app/assets/javascripts/backbone/views/contacts/contacts_list.js.coffee
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 Xmpp.Views.Contacts ||= {}
 
 class Xmpp.Views.Contacts.ListView extends Backbone.View
   template: JST["backbone/templates/contacts/contact_list"]
 
   initialize: () ->
     _.bindAll(this)
 
     @el = '#' + @attributes['id']
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     @title = I18n.t(@attributes['title'])
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     @titleClass = @listClass = ''
     @activeGroup = false
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     @contactViews = []
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   createListContainer: ->
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     $(@el).html(@template(title: @title, isActiveGroup: @activeGroup))
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   appendContact: (contact) ->
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     if @hasContact(contact)
       return false
 
     if @contactViews.length == 0
       @createListContainer()
 
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     view =  new Xmpp.Views.Contacts.ContactView(model: contact, attributes: {listView: this})
     @contactViews.push view
     @render(view.render().el)
 
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   detachContact: (contact) ->
     matchingView = @hasContact(contact)
     if matchingView
       @contactViews = _.without(@contactViews, matchingView)
       matchingView.remove()
 
       if @contactViews.length == 0
         $(@el).html('')
 
     return !!matchingView
 
   hasContact: (contact) ->
     _.find(@contactViews, (view) ->
       view.model == contact
     )
 
   setAsActiveChatGroup: ->
     @activeGroup = true
 
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   render: (contactHtml) ->
     if (contactHtml?)
       $(@el).find('ul').append(contactHtml)
     else
       _.each(@contactViews, (i, contact) =>
         @render(contact.render().el)
       )
 
     return this