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