Loading Status for Angular

LoadingStatus.coffee

angular.module("LoadingStatus", [])
.factory "Loading", ($q)->


  class Loading
    constructor: ()->


    loadingDecorator : (key, context, httpRequestTarget) =>
      ###
      Use this to Decorate (wrap) the call to a $http Promise, and in turn returns a new function to call the $http promise with .

      key: string, the key where you want to store the loading state for this
      context: object, the "this" where the http request lives
      httpRequestTarget: the method call such that
        httpRequestTarget.apply(context, httpArgs) calls the $http method


      Example:

        getUser = loadingDecorator("user", UserService, "getUserFromAPI")

        user = getUser({id:123})

      ###

      return (httpArgs...) =>
        @trackLoading( key, httpRequestTarget.apply(context, httpArgs) )


    trackLoading : (key, httpRequest) =>
      ###
      Use this method if you do not want to create a decorator, but still want to track the loading state of a Promise

      Example:
        user = trackLoading("user", UserService.getUserFromAPI({id:123}))

      ###
      @[key] = true
      stopLoad = (data) =>
        @[key] = false
        return data

      stopLoadError = (data) =>
        @[key] = false
        $q.reject data

      httpRequest.then stopLoad, stopLoadError