1.

Explain the validators class of WTForms in Flask?

Answer»

A validator simply takes an input, checks that it meets some criteria, such as a string length limit, and then returns. If the validation fails, a ValidationError is raised. This method is QUITE straightforward and ADAPTABLE, allowing you to link any number of VALIDATORS onto fields. In Flask, the validators class of WTForm are listed below:

  • DataRequired: To check whether the input field is empty.
  • EMAIL: To check whether the text in the field follows email ID conventions.
  • IPAddress: To validate IP address in input field.
  • Length: To verify if the length of the string in the input field is in the given range.
  • NumberRange: To validate a number in input field within given range.
  • URL: To validate URL entered in input field.


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