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Call form extension method on datafield event handler

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Posted on by Evisa

Hello everybody,

I have added FieldA on ProjTable table and eventually in the form.

I need to run some logic when the field is modified on the form.

So, I have created MethodA on ProjTable_Form_Extension class and I am trying to call it from the data field event handler.

Below the code:

[FormDataFieldEventHandler(formDataFieldStr(ProjTable, ProjTable, FieldA), FormDataFieldEventType::Modified)]
public static void FieldA_OnModified(FormDataObject sender, FormDataFieldEventArgs e)
{
FormDataSource projTable_ds = sender.datasource() as FormDataSource;
FormRun formRun = sender.datasource().formRun() as FormRun;
ProjTable projTable = projTable_ds.cursor();

formRun.methodA();
}
}

[ExtensionOf(formStr(ProjTable))]
final class ProjTable_Form_Extension
{
public void methodA()
{

//logic here

}

When I modify the field on the form, I get the below error: FormRun object does not have method 'methodA'.

Can anybody help me, please?

Thanks in advance!

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Martin Dráb 239,242 Most Valuable Professional on at

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A better approach will be using a CoC extension of the data source and referring the the form by element variable.

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Waed Ayyad 9,108 Super User 2026 Season 1 on at

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Hi,

Use the FormDataSourceField COC and add your method there.

[ExtensionOf(formDataFieldStr(ProjTable, ProjTable, FieldA))] final class XXXProjTable_ProjTableFieldA_Extension { public void modified() { FormDataObject formDataObject = any2Object(this) as FormDataObject; FormDataSource formDataSource = formDataObject.datasource(); next modified(); this.MethodA(); } public void methodA() { //logic here } }

Thanks,

Waed Ayyad

If this helped, please mark it as "Verified" for others facing the same issue

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Waed Ayyad 9,108 Super User 2026 Season 1 on at

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Hi,

Is your issue resolved? If yes, mark the answers that helped you as verified.

Thanks
Waed Ayyad

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Waed Ayyad 9,108 Super User 2026 Season 1 on at

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Hi,

Is your issue resolved? If yes, mark the answers that helped you as verified.

Thanks
Waed Ayyad

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