Answers for "how to give attribute in javascript"

javascript add attribute

var element = document.getElementById('btnBuild');
element.setAttribute("disabled", "disabled");

attribute in javascript

elem.hasAttribute(name) //checks for existence.
elem.getAttribute(name) //gets the value.
elem.setAttribute(name, value) //sets the value.
elem.removeAttribute(name) //removes the attribute.
elem.attributes //collection of all attributes.

set attribute javascript

Element.setAttribute(name, value);