Extension of Delegate Handler Method

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Posted on by PhilMatthews

Good afternoon,

I am looking to extend an existing method in order to add an additional field to the Job Registration screen. This method is Forms\JmgRegistration.mapPreviewFieldControlToFieldNameDelegateHandler().

The method that I am trying to extend is thus:

 /// 
    /// Delegate handler for mapping a preview field control to JmgFieldName enumerations.
    /// 
    /// The name of the control to map.
    /// A collection where the mapped enumerations can be returned
    [SubscribesTo(classStr(JmgRegistrationForm), delegateStr(JmgRegistrationForm, mapPreviewFieldControlToFieldNameDelegate))]
    public static void mapPreviewFieldControlToFieldNameDelegateHandler(FormControlName _controlName, Set _fieldNames)
    {
        switch (_controlName)
        {
            case formControlStr(JmgRegistration,preProd_prodOrder):
                _fieldNames.add(JmgFieldName::ProdOrder);
                break;
            case formControlStr(JmgRegistration,preProd_OprActId):
                _fieldNames.add(JmgFieldName::OperationActivity);
                break;

            etc etc...

        }

    }



I have tried to extend it like so:

[ExtensionOf(classstr(JmgRegistrationForm))]
final class JmgRegistrationFormTTN07720_Extension
{

    public static void mapPreviewFieldControlToFieldNameDelegateHandler(FormControlName _controlName, Set _fieldNames)
    {

        switch (_controlName)
        {
            case formControlStr(JmgRegistration,CuttingListId):
                _fieldNames.add(JmgFieldName::CuttingListId);
                break;
        }

        next mapPreviewFieldControlToFieldNameDelegateHandler(_controlName, _fieldNames);
    }

}

This extension is never called.

Please can someone advise me where I am going wrong?

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Answers (1)

Martin Dráb 237,884 Most Valuable Professional on at

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I would expect it to work (I don't know how you tested whether the method gets called), but I wouldn't use it anyway. Why don't you simply subscribe to the same delegate?

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PhilMatthews 77 on at

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Thanks for the response Martin. I'm testing whether it is called using debugging in VS using breakpoints in lines 8 and 11 in my code.

I've now amended as per your suggestion to subscribe to the delegate like so:

[ExtensionOf(classstr(JmgRegistrationForm))] final class JmgRegistrationFormTTN07720_Extension { [SubscribesTo(classStr(JmgRegistrationForm), delegateStr(JmgRegistrationForm, mapPreviewFieldControlToFieldNameDelegate))] public static void mapPreviewFieldControlToFieldNameDelegateHandlerTTN(FormControlName _controlName, Set _fieldNames) { switch (_controlName) { case formControlStr(JmgRegistration,CuttingListId): _fieldNames.add(JmgFieldName::CuttingListId); break; } } }

It still doesn't get called though. I've verified this using debugging on my code and also some latter code which cycles through the content of the _fieldNames Set.

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Verified answer

Martin Dráb 237,884 Most Valuable Professional on at

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Maybe you have a problem with debugging. What if you try to add a message to infolog? Like this:

[ExtensionOf(classstr(JmgRegistrationForm))] final class JmgRegistrationFormTTN07720_Extension { [SubscribesTo(classStr(JmgRegistrationForm), delegateStr(JmgRegistrationForm, mapPreviewFieldControlToFieldNameDelegate))] public static void mapPreviewFieldControlToFieldNameDelegateHandlerTTN(FormControlName _controlName, Set _fieldNames) { info("Handler is called!"); } }

If everything is compiled and deployed, and you execute code that calls the delegate, and no other delegate throws an exception, then this method must be called and you should see a message in infolog.

Note that I instentionally don't look for a particular _controlName. If I did, I wouldn't be testing whether the method is called. It would be testing whether it's called for a particular control, which is a different question.

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PhilMatthews 77 on at

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Thank you for your help on this Martin, you are correct. Two issues in play here:

1) The debugger was not being triggered. I am unsure why, so will troubleshoot that myself.

2) I had added the field to the wrong grid setup.

I will just slide away and pretend that this never happened. Thank you for your help.

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