Wednesday, August 22, 2018
javascript - How do I add a class to a given element?
Answer
Answer
I have an element that already has a class:
![]()
Now I want to create a JavaScript function that will add a class to the div
(not replace, but add).
How can I do that?
Answer
Add a space plus the name of your new class to the className
property of the element. First, put an id
on the element so you can easily get a reference.
![]()
Then
var d = document.getElementById("div1");
d.className += " otherclass";
Note the space before otherclass
. It's important to include the space otherwise it compromises existing classes that come before it in the class list.
See also element.className on MDN.
Use element.classList.add to add a class:
element.classList.add("my-class");
And element.classList.remove to remove a class:
element.classList.remove("my-class");
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