Extending a form datasource field

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Posted on by cjohnson300

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I am trying to add a modified method on the VendGroup field on the VendTable form (when changed it should update a custom field of mine). I have tried in two different ways and both have failed! I would very much appreciate someone letting me know which way is "best" and what I have done wrong!

Many thanks in advance

Try 1

[ExtensionOf(formDataFieldStr(VendTable, VendTable, VendGroup))]
final class VendTable_VendGroup_Extension
{

    public void modified()
    {
        #define.blank('')

        next modified();

        // When group changes, subgroup should be cleared
        VendTable.myNewSubGroupField = #blank;

        // Refresh Vendor data source
        VendTable_ds.refresh();

    }

}

Try 2

[ExtensionOf(formStr(VendTable))]
final class VendTable_Extension
{
    [FormDataFieldEventHandler(formDataFieldStr(VendTable, VendTable, VendGroup), FormDataFieldEventType::Modified)]
    public static void VendGroup_OnModified(FormDataObject sender, FormDataFieldEventArgs e)
    {
        #define.blank('')

        super();

        // When group changes, subgroup should be cleared
        VendTable.myNewSubGroupField = #blank;

        // Refresh Vendor data source
        VendTable_ds.refresh();
    }

}

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nmaenpaa 101,162 Moderator on at

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The first one should work, just don't call refresh of the data source.

The second one should not even compile, and you mix event handlers and Chain of Command, effectively adding a method called VendGroup_OnModified to VendTable form.

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André Arnaud de Cal... 301,194 Super User 2025 Season 2 on at

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Hi Chris,

I do agree with Nikolaos. Don't use the refresh.

I would like make another note. You are now using a macro for the empty value. In Dynamics 365, you can now use the keyword 'const' like in C#. It has multiple advantages which you can read in the next blog: (+) X++ in AX7: Const keyword - Dynamics 365 Finance Community

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cjohnson300 213 on at

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Thanks André and Nikolaos

My first block of code doesn't compile and states "The qualifier 'VendTable' is not valid in this context. Use a variable of this type instead"?

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nmaenpaa 101,162 Moderator on at

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Try this:

public void modified() { #define.blank('') VendTable vendTableLocal = element.VendTable; next modified(); // When group changes, subgroup should be cleared vendTableLocal.myNewSubGroupField = #blank; }

UPDATE: removed the .refresh() call, since you should not have it.

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André Arnaud de Cal... 301,194 Super User 2025 Season 2 on at

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Hi Chris,

If you get an error that VendTable is not recognized, you have to ensure you have the correct model references added on your extension model.

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