When to use setAttribute vs .attribute= in JavaScr

Question

Has a best-practice around using setAttribute instead of the dot (.) attribute notation been developed?

E.g.:

myObj.setAttribute("className", "nameOfClass");
myObj.setAttribute("id", "someID");

or

myObj.className = "nameOfClass";
myObj.id = "someID";

Answer 1

One case I found where setAttribute is necessary is when changing ARIA attributes, since there are no corresponding properties. For example

x.setAttribute('aria-label', 'Test');
x.getAttribute('aria-label');

There's no x.arialabel or anything like that, so you have to use setAttribute.

Edit: x["aria-label"] does not work. You really do need setAttribute.

x.getAttribute('aria-label')
null
x["aria-label"] = "Test"
"Test"
x.getAttribute('aria-label')
null
x.setAttribute('aria-label', 'Test2')
undefined
x["aria-label"]
"Test"
x.getAttribute('aria-label')
"Test2"