways to add classes and clarify some benefits of each way. You can use any given method to add a class to your element, another way to …

Jul 12, 2012 · javascript add class to an element in a specific div. 0. Add css class on div. 1. need to add a class to ...

Whilst some people consider it overkill to add a ~50 KB framework for simply changing a class, if you are doing any substantial amount of JavaScript work or anything that might have unusual cross-browser behavior, it is well worth considering.

One way to play around with classes without frameworks/libraries would be using the property Element.className, which "gets and sets the value of the class attribute of the specified element." (from the MDN documentation).

Aug 17, 2016 · When an element already has a class name defined, its influence on the element is tied to its position in the string of class names. Later classes override earlier ones, if there is a conflict. Adding a class to an element ought to move the class name to the sharp end of the list, if it exists already.

May 12, 2020 · "document.getElementsByClassName('form-control')" that gives you a node list of all the inputs with that class, and in your case you need just the first so it should be let element = document.getElementsByClassName('form-control')[0], or you can use the .querySelector() example let element = document.querySelector(".form-control"), note that .querySelector() select elements by css selectors ...

As we add the same CSS properties to different elements by separating them by a comma in the same way we can select those elements using this. .even, .odd { font-weight: bold; } Both elements with class 'even' and 'odd' get bold.

Nov 4, 2014 · What is also very helpful in many situations, if you are adding or removing a class name based on a condition, you can pass that condition as a second argument. If that argument is truthy, toggle acts as add, if it's falsy, it acts as though you called remove. element.classList.toggle(className, condition) // add if condition truthy, otherwise ...

Dec 20, 2012 · @aebersold I agree that jQuery is easy to learn and use, but at 50K to download (plus an additional request) just to add a class, it's a bit of overkill IMHO. – David Hoerster Commented Dec 20, 2012 at 22:19