Hi Okta community 
I see preSubmit functionality for signup pre-defined flow
Is there also a preSubmit functionality for login flow?
Our use case is to validate with a custom API if the user is allowed to log in or not, and based off on that, continue with the login process
Hello,
There is transformUserName, but this does not provide a way to abort a login attempt.
There currently isn’t an exposed hook to do this.
One way would be to add your own listener to the submit button and stop propagation of the event.
Functionality requests can be done at https://ideas.okta.com
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