What are some effective techniques for validating forms using WTForms?
An example of an AI chatbot conversation about WTForms validation techniques.
What are some effective techniques for validating forms using WTForms?
WTForms provides several validation techniques, including built-in validators like DataRequired, Email, and Length. You can also create custom validators.
Can you give me an example of a custom validator?
Sure! A custom validator can be defined as a function that raises a ValidationError if the input doesn't meet certain criteria. For example, you could check if a username is already taken.
How do I apply multiple validators to a single field?
You can apply multiple validators by passing them as a list to the field. For example: username = StringField('Username', [DataRequired(), Length(min=4, max=25)])
What should I do if I want to display custom error messages?
You can specify a message parameter in your validators. For example: Email(message='Please enter a valid email address.') will show your custom message.
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