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Is it possible to either prevent a second submission of a webform with the same cid (the users aren't logged in but are using links with cid and checksum) or to warn the user that they have already submitted the webform?

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    if you have the contact ID or checksum fields on the form (hidden) as a component then webform should allow you to set that component as unique - that may require webform_validation if d7
    – petednz - fuzion
    May 11, 2023 at 19:24
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    That does work, but it isn't great from a user perspective, as it doesn't say anything until after you try to submit the form and the error message is pretty cryptic. Ideally, there would be a way to warn users as soon as they load the page.
    – Lars SG
    May 11, 2023 at 19:47
  • I expect some JS might be the solution
    – petednz - fuzion
    May 12, 2023 at 20:26
  • I might look at adding something to Webform CiviCRM, as we can't be the only ones that run into this and it shouldn't be too complex.
    – Lars SG
    May 12, 2023 at 21:19
  • There is a setting for 'Per user submission limit' and if set to '1 - ever' does usually show 'You have already submitted this form.' when loaded - or at least that what it does if logged in so might do the same if validated via checksum? May 16, 2023 at 9:29

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