Wednesday, August 1, 2012

Feature: Validators and Converters

Data integrity is enforced with validation and conversion business rules. The Project Designer can quickly create and configure generic business rules with a single click. JavaScript, SQL, and Code (C#/Visual Basic) validators and converters are created from the context menu of the fields in Project Explorer.

Validator and Converter menu options available for fields in the Project Explorer.

Converter

The generic converter will convert the field value to uppercase.

For example, the Category Name field in the Categories controller has been configured with the default SQL converter. The sample script is shown below.

if @CategoryName is not null and 
    (@Arguments_CommandName <> 'Calculate' or
     @Arguments_Trigger = 'CategoryName')
begin
    set @CategoryName = upper(@CategoryName)   
end

The user may enter any value into the field.

Lowercase text entered into the Category Name field.

When focus is shifted away from the field, the conversion will take place.

Text in the Category Name field has been converted to uppercase.

SQL and code validators are executed on the server.

Validator

The generic validator will ensure that the field value is not blank.

The Description field of Categories controller has been configured with the default JavaScript validator:

var fieldValue = [Description];
if (fieldValue == null) {
    // prevent the default action processing
    this.preventDefault();
    // set the focus on the field and display an error
    this.result.focus('Description', 'Required field.');
}

After typing a category name, pressing OK will display a message next to the Description field, despite the fact that the field is not marked as required.

Error message displayed if the Description field is blank due to the validation rule.

These sample validators and converters can be expanded to perform more complex operations to fulfill specific business requirements. Any single validator or converter can handle multiple fields when necessary.

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