this . classlist.add code example
Example: add to classlist javascript
Add multiple classes to a element:
document.getElementById("myDIV").classList.add("mystyle", "anotherClass", "thirdClass");
Remove a class from a
element:
document.getElementById("myDIV").classList.remove("mystyle");
Remove multiple classes from a
element:
document.getElementById("myDIV").classList.remove("mystyle", "anotherClass", "thirdClass");
Toggle between two classes for a
element:
document.getElementById("myDIV").classList.toggle("newClassName");
Find out if an element has a "mystyle" class:
document.getElementById("myDIV").classList.contains("mystyle");