Hedera.Ticket = new Class ({ Extends: Hedera.Form ,onPrintClick: function (event) { var batch = new Sql.Batch (); batch.addValue ('ticket', this.$('ticket-id').value); this.gui.openReport ('delivery-note', batch); } ,subtotalRenderer: function (column, form) { column.value = this.subtotal (form); } ,repeaterFunc: function (res, form) { res.$('subtotal').value = this.subtotal (form); } ,subtotal: function (form) { var price = form.get ('price'); var discount = form.get ('discount'); if (price && form.get ('fixed')) return form.get ('amount') * price * ((100 - discount) / 100); else return null; } });