Populate one hidden form field with multiple checkbox answers using jQuery

populatefieldwithmultiplecheckboxanswers.js

$('.customCheckboxesRow').each(function(){						
	var checkboxVal = '';
	var checkboxel = $(this).find('.checkbox');
	// checks if checkbox was selected, if so, adds rel attribute value of each checkbox to checkboxVal variable
	checkboxel.each(function(){
		if ($(this).hasClass('checkActive')){
			var selectedRel = $(this).attr("rel");
			checkboxVal += selectedRel + ', ';
		}
	});
	checkboxVal = checkboxVal.slice(0, -2); //removes trailing comma
	$(this).children('input').val(checkboxVal);
});

thanks for sharing Matt. Try this:

$('.customCheckboxesRow').each(function(){
var compiled_rel = $(".checkbox.checkActive[rel]", $(this)).map(function() {
return $(this).attr("rel");
}).get().join(", ");

$("[type=hidden]", $(this)).val(compiled_rel);
});