I need to be able to check if a value exists in a record before the form is submitted.
For example.
Yep, the onSelect property should be the formula I suggested. My mistake. Put your message In place of the ... In double quotes.
Hmm. Is there an OnSubmit property? I only see the OnSelect property
In the OnSelect property of the Submit button for the form, If(IsBlank(Lookup(SPlist, CampaignID=TextInputx.Text)),SubmitForm(Form1),Notify("...",Error))