Document when/how to override Modal's enforceFocus

[ocxers]

OS: OS X v10.11.6
Browser: Firefox v48.0.1
Bootstrap: v3.3.7
Description: if there is no modal, the input box can get focus; if clicks the button "Launch demo modal", the input box can not get focus any more.
Note: The modal should be high enough to show the vertical scrollbar.
JSBin: https://jsbin.com/xegenuzuve/edit?html,css,js,output

[cvrebert]

Approximate duplicate of #12142. The workaround is to override the $.fn.Modal.prototype.enforceFocus method.
#19850 tracks improving enforceFocus in v4.
We aren't likely to try to change v3 here, since it's in maintenance-mode, but the workaround is worth finally documenting properly, so recategorizing this as a documentation issue.

[ocxers]

$.fn.modal.Constructor.prototype.enforceFocus = function() {};

Thanks.

[mdo]

Bootstrap 3 is no longer being officially developed or supported.

All work has moved onto our next major release, v4. As such, this issue or pull request is being closed as a "won't fix." For additional help and support, we recommend utilizing our community resources. Thanks for your understanding, and see you on the other side of v4!

<3,
@mdo and team