javascript html attribute code example

Example 1: javascript get attribute

//HTML
//<div id="elem" data-id="4hJ3s"></div>

var elem = document.getElementById("elem");
elem.getAttribute("data-id"); // "4hJ3s"

Example 2: javascript change attribute

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

Example 3: set attribute javascript

Element.setAttribute(name, value);