Answers for "how to change an attribute value in javascript"

javascript update attribute

var element = document.getElementById("elemId");
element.setAttribute("attributeName", "value");

javascript setattribute

element.setAttribute(<name>, <value>);
// ex
var aElement = document.querySelector("a"); 
aElement.setAttribute("href", "https://isitchristmas.com/"); 
// same as <a href="https://isitchristmas.com/"></a>

set attribute javascript

Element.setAttribute(name, value);

set attribute in javascript

//Fetch id from html
var a = document.getElementById("id");

//variable.setAttribute("Attributes","Properties:Values")
a.setAttribute("style", "visibility:hidden;");