When should I use return false in jquery function?

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According to jQuery Events: Stop (Mis)Using Return False (archived link), returning false performs three tasks when called:

  1. event.preventDefault();
  2. event.stopPropagation();
  3. Stops callback execution and returns immediately when called.

The only action needed to cancel the default behaviour is preventDefault(). Issuing return false; can create brittle code. Usually you’d want just this:

$("a").on( 'click', function (e) {
    // e == our event data
    e.preventDefault();
});

And secondly “this” is a DOM element in javascript and “$(this)” is a jQuery element
that references the DOM element. Read more on the topic at jQuery’s this: demystified.

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