     codapServerUrl: "https://codap.concord.org/releases/latest/"
     launchButtonText: "Launch"
     fullscreenScaling: true
+    graphVisToggles: false
     tabSelected: 'link'
 
   getSharedDocumentId: ->

    @setState
      fullscreenScaling: event.target.checked

  render: ->
    sharing = @state.link isnt null


      server = encodeURIComponent(@state.codapServerUrl)
      buttonText = if @state.pageType is 'launch' then "&buttonText=#{encodeURIComponent(@state.launchButtonText)}" else ''
      fullscreenScaling = if @state.pageType is 'autolaunch' and @state.fullscreenScaling then '&scaling' else ''
      graphVisToggles = if @state.graphVisToggles then '&app=is' else ''
      "#{documentServer}/v2/documents/#{sharedDocumentId}/#{@state.pageType}?server=#{server}#{buttonText}#{fullscreenScaling}#{graphVisToggles}"
    else
      null

