[Checkboxes] Cycling three-state checkboxes

[hartwork]

Hi! Thanks for sharing material-components-web as software libre, it's a great gift to the community!

While material-components-web does have intermediate checkboxes, I would need a version cycling through all three states — checked, indeterminate, unchecked, checked, indeterminate, .. — with each click and also send indeterminate (or a custom value) rather than on when the surrounding form is submitted to support "maybe" for an answer in my mini-Doodle jawanndenn. I'd be willing to switch jawanndenn from Materialize to material-components-web just for that feature. I have implemented a cycling tristate checkbox as a Vue.js component recently that supports form submission so I know it can be done, in general.

Is this something you envision inside our outside of core material-components-web?

Thanks and best

Sebastian

[allan-chen]

Hi Sebastian,

Thank you for your question! The three-state-cycling checkbox doesn't appear to be part of the spec. As such, we will likely not be able to support it as part of the core library. In this case we recommend that you implement a custom one that contains these state transitions, as you have done above. Let me know if you have any further questions!