How to cancel super call of a button click event through extension?

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Posted on by bjdchw

I want to add a check to the click event of a button, when check failed, I want to cancel the super call, how to do it?

I have tried to use FormControlCancelableSuperEventArgs and FormControlCancelEventArgs in event handler of clicking event, but both of them return null.

Below is my test code.

[FormControlEventHandler(formControlStr(LedgerJournalTable, Approve), FormControlEventType::Clicking)]
public static void Approve_OnClicking(FormControl sender, FormControlEventArgs e)
{
    FormControlCancelEventArgs	ce = e as FormControlCancelEventArgs;  // ce returns null
    FormControlCancelableSuperEventArgs ce = e as FormControlCancelableSuperEventArgs;  // ce returns null too
}

I know I can complete it by throw exception, but I think it is not a official way.

So how can I cancel the super call by a official way?

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Martin Dráb 231,837 Most Valuable Professional on at

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RE: How to cancel super call of a button click event through extension?

As mentioned, your design can't be implemented. Throwing an exception is a feasible workaround, but not the only one. For example, maybe you could check the condition in active() and disable the button if it's not met. Or maybe you could put the validation to the object called by the button.
bjdchw 75 on at

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RE: How to cancel super call of a button click event through extension?

Hi Will Wu,

Thank you for you reply.

Call to 'next' should be done only once and unconditionally.

So we can't use a if-else block to skip super() call.
WillWU 22,352 on at

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RE: How to cancel super call of a button click event through extension?

Hi bjdchw,

FormControlCancelableSuperEventArgs would be applicable to certain form control events, one of them is the onLookup event. It does not support the onclick event of formcontrol.

You could try to use a if-else block to skip super() call. It will be much better than throwing an exception.