Collapsible error container elements do not indicate that they are interactive

[Denis Anuschewski]

On the debug page for a server error the collapsible elements in the traceback view do not clearly indicate that they are in fact interactive:

1) The little icon on the right corner is way too small I think and also far away from the element's inner content (see ​https://ant.design/components/collapse for a possible alternative).

2) The element does not stand out in a way that it indicates it's interactive. It could have e.g. a border to separate it from the background.

Also the elements are not selectable via keyboard and the tab button.

Example: ​https://django-admin-tests.netlify.app/django_admin_tests/v5.1/english/defaults/500/

[Natalia Bidart]

Accepting on the basis that I have used Django for more than 15 years and I did not know this existed!!!
I agree that improving the discoverability of this feature would certainly be a positive thing for the framework.

Denis, would you like to prepare a patch? I would suggest to first reach out to the Django Accessibility Team (​via the Django forum) to agree on a proper accessible design fix. Thank you!

[Denis Anuschewski]

Hey Natalia.

Thx, will do that.

Shout out to Thibaud Colas who 1st found this behaviour.

[Denis Anuschewski]

​https://forum.djangoproject.com/t/usability-of-server-error-traceback-collapsibles/27322

[Thibaud Colas]

Note there are three separate issues here:

1. Bug: the current implementation is unusable for keyboard and voice control users due to adding interactivity to list item elements.
2. Somewhere between a bug and a usability fail: placing the "this is collapsible" signifier all the way to the right means it’s more or less impossible to spot for users of screen magnification
3. And usability issue – it’s hard to understand this is interactive.

I’d recommend fixing them all at once by introducing a "toggle" button to the left of the line number, so we can solve the issue at hand without reinventing the current designs. That button will be focusable and can either have a visible "toggle" label or icon + tooltip, plus hover styles (see for example ​how GitHub does it).

[Denis Anuschewski]

Another suggestion for a simple solution:

Adapt the icon for the collapsible link "Local vars" just under the gray error box (placed on the left of the line number just like Thibaud mentioned).
Plus implement a thin border to let the box stand out more.

[Abhijeet Singh]

Hay!

Have a look at this quick prototype
Notable Additions :
Hovering Messages


And a Button on the left side to indicate that the element is interactable :

[Abhijeet Singh]

I created a PR: ​https://github.com/django/django/pull/17784

[Sarah Boyce]

Note that #35189 also deals with collapsible elements and accessibility concerns might be similar both (and might make sense to be reviewed together).

[Abhijeet Singh]

Hay! I just opened a Discord Thred to discuss the Patch Improvement, I would appreciate if you checked it out
(​https://discordapp.com/channels/856567261900832808/1236418777323671633)

[Denis Anuschewski]

Hey there.

In the meantime I came up with my own approach. You can check out my PR if you like: ​https://github.com/django/django/pull/18198

The collapsible code line elements are now rendered as details/summary tags and are slightly more highlighted by having a thin border plus a differently colored icon (+/-) which indicates toggling functionality.

Some javascript was needed for adjusting the behavior of the details/summary tags as they did not allow the center code line element to be in the middle after opening (it always pops up on top). But it's not much and the end result works and feels the same as with native details and summary tags. Plus the HTML markup is now more semantic.

With the new changes you can also "step" through the elements by clicking on tab/shift+tab and easily open and close them without losing focus.

Keyboard ninjas will hopefully appreciate this ⌨️🥷

Cheers
Denis