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In Form OnValidateWrite validation.

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Posted on by WaytoAx

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Hi guys,

i want to in FormDataSource onvalidateWrite how to do in set return value of the boolean (setReturnvalue(true) and as i know

table onvalidateWrite how to do the process, then i don't want to cancel any thing FormdatsourceCancelEventArgs.

[FormDataSourceEventHandler(formDataSourceStr(PurchTable,PurchLine), FormDataSourceEventType::ValidatingWrite)]
public static void PurchLine_OnValidatingWrite(FormDataSource sender, FormDataSourceEventArgs e)
{
   var datasource = sender as FormDataSource;

   var record = datasource = sender as formdataSource;
   boolean ret = true;

  if(record.NetAmount 
Thanks.

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André Arnaud de Cal... 301,130 Super User 2025 Season 2 on at

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Hi WayToAX,

In this way, you can use the FormDataSourceEventArgs variable 'e'.

like: e.setReturnValue(false);

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WaytoAx 130 on at

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Thanks For your replay André Arnaud de Calavon ,

FormDataSourceEventArgs fse = e; i already tried but not show setReturnValue(false);

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André Arnaud de Cal... 301,130 Super User 2025 Season 2 on at

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You are correct. My bad.... I reviewed a case where XppPrePostArgs was used.

What is the reason to do coding on the form datasource instead of the table?

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nmaenpaa 101,162 Moderator on at

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You could also use Chain of Command on this method, which allows you to set the return value easily.

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WaytoAx 130 on at

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i already tried many time in Table Events onvalidatewrite same process i want to do the FormDS ValidateWrite without FormdatsourceCancelEventArgs so that what to be done ?

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nmaenpaa 101,162 Moderator on at

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Why do you want to do it without FormDataSourceCancelEventArgs? Where does such requirement come from?

I assume that you have a functional requirement to run some validation logic and prevent the user from saving a record with invalid data.

Does your requirement also say that this validation must be added only on this form, but users of other forms, Excel add in and other data input methods should be allowed to enter "invalid" data (without this custom validation)?

Could you share your exact functional requirement, this way we can provide you best possible help. Thanks!

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WaytoAx 130 on at

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Thanks for your replay Nikolaos Mäenpää,

in PurchTable FormDS method Don't ValidateWrite. but i am able use COC table ValidateWrite method.

my question in FormDS onvalidateWrite how to set return value setReturnValue(false) it is possible?

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nmaenpaa 101,162 Moderator on at

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I'm not actually sure how to do it with event handler.

But here's how to do it with Chain of Command (this example will prevent users from saving any new purchase lines on PurchTable form):

[ExtensionOf(formDataSourceStr(PurchTable, PurchLine))] final class MyGreat_Extension { public boolean validateWrite() { boolean ret = next validateWrite(); Info("We are in validateWrite CoC method"); return false; } }

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