Good way to dynamically open / close a popover (or tooltip) using angular, based on expression?

Question

I have a form that is wired into angular, using it for validation. I am able to display error messages using ng-show directives like so:

Answer 1

For ui.bootstrap 0.13.4 and newer:

A new parameter (popover-is-open) was introduced to control popovers in the official ui.bootstrap repo. This is how you use it in the latest version:

   Click me to show the popover!

For ui.bootstrap 0.13.3 and older:

I just published a small directive that adds more control over popovers on GitHub:
https://github.com/Elijen/angular-popover-toggle

You can use a scope variable to show/hide the popover using popover-toggle="variable" directive like this:

   Popover here

Here is a demo Plunkr:
http://plnkr.co/edit/QeQqqEJAu1dCuDtSvomD?p=preview