How to fire FieldSelecting event only in the screen? - acumatica

Question

I have a number of non persistent fields that get its value via FieldSelecting events. The events do the same queries and calculations so I decided to move them into an attribute that implements IPXFieldSelectingSubscriber interface. This works fine and it minimises duplicate codes. However, the event fires every single time the DAC is accessed. Be that in GIs or called in some other graphs. Is there such a flag to verify if the event is being fired only from a specific screen ?

Answer 1

The easiest way to do that would be to add the validation of which screen is accessing the DAC, you can do that by simply putting an if statement like below into your event handler.
if(graph.Accessinfo.ScreenID == "SO.30.10.00")
{
//execute the logic
}
else
{
//skip
}

Answer 2

An alternative solution would be to have the base field type declared on your DAC and then within a graph extension specific to the page you want the logic on, you would declare a CacheAttached event with the custom attribute.
DAC field :
public sealed class APInvoiceExtension : PXCacheExtension<APInvoice>
{
#region UsrTotal
public abstract class usrTotal : BqlDecimal.Field<usrTotal>
{
}
[PXDBDecimal]
[PXDefault(TypeCode.Decimal, "0.0", PersistingCheck = PXPersistingCheck.Nothing)]
[PXUIField(DisplayName = "Total")]
public decimal? UsrTotal { get; set; }
#endregion
}
Graph Extension :
public class APInvoiceEntryExtension : PXGraphExtension<APInvoiceEntry>
{
[PXMergeAttributes(Method = MergeMethod.Append)]
[CustomCalculationAttribute]
protected virtual void __(Events.CacheAttached<APInvoiceExtension.usrTotal> e)
{
}
}