Allow Empty Dataview (Magic xpa 3.x)
The Allow Empty Dataview property provides the ability to stay on a current task (without terminating it), when running a task with a Main Source whose data view has no records.
This property is available for an Online task or Rich Client task that is in Query or Modify mode and has a Main Source.
Note: In Rich Client tasks, if a subform is in Empty Dataview, then you cannot reach it. Click here to see a technical note on this subject.
If all of the above conditions are met, and the property is set to Yes, the following will occur:
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The task mode will not be changed.
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All of the controls from any of the data view sources (including variables with the Part Of Dataview property set as Yes) will not be parkable.
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The value of those variables will be the same as in the Task Prefix.
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The Init value of those variables will be ignored, meaning that the init will be performed only on variables that are set as not “Part Of Dataview”.
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If there is a parkable control on the form, then the cursor will be placed on it. Otherwise, the cursor will not park on any control.
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The Record Suffix and Record Prefix logic will not be executed.
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Links will not be executed.
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The Empty Dataview event will be raised (so the user can implement logic).
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Events, such as Next Line, will behave as they do in Query mode where the data view has only one record.
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Tree controls will not be parkable, but they will be drawn and their context menus will be available (and work).
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Table controls will not have a Highlight Row.
If No is selected, a task will be in Create mode when no records are found.
You can also zoom and set an expression for this property. Since version: 2.4b
This property is enabled for tasks with the RM Compatible logic unit. Since version: 2.4b
Note: If an Online task running in a Subform control cannot be executed, the subform will close (and not the entire program, as in previous versions). Since version: 2.4c
Relevant interfaces: Disabled in non-interactive Rich Client tasks
Empty Dataview internal event
EmptyDataview function
