Check a radio button with javascript

Question

For some reason, I can\'t seem to figure this out.

I have some radio buttons in my html which toggles categories:

Answer 1

If you want to set the "1234" button, you need to use its "id":

document.getElementById("_1234").checked = true;

When you're using the browser API ("getElementById"), you don't use selector syntax; you just pass the actual "id" value you're looking for. You use selector syntax with jQuery or .querySelector() and .querySelectorAll().