emberjs.coffee

App = Ember.Application.create()

App.AutocompleteController = Ember.Controller.extend(
  searchText: null
  searchResults: ->
    searchText = @get("searchText")
    return  unless searchText
    regex = new RegExp(searchText, "i")
    ["one", "two", "three"].filter (name) ->
      name.match regex

  .property("searchText")
)

emberjs.html

<script type="text/x-handlebars">
  <h2>Welcome to Ember.js</h2>

  {{outlet}}
</script>

<script type="text/x-handlebars" data-template-name="index">
  {{render "autocomplete"}}
</script>

<script type="text/x-handlebars" data-template-name="autocomplete">
  {{input type="text" value=searchText placeholder="Search..."}}
  <ul>
    {{#each searchResults}}
      <li>{{this}}</li>
    {{/each}}
  </ul>
</script>