Integrating Chosen jQuery component with EmberJs and Bootstrap. This code works with Ember 1.2.0, jQuery 2.0.3, TwitterBootstrap 3.0 and Chosen 1.0.0.

input-chosen-ember-component.js

App.InputChosenComponent = Ember.Component.extend({
  init: function () {
    this._super();
  },

  // settings
  labelClass: 'col-sm-2',
  label: 'Date',
  inputContainerClass: 'col-sm-2',
  inputClass: '',
  value: '',
  multiple: 'true',
  dataPlaceholder: '',
  optionLabelPath: 'content.description',
  optionValuePath: 'content.id',
  content: Ember.A(),
  chosenSelection: Ember.A(),
  selection: null,
  intputDisabled: false,

  // view properties
  labelClasses: function () {
    return this.get('labelClass') + ' control-label';
  }.property('labelClass'),
  inputContainerClasses: function () {
    return this.get('inputContainerClass')+ ' input-group';
  }.property('inputContainerClass'),
  inputClasses: function () {
    return this.get('inputClass') + ' form-control chosen-select';
  }.property('inputClass'),
  
  disabledFixer: function () {
    var chosenSelect = this.$(".chosen-select");
    chosenSelect.prop('disabled', this.get('intputDisabled')).trigger("liszt:updated");
    chosenSelect.trigger("chosen:updated");
  }.observes('intputDisabled'),

  //// dom stuff
  setup: function () {
    
    var chosenSelect = $(".chosen-select");
    chosenSelect.find('script').remove();

    chosenSelect.chosen();

    // styling setup
    chosenSelect.attr('data-placeholder', this.get('dataPlaceholder'));
    $(".chosen-choices").addClass(this.get('inputContainerClass'));
    $(".search-field > input").addClass('form-control');
    
    // initial values
    var optionValueName = this.get('optionValuePath').replace('content.', '');
    var currentSelection = this.get('chosenSelection').map(function(x) {
      return x.get(optionValueName);
    });
    chosenSelect.val(currentSelection);
    chosenSelect.prop('disabled', this.get('intputDisabled')).trigger("liszt:updated");
    chosenSelect.trigger("chosen:updated");

    // handling changes
    var self = this;
    chosenSelect.chosen().change(function (event, item) {
      if (item.selected) {
        var val = item.selected;
        var selectedItem = self.get('content').findBy(optionValueName, val);
        self.get('chosenSelection').pushObject(selectedItem);
      }
      if (item.deselected) {
        var deselected = item.deselected;
        var deselectedItem = self.get('content').findBy(optionValueName, deselected);
        self.get('chosenSelection').removeObject(deselectedItem);
      }
    });
  }.on('didInsertElement'),
  teardown: function () {
  }.on('willDestroyElement')
});

input-chosen-ember-template.hbs

<label {{bind-attr class="labelClasses"}} {{bind-attr for="inputField.elementId"}}>{{label}}</label>
<div {{bind-attr class="inputContainerClasses"}}>
  {{view Ember.Select 
    class=inputClasses
    prompt=prompt
    content=content
    value=value  
    multiple=multiple
    selection=selection
    chosenSelection=chosenSelection
    dataPlaceholder=dataPlaceholder
    optionLabelPath=optionLabelPath 
    optionValuePath=optionValuePath
    intputDisabled=intputDisabled
    viewName="inputField"}}
</div>

usage.html

<div class="form-group">
	{{input-chosen label="My Team" multiple="true" labelClass="col-sm-1" inputContainerClass="col-sm-5"
	contentBinding="allPlayers" chosenSelectionBinding="myTeamPlayers"
	optionLabelPath="content.fullName" optionValuePath="content.playerId
	dataPlaceholder="Choose team..."}}
</div>