Custom Validation

Some input widgets have built-in validation (e.g., EmailInput, NumberInput). However, you can also implement custom validation logic by setting the error property.

from abstra.forms import TextInput, run

def email_validation_page(state):
    email_input = TextInput("Email", key="email")

    if state.get("email") == "some@spam.com":
        email_input.errors = "We don't allow spam emails!"
        # Or
        # email_input.errors = ["We don't allow spam emails!", "Please use a different email."]
    return [email_input]

run([email_validation_page])

info

• Assign an error message to error for custom validation feedback.
• The error message will be displayed below the input field.