Expression Value Element

Expression Value Element

Description

The Expression Value Element widget accepts a TACTIC Expression as the input and displays the evaluated expression as the output.

Info

Name	Expression Value Element Widget
Class	expression_value
TACTIC Version Support	2.5.0
Required database columns	Yes, a database column by the same name.

Usage

For example, we can dynamically display the number of login names in the login table. This would be an example of an absolute expression because the expression does not take into input any data from the row the field is on. A relative expression has access to the row and table information that the row the expression is on.

Note

The difference between an absolute expression and a relative expression:

-an absolute expression does not take into input any data from the row or table that the field exists on

-a relative expression has access to the row and table information that the field exists on

Implementation

Go into edit mode for the Expression Value Element widget. Input an absolute TACTIC expression as the value.

In display mode, this widget will display the result of the evaluation of the expression.

Options

There are no options available for this widget.

Example 1

For example, enter the following absolute TACTIC Expression as the value for the Expression Value Element widget:

@COUNT(sthpw/snapshot.sthpw/file)

In display mode, this widget will evaluate the expression and display the count of the number snapshot files in the database.

Example 2

For example, enter the following absolute TACTIC Expression as the value for the Expression Value Element widget:

@COUNT(sthpw/login.sthpw/login)

In display mode, this widget will evaluate the expression and display the count of the number of logins in the login table.

Example 3

For example, enter the following absolute TACTIC Expression as the value for the Expression Value Element widget:

@GET(sthpw/task["context = 'model'"].code)

In display mode, this widget will evaluate the expression and display the code for all the tasks where the context is 'model'.