Play animation multiple times

I'm adding the shake animation to a password modal, when the password is wrong it will shake, and this works great so far, however, when I try to submit the wrong password again, it won't shake a second time. What would be the process to get this to work?

So far I have this code

```
ngfx-shake="modal.wrongPassword"
```

And in my controller on a wrong password I have this

```
++vm.wrongPassword;
```

How can I get something that makes this fire the animation multiple times in a row without having to have some sort of timeout to reset the value after the animation is done