Support all tether tooltip placement options and update docs

[sethjeffery]

Currently bootstrap only supports 4 placement options, while tether supports 12.

Can we allow bootstrap's _getAttachment function to fall back to just routing the placement value straight through to tether if the map is not found? In other words, if I supply {placement: 'top right'} tether should happily receive it and not throw an error "You must provide an attachment".

On a side note, the docs need updating as the "auto" placement is no longer supported.

[maxlibin]

+1

[davidklebanoff]

Pull request #20696 closed out issue #19796 which addresses the incorrect documentation with regard to the 'auto' option.

With that said, removal of the 'auto' option is quite a step back as tooltips can now be clipped easily on smaller screens. I do believe a replacement for 'auto' is important.

One option is to replace Tether, as requested here: #19673.

[CaelanStewart]

The milestone has been changed to v4.1 ideas. Why? From what the OP says, this isn't a big change. And this only adds an inconsistency since (according to the docs) Popovers still support the 'auto' option.

EDIT

After testing, popovers don't support the 'auto' option, perhaps that should be removed from the docs too.

Also, I was not aware that you could pass an array of constraints to Tether through the options object, it looks like that can be used as a workaround until these options are implemented.

[IdanCo]

Currently bootstrap only supports 4 placement options, while tether supports 12.

I'm cooking a PR to enable all of tether placement options in bootstrap.

Considering v4 is on the verge of beta, I will make sure not break any current implementation (namely allow all 4 current placement options, in addition to the new ones).

[alecpl]

Now when we switched to Popper maybe you could create a PR to support Popper positioning options?

[Johann-S]

It would be a great improvement for sure 👍

[IdanCo]

I'd be happy to! busy week tough, probably next weekend i can sink my teeth in it.

[mdo]

Closing since dropping Tether for Popper.