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class ViewModel
  constructor: ->
    @loadFoobar.loading = ko.observable false
    
  loadFoobar: ->
    @loadFoobar.loading true
    
    makeAjaxRequest =>
      @loadFoobar.loading false

form(data-bind='submit: loadFoobar')
  button(type='submit', data-bind='css: { loading: loadFoobar.loading }')