Is there a python web framework/toolkit that provides client-side form validation?

Question

There are a lot of tools to build html forms using python ¹ . Most of these provide a means to do form validation, but only on the server side (ie, after the submit button is pressed). Are there any ways to implement a client-side form validation in python? Do client-side operations this complicated require JavaScript?

¹ for example: https://wiki.python.org/moin/WebComponents

Answer 1

The web2py framework has client-side validation options.

There is a plugin called plugin_ValidationEngine that implements server-side validators on the client side, and powerformwizard (see https://bitbucket.org/rochacbruno/powerformwizard/overview ) does something similar in a wizard-steps kind of format.

There may be others -- there are numerous contributed plug-ins for web2py.