Answers for "document by class name"

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");

get element by class

var x = document.getElementsByClassName("example");
var i;
for (i = 0; i < x.length; i++) {
  x[i].style.backgroundColor = "red";
}

how to get element by class name javascript

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

get element by class name

var y = document.getElementsByClassName('foo');
var aNode = y[0];