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Business Rules

In the USoft approach, business rules are the primary communication

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Patrick Camphuijsen

Handlebars

This article covers handlebars as a way of getting USoft UI controls from jQuery expressions. This is part of the UI Library.The UI Library is a mixed bag of Javascript extensions for programming UI controls in USoft web pages. Do not confuse with the structured UDB object model for data exchange between USoft web pages and a Rules Engine.USoft Web Designer uses handlebars to create HTML within its class factories. Documentation on Handlebars can be found on http://handlebarsjs.com.A GUI element normally consists of three parts:HTML CSS JavaScriptThe HTML of a GUI element is described in a factory using a technology called handlebars. A compiled handlebar definition is stored in the template member of a factory object and is a function that, when called, returns a string that can be converted into HTML:<div {{attr "*"}} />It is possible to add extra functionality to the handlebar library. This is done by registering new 'helpers':Handlebars.registerHelper('name', function(items,

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Adding a default record when a another record is inserted

Anyone here who can show me the right direction to achieve the following ? I try to explain it clearly. Table Aircraft_types has the columns pattern_id, aircraft_id, version_nr, aircraft_class )When someone insert a new record in this table Aircraft_types, a default record need to be inserted into the same Aircraft_types table. it's important that this new record has the same value for Aircraft_id and pattern_id. the aircraft_class need to be retrieved from the column Classid from the aircraft_pattern based on the new pattern_idand it's also important that the default record doesn't need to be created when there is already a record where pattern_id and aircraft_id are identical.So for examplesomene enters the recordpattern_id = BE9M and aircraft_id = P47.The default record that has to be created ispattern_id = BE9M aircraft_id = BE9Maircraft_class = must contain the value of this select : select aircraft_class from aircraft_patterns where pattern_id = 'BE9M' I've tried a constraint a

Promises for asynchronous Javascript

This article explains the idea of promises and tells you why and how to code .then(), .catch() and .finally() clauses in USoft web applications.It gives some explanation about USoft's udbPromise object and how it is different from Javascript's standard Promise object.Promises are a JavaScript feature that represents the eventual completion (or failure thereof) of an operation of an asynchronous nature.Promises make web applications more responsive. They use as much of the browser's execution capabilities as possible. Promises have been integrated into every aspect of the USoft Web API.Promises in USoft can lead to unexpected results that are difficult to debug. To avoid this, make sure that you can predict the way in which operations in .then() branches follow each other. For details, go to the Promises in USoft section of this article.A better alternative for asynchronous calls Promises in USoft How does a promise help you in USoft? Where USoft implements promises Upgrading to promise

Rens Kersbergen

News & announcements

Register for the webinar

USoft 11 is the latest release of the USoft platform. We hereby invite you of the Release 11 webinar on April 23rd where we will show you all the ins and outs.Register for the webinar https://www.usoft.com/webinar/webinar-april-9-whats-new-in-release-11

Between business rules and implementations

Vocabularies in USoft Definer

See alsoFormulations in USoft DefinerA vocabulary is a body of shared concepts structured according to the relations between them.Practically, in USoft Definer 11, a vocabulary is a collection of formulations that is subject to automatic colour-coding and hyperlinking as a set of formulations that clarify each other.The intended use is that you map a single USoft Studio vocabulary to a single USoft Definer vocabulary. If you work in this way, vocabulary is only a background concept that you should not spend time over.If you import (synchronise) formulations from USoft Studio to USoft Definer, a vocabulary is automatically created and all the imported formulations are made part of it. You can view the Vocabulary record via the Teamwork, Preparation, Vocabularies menu option.The concept of vocabulary is introduced in USoft 11 to make it possible in the future to refer to multiple vocabularies from a single USoft Definer repository.

Patrick Camphuijsen

$.udb.navigateTo()

This article is about the navigateTo() function of the udb object.$.udb.navigateTo()Navigates to a different page.Returns a Promise object or the 'this' object. From USoft 10.0.1I, returns a udbPromise instead of a Promise object.If you navigate away from a page, asynchronous operations are in risk of being annulled if they do not return a promise (as opposed to just executing with an undefined result). For a full discussion of this risk, click here.Syntax .navigateTo( page, options )options ::= { targetFrame: target-frame, applyChanges: apply-changes, newPage: new-page, quiet: quiet, promise: promise, success: success-function, error: error-function}apply-changes ::= { true | false }new-page ::= { true | false }quiet ::= { true | false }promise ::= { true | false }The required page is a string that identifies the page being navigated to.Options is a struct that can have the following items, all of which are optional.Target

Domain and table internal components

table.GetInitialData

This article is about the table.GetInitialData method of table internal components.See alsoInitial Datatable.GetInitialDataReturns the initial data defined for table table.By default, a table does not have initial data. In practice, most tables do not have initial data.Syntax 1INVOKE table.GetInitialDataSyntax 2SELECT table.GetInitialData()ExampleThis gets initial data for a table named EVP_PARAMETER:SELECT evp_parameter.GetInitialData()

Patrick Camphuijsen

dataset

The dataset event may be called from web pages developed in Web Designer and processed by a USoft page engine service.Event Applies to Occurs when dataset Page objects When data is received for any data source in the page. dataset Data source objects When data is received for the data source. At the time when data is received, you can address the retrieved values, but no retrieved row has been designated as the “current row” as yet.How to useFind or create an Event Listener object with Event Type = dataset. Event Listeners are in the Web Designer Controls catalog:Insert the event listener into the page or data source object. Insert a callClientScript action into the event listener. Use this action's Script property to code the behaviour that you want to see when the event occurs.Examplealert(this.rows().length+" records queried");where, assuming the dataset event occurs at data source level, this is the data source object.You are implicitly associating the event with an

Patrick Camphuijsen

colpostupdate

This article is about the colpostupdate UDB event handler.colpostupdateThe colpostupdate event may be called from web pages developed in Web Designer and processed by a USoft page engine service.Event Applies to Occurs when colpostupdate Data source objects After a value in a column is updated * * Whether the value is updated manually or by looking up a (new) value from a dropdown list.PurposeYou can use this event to supplement a user UPDATE with follow-on actions based on the result of the update (the new values). How to useFind or create an Event Listener object with Event Type = beforecheckdata. Event Listeners are in the Web Designer Controls catalog:Insert the event listener into the data source object. Insert a callClientScript action into the event listener. Use this action's Script property to code the behaviour that you want to see when the event occurs. A typical pattern is to specify the condition under which you want to manipulate the user input, and then

Patrick Camphuijsen

colpreupdate

This article is about the colpreupdate UDB event handler.colpreupdateThe colpreupdate event may be called from web pages developed in Web Designer and processed by a USoft page engine service.Event Applies to Occurs when colpreupdate Data source objects Before a value in a column is updated * * Whether the value is updated manually or by looking up a (new) value from a dropdown list.PurposeYou can use the colpreupdate event to manipulate programmatically a value that a user supplied manually for update.How to useFind or create an Event Listener object with Event Type = colpreupdate. Event Listeners are in the Web Designer Controls catalog:Insert the event listener into the data source object. Insert a callClientScript action into the event listener. Use this action's Script property to code the behaviour that you want to see when the event occurs. A typical pattern is to specify the condition under which you want to manipulate the user input, and then to specify how yo

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