In order to do so, you define templates for forms and fields (i.e. Later at runtime the templates can be filled out by users.VPE provides a complete programming interface for your applications, which allows you to enable and disable Controls, to handle the focus, the keyboard and mouse input as well as validating and changing the values of fields.
For example: Data type validation is customarily carried out on one or more simple data fields.
The simplest kind of data type validation verifies that the individual characters provided through user input are consistent with the expected characters of one or more known primitive data types; as defined in a programming language or data storage and retrieval mechanism as well as the specification of the following primitive data types: 1) integer; 2) float (decimal); or 3) string.
Rules can be collected through the requirements capture exercise.
In evaluating the basics of data validation, generalizations can be made regarding the different types of validation, according to the scope, complexity, and purpose of the various validation operations to be carried out.
The Interactive Edition is an enhancement of the Enterprise Edition and only available for Windows.
It offers editable objects (Controls), which can be placed into the VPE preview.
Structured validation allows for the combination of any of various basic data type validation steps, along with more complex processing.
Such complex processing may include the testing of conditional constraints for an entire complex data object or set of process operations within a system.
Whether a grade is correct can only be established by clerical checks or by reference to other files.
During systems design, therefore, data definitions are established which place limits on what constitutes valid data.
The difference between data validity and accuracy can be illustrated with a trivial example.