Answers for "select all child elements with specific class javascript"

get all the child of the same class javascript

var doc = document.getElementById("test");
var notes = null;
for (var i = 0; i < doc.childNodes.length; i++) {
    if (doc.childNodes[i].className == "4") {
      notes = doc.childNodes[i];
      break;
    }        
}

get all child element of class javascript

var parent = document.getElementById('test');
var children = parent.getElementsByClassName('four');