2024 December Release

COOSYSTEM@1.1:attrmustbedefexpr Permanent link for this heading

Expression for Computing, Whether the Property Must be Defined

This expression is evaluated to determine whether a property must contain a value.
If the expression returns null or throws an error, the default behavior applies (i.e. defined with attrmustbedef).

Explanation:
Defines an app.ducx expression computes, whether the property must be defined, i.e. whether it must contain a value (see also attrmustbedefexpr).

string[] COOSYSTEM@1.1:attrmustbedefexpr readonly(inst)(
  object ::root,
  AttributeDefinition ::attribute,
  boolean ::isvalue,
  boolean ::isedit,
  boolean ::iseditcommon,
  boolean ::isdashboard,
  boolean ::issingleattribute,
  Action ::context)

Local Scope: dictionary
Global Scope: dictionary
Returns: boolean

Name

Description

::root
contains the object the expression is evaluated for. ::root is identical to cooobj.

::attribute
contains the property the expression is evaluated for.

::isvalue
contains true if the form is used for displaying values (edit mode or read-only mode) opposed to query mode (see valuetype in ApplicationView).

::isedit
contains true if the form is in edit mode opposed to read-only mode (see edittype in ApplicationView). ::isedit is only valid if ::isvalue is true.

::iseditcommon
contains true if the form is used to edit common properties of multiple objects. ::iseditcommon is only valid if ::isvalue is true. In this case ::root/cooobj refer to the first object of the selection.

::isdashboard
contains true if the property is displayed in a dashboard.

::issingleattribute
contains true if the property is displayed in single attribute mode, i. e. when all other properties of a form page are hidden.

::context
contains the view action which is used to determine the form. Typical view actions are: