warn user if all checkboxes are unchecked

Question

I have a form with a series of checkboxes. I want to warn the user, after they hit submit, if ALL of the checkboxes are unchecked. I\'m using the following code to report all

Answer 1

You can use jQuery object's length property:

$("#set_pref_submit").click(function() {
    var legchecked = $('input[id^=leg_rider]:checked').length;
    if (legchecked){ alert("no riders")};
});