addclass and remove class javascript code example

Example 1: javascript remoev css class

//remove a css class from an element
document.getElementById("myElementID").classList.remove("class_name");

Example 2: javascript add class to element

var someElement= document.getElementById("myElement");
    someElement.className += " newclass";//add "newclass" to element (space in front is important)

Example 3: how to remove an class in javascript

document.getElementsByClassName("legend").style.display="none";