gapi-service.js

'use strict';

app.factory('Gapi', ['$q', function($q) {
  var loaded = false, loading = false;

  function makeRequest() {
    // do it later if we're not loaded yet
    if (!loaded) {
        return load().then(makeRequest);
    }
    var request = gapi.client.urlshortener.url.get({
      'shortUrl': 'http://goo.gl/fbsS'
    });
    request.execute(function(response) {
      appendResults(response.longUrl);
    });
    console.log('inside make request');
  }
  function appendResults(text) {
    var results = document.getElementById('results');
    results.appendChild(document.createElement('P'));
    results.appendChild(document.createTextNode(text));
  }
  function load() {
    if (loading) {
        return loading;
    }
    var defered = $q.defer();
    gapi.client.setApiKey('');
    gapi.client.load('urlshortener', 'v1', function(){
        loaded = true;
        defered.resolve(gapi);
    });
    loading = defered.promise;
    return defered.promise;
  }
  return {
    loadgoogle: function() {
      return load();
    }
  };
}]);