getElementby classname code example

Example 1: javascript get element by class

var elementsArray = document.getElementsByClassName("someclassname");

Example 2: js add class

var element = document.getElementById('element');
element.classList.add('class-1');
element.classList.add('class-2', 'class-3');
element.classList.remove('class-3');

Example 3: how to get element by class name javascript

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

Example 4: javascript get element by class

const whiteBoxes = document.getElementsByClassName("box-white")