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Check If Data Exists In Table On Submit Form



Hi, I have a basic submission form with an email address field.


My goal is when the email field is filled out, it will check whether it exists in the table.


If it exists then it will not allow the submission to happen because they already have an account.


It can be either on the click of submission or onchange in the email field, both ways work for this situation. Thanks.

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That would work normally, however in my case, the table itself is allowed multiple email addresses, but for that one particular form I want them to have a unique address.


Once the form is submitted, I create an account for them where they can fill out another form that writes to the same table.


However, I dont want multiple accounts.


Basically, its a 'is username available' check.

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