jQuery get id of element by searching for it by class

Answer 1

parentsUntil gets all the parent elements until the one matched by the selector. It does not include the element matched. You're trying to get the id of the intervening div, which is obviously undefined.

You need to use closest, which goes up the DOM tree until it finds an element matching the selector, then returns only that element:

var abc = $(this).closest(".head-div").attr("id");

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Edit: for extra speed, but less flexibility in the event that you change your markup, you could use the parentNode property:

var abc = this.parentNode.parentNode.id;