Return only messages instead of the full page

[savchenko]

I am using HTMX and would rather add what's currently served by get_flashed_messages(with_categories=true) instead of re-rendering the whole page.

Is there a clever way to not return a whole body after POST? Login page would be a good example.

[jwag956]

The basic idea for single-page-applications is that they should use the JSON API rather than the stock form-based templates. There is documentation about this in the readthedocs for Flask-Security. While there is initial extra effort to do this - is allows the application to manage routing, errors, UX consistently.

[savchenko]

Appreciate that, but mine is not a SPA. Frontend sends POST request and expects HTML that can be swapped into DOM.

[jwag956]

Also note that flashing are almost always used when redirecting - normal form errors in inline.