This application demonstrates usage of business rules engine business-rules-engine in NodeJS. It uses example of [vacation approval business rules] (https://github.com/rsamec/business-rules/blob/master/dist/vacationApproval/README.md) - see [API documentation] (http://rsamec.github.io/business-rules/docs/classes/vacationapproval.businessrules.html).
- how to use business rules for vacation approval
- how to display errors for different languages
More complex usages of business rules engine Tutorial.
Find more business rules example in [business rules repository] (https://github.com/rsamec/business-rules) - see [API documentation] (http://rsamec.github.io/business-rules/docs/globals.html).
To install and run example
git clone https://github.com/rsamec/node-form-app
npm install
node indexAll source code is written in typescript. To compile typescript
REM to compile example usage
tsd update
tsc index.ts --t ES5 -m commonjsimport Validation = require('business-rules-engine');
import VacationApproval = require('br-vacation-approval');
//create test data
var data:VacationApproval.IVacationApprovalData = {
Employee: {
FirstName: 'John',
LastName: 'Smith toooooooooooooooooooooooooo long'
},
Deputy1: {
Checked:true,
FirstName: 'Paul',
LastName: 'Neuman',
Email: 'pneuman@gmai.com'
},
Duration: {
From: new Date(),
To: moment(new Date()).add('days', 1).toDate()
}
};
//business rules for vacation approval
var businessRules = new VacationApproval.BusinessRules(data);
//execute validation
businessRules.Validate();
//verify and display results
if (businessRules.Errors.HasErrors) console.log(businessRules.Errors.ErrorMessage);Output
Please enter no more than 15 characters.These example displays pretty error messages in english, german and czech localization.
import i18n = require('i18n-2');
var en = require('business-rules-engine/commonjs/i18n/messages_en.js');
var cz = require('business-rules-engine/commonjs/i18n/messages_cs.js');
var de = require('business-rules-engine/commonjs/i18n/messages_de.js');
//localization support
var local = new i18n({
locales:['en','cz','de'],
directory: 'node_modules/br-vacation-approval/i18n',
extension:'.json'});
_.extend(local.locales['en'],en.ValidationMessages);
_.extend(local.locales['cz'],cz.ValidationMessages);
_.extend(local.locales['de'],de.ValidationMessages);--------------------------------------------------------------------------------------------------
-- Errors
--------------------------------------------------------------------------------------------------
Vacation:
--Employee:
----Last name:Please enter no more than 15 characters.
--Deputy:
----First name:This field is required.
----Last name:This field is required.
----Email:This field is required.
--Approval:
----ApprovedBy:
------First name:This field is required.
------Last name:This field is required.
------Email:This field is required.
--Duration:
----From:Date must be between ('08/20/2014' - '08/20/2015').
----To:Please select weekdays, weekends are not permitted. Date must be between ('08/20/2014' - '08/20/2015').
----Vacation duration:Date '08/19/2014' must be before '08/10/2014'.
--------------------------------------------------------------------------------------------------
-- Errors
--------------------------------------------------------------------------------------------------
Vacation:
--Approval:
----ApprovedBy:
------First name:This field is required.
------Last name:This field is required.
------Email:This field is required.
--Duration:
----To:Please select weekdays, weekends are not permitted.
--------------------------------------------------------------------------------------------------
-- Fehlers
--------------------------------------------------------------------------------------------------
Urlaub:
--Arbeitnehmer:
----Nachname:Geben Sie bitte maximal 15 Zeichen ein.
--Vertreter:
----Vorname:Dieses Feld ist ein Pflichtfeld.
----Nachname:Dieses Feld ist ein Pflichtfeld.
----Email:Dieses Feld ist ein Pflichtfeld.
--Bestaetig:
----Bestaetig von:
------Vorname:Dieses Feld ist ein Pflichtfeld.
------Nachname:Dieses Feld ist ein Pflichtfeld.
------Email:Dieses Feld ist ein Pflichtfeld.
--Dauer:
----Von:Geben Sie bitte eines Datum zwischen ('20.08.2014' - '20.08.2015').
----Bis:Geben Sie bitte eines Datum anders von Samstag or Sonntag. Geben Sie bitte eines Datum zwischen ('20.08.2014' - '20.08.2015').
----Urlaubdauer:Das datum '19.08.2014' must vor dem datum '10.08.2014' sein.
--------------------------------------------------------------------------------------------------
-- Fehlers
--------------------------------------------------------------------------------------------------
Urlaub:
--Bestaetig:
----Bestaetig von:
------Vorname:Dieses Feld ist ein Pflichtfeld.
------Nachname:Dieses Feld ist ein Pflichtfeld.
------Email:Dieses Feld ist ein Pflichtfeld.
--Dauer:
----Bis:Geben Sie bitte eines Datum anders von Samstag or Sonntag.
--------------------------------------------------------------------------------------------------
-- Chyby
--------------------------------------------------------------------------------------------------
Dovolená:
--Zaměstnanec:
----Příjmení:Prosím, zadejte nejvíce 15 znaků.
--Zástupce:
----Jméno:Tento údaj je povinný.
----Příjmení:Tento údaj je povinný.
----Email:Tento údaj je povinný.
--Schválení:
----Schváleno kým:
------Jméno:Tento údaj je povinný.
------Příjmení:Tento údaj je povinný.
------Email:Tento údaj je povinný.
--Doba:
----Od:Datum musí být mezi ('20.08.2014' - '20.08.2015').
----Do:Datum nesmí být sobota nebo neděle. Datum musí být mezi ('20.08.2014' - '20.08.2015').
----Doba dovolené:Datum '19.08.2014' musí být před datem '10.08.2014'.
--------------------------------------------------------------------------------------------------
-- Chyby
--------------------------------------------------------------------------------------------------
Dovolená:
--Schválení:
----Schváleno kým:
------Jméno:Tento údaj je povinný.
------Příjmení:Tento údaj je povinný.
------Email:Tento údaj je povinný.
--Doba:
----Do:Datum nesmí být sobota nebo neděle.
These is an example of function how to format pretty errors output.
var displayErrors = function(node, indent) {
if (indent == 0){
console.log(Array(50).join("--"))
console.log("-- Errors");
console.log(Array(50).join("--"))
}
if (!node.HasErrors) {
console.log(local.__("NoErrors"));
return;
}
if (node.Children.length ==0) {
//stopped recursion
var msg = local.__(node.Name) + ":";
_.each(node["Errors"], function (childError:Validation.IValidationFailure, key:string) {
if (childError.HasError) {
//display validation failure - process translateArgs
var failure:Validation.IErrorTranslateArgs = childError.TranslateArgs;
//custom messages
if (failure["CustomMessage"] == undefined) {
//call standard translation
msg += failure == undefined ? failure.TranslateId : Validation.StringFce.format(local.__(failure.TranslateId), failure.MessageArgs);
}
else {
//call custom messages function - pass translation config and message args
msg += failure == undefined ? failure.TranslateId : failure["CustomMessage"](local.__(failure.TranslateId), failure.MessageArgs);
}
console.log(Array(indent + 1).join("--") + msg);
}
});
}
else {
//log name
console.log(Array(++indent).join("--") + local.__(node.Name) + ":");
//recursive call for children errors
for (var i = 0, len = node.Children.length; i < len; i++) {
if (node.Children[i].HasErrors) displayErrors(node.Children[i], indent);
}
}
}