A gist which contains secrets of Javascaript, jQuery and the family.

js-hikes.js

	$('.add-new-payment').on('click', function(){
		var received_amount = $('.payment-detail-row:last').find('.received_amount_input').val();
		var remaining_amount = $('.payment-detail-row:last').find('.remaining_amount_input').val();
		var receiving_date = $('.payment-detail-row:last').find('.mydatepicker').val();

		if(
			received_amount == '' || received_amount == null ||
			remaining_amount == '' || remaining_amount == null ||
			receiving_date == '' || receiving_date == null
		){
      // below two lines are not working for some reason
      // let's find out :D
			$('.payment-detail-row:last').find('.mydatepicker').css({opacity: 0});
		  $('.payment-detail-row:last').find('.mydatepicker').animate({opacity: 1}, 700 );
			alert('Please fill the last added payment detail entry.');
			return false;
		}
	});