rental_transaction.js

function toggle_fields(frm) {
        frm.toggle_reqd("customer", frm.doc.transaction_type == "Rent");
        frm.toggle_reqd("deposit_amount", frm.doc.transaction_type == "Rent");
        frm.toggle_display("customer", frm.doc.transaction_type == "Rent");
        frm.toggle_display("deposit_amount", frm.doc.transaction_type == "Rent");

        frm.toggle_reqd("tenant", frm.doc.transaction_type == "Vacate");
        frm.toggle_reqd("balance", frm.doc.transaction_type == "Vacate");
        frm.toggle_display("tenant", frm.doc.transaction_type == "Vacate");
        frm.toggle_display("balance", frm.doc.transaction_type == "Vacate");
        if (frm.doc.docstatus == 0) {
            frm.set_value("room", "");
            frm.set_value("tenant", "");
            frm.set_value("balance", "");
        }

}


frappe.ui.form.on("Rental Transaction", "room", function(frm) {
	return  frappe.call({
		method: "residences.residences.doctype.rental_transaction.rental_transaction.get_room_customer",
		args: {
				"room": frm.doc.room
		},
		callback: function(r, rt) {
			if(r.message) {
				cur_frm.set_value("tenant", r.message['customer']);
				cur_frm.set_value("balance", r.message['deposit_amount']);
			}
		}
	});
});

frappe.ui.form.on("Rental Transaction", {
    validate: function(frm) {
        frm.doc.room_name = frm.doc.building + ' Room #' + frm.doc.room_number;
    },
	transaction_type: function(frm) {
        toggle_fields(frm);
	}
});

frappe.ui.form.on("Rental Transaction", "onload", function(frm) {

    toggle_fields(frm);
    cur_frm.set_query("room", function() {
        return {
            "filters": {
                "status": ((frm.doc.transaction_type == "Rent") ? 'Vacant' : 'Occupied')
            }
        };
    });
    cur_frm.set_query("customer", function() {
        return {
            query: "residences.residences.doctype.rental_transaction.rental_transaction.get_tenant_list"
        };
    });

});

cur_frm.cscript.custom_validate = function(doc) {
	if(doc.transaction_type == "Rent" && !doc.customer) {
		var msg = "Tenant should not be blank";
		msgprint(msg);
		throw msg;
	}
}