amp-form not populating template element

I have a simple amp-form which passed validation but, when submitted, does not populate the template values in submit-success or submit-error.

The server is currently returning a simple (canned) JSON payload of {"interesting": false, "name": "John Doe"} with a status code of 200. I have also responded with a 403 code and the same JSON payload and the error processing is successfully triggered but no token population takes place.

The payload headers are; access-control-allow-credentials:true access-control-allow-headers:Content-Type, Content-Length, Accept-Encoding, X-CSRF-Token access-control-allow-methods:POST, GET, OPTIONS access-control-allow-origin:https://unlimitedbroadband.org.uk access-control-expose-headers:AMP-Access-Control-Allow-Source-Origin amp-access-control-allow-source-origin:https://unlimitedbroadband.org.uk Content-Length:75 Content-Type:application/json Date:Thu, 12 Jan 2017 12:42:09 GMT Server:Apache/2.4.25 (Ubuntu)

I appreciate I don’t need all of these but I was attempting to eliminate any obvious issues.

Any feedback appreciated.

[cypherlou]

@mkhatib, you have spotted a massive oversight on my part for which I apologise profusely for wasting your time. The page is being drawn via a Jinja2 template engine extension to Flask which recognises { as a control character, clashing with its usage in the mustache.

I have now escaped it and it is working as expected.

Once again, sorry for wasting your time and thanks for your patience, it’s much appreciated.

[RealScatman]

For anyone that stumbles upon this and is working with Django Templates and implementing form submission success using amp-form you will need to wrap your {{message}} value with the following template tag:

                      {% verbatim %}
                      {{message}}
                      {% endverbatim %}

This should allow the amp-form to render the JsonResponse object values from your django view (provided you had a successful post.)

Reference to Django Docs https://docs.djangoproject.com/en/3.1/ref/templates/builtins/#verbatim

Was freaking out for a couple hours trying to figure this out.