js get id value

var element = document.getElementById("YourElementId");

document.getElementById("IdGoesHere");

document.getElementById("YourElementId");

var element = document.getElementById("YourElementId");
var value_element = document.getElementById("YourElementId").value;

var myElement=document.getElementById("someElementID");

var element = document.getElementsByTagName("div")[0];
var id = element.id;