I would like to show you how Chosen can be quickly integrated into your EmberJs application together with Twitter Bootstrap.
If you just want a solution, here is my gist: https://gist.github.com/andriybuday/7849057
Otherwise read a short story with some comments and “excuses” from my side.
Chosen. One of the controls we wanted to use was Chosen. “Chosen is a jQuery plugin that makes long, unwieldy select boxes much more user-friendly.” It allows you to have nice multi-selects that look like one below:
I’ve found a quick way to integrate chosen with Ember. As per me easiest way would be to utilize existing view called Ember.Select. You can embed it into your new component.
To be completely fair, my solution is not perfect, since I needed to hack html generated by Ember and manually handle selection/deselection of elements from the list, but solution below allowed me to achieve results fast without much code.
(Other option would be to avoid using Ember.Select and then play a lot with defining proper view for your component.)