Answers for "get value by class name in javascript"

javascript get element by class

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

get element by class

var elements = document.getElementsByClassName(names); // or:
var elements = rootElement.getElementsByClassName(names);

javascript get element by class

var elements = document.querySelector(".class");

how to get element by class name javascript

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