Online form duplicate entries

Hi Dennis,

I think you have duplicated entries because double-click event happens. Try to prevent double-clicking on submit button.

Hi Anton

we had a case where 1 specific user made an entry with 2 days in between.

You can use BizFormItemEvents.Insert event to check by some fields that the same data already exists.

Links:

1)Global System Events: BizFormItemEvents

2)Handling form events

In this case I'd clone the Online Form webpart and make your own custom webpart which has some additional properties in it like CheckDuplicates, ByIpAddress, ByEmailAddress, CheckEntriesPerDay, EntriesPerDay etc. These properties alone will help to get what you're looking for as well without a global handler and can still be generic enough to allow the webpart to be used for all forms, this is the key.

If you want to avoid coding, you could try using online marketing to set up a condition-based contact group, that adds anyone who has submitted the form. Then use a visibility condition macro to hide the web part if the contact is in that group.