add property to html element javascript code example

Example 1: javascript change attribute

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

Example 2: set attribute javascript

Element.setAttribute(name, value);

Example 3: add property with value in js

var myObject = {
    sProp: 'some string value',
    numProp: 2,
    bProp: false
};