ngInstagram Lab

Objective: Use Angular to create two versions of an Instagram search engine, one with a Parse back-end, and one with MEAN Stack.

You should be pair programming the entire time you work on this lab. That means you're using ONE computer at a time, and ONLY the "driver" is allowed to type (you'll switch roles throughout the lab).

Setup

Whoever is going to be the "driver" first should fork this repo, and clone it into their develop folder on their local machine. The "navigator" must close their computer.
Once you're in your app directory, run budo app.js --open --pushstate to open your app in the browser. You should see a blank page.
The first thing you should do is require ngRoute in your app:

Add the ngRoute CDN to index.html.
Add <div ng-view></div> somewhere inside the <body></body> in index.html.
Add ngRoute to your Angular app's dependencies in app.js.

Now you're ready to configure your routes! Place this code in app.js (and fill in the blanks):

/*
 * app.js
 */

app.config(['$routeProvider', '$locationProvider', function ($routeProvider, $locationProvider) {
  $routeProvider
    .when('/', {
      templateUrl: '',
      controller: 'SearchCtrl'
    })
    .when('/favorites', {
      templateUrl: '',
      controller: ''
    });

  $locationProvider.html5Mode({
    enabled: true,
    requireBase: false
  });
}]);

Also in app.js, create two Angular controllers to match the routes you have set up. You should add test attributes to $scope in each controller to make sure the routes, templates, and controllers are all connected.

/*
 * app.js
 */

 app.controller('SearchCtrl', ['$scope', function ($scope) {
   // add a test attribute to `$scope` here
 }]);

 app.controller('FavoritesCtrl', ['$scope', function ($scope) {
   // add a test attribute to `$scope` here
 }]);

At this point, when you navigate to / and /favorites, you should see two lines of test messages in both views.

Add a Bootstrap nav to index.html (your layout file) with links to "Search" (/) and "Favorites" (/favorites) so you can easily navigate your site.

Instagram Search

At this point, the "driver" should add, commit, and push their changes to GitHub. The "driver" should also add the "navigator" as a collaborator on their forked version of the repo. It's time to switch drivers! The new driver should clone their partner's forked version of the repo into their develop folder. The new navigator must close their computer.
Since you're going to be implementing an Instagram search engine, you need an API key from Instagram. Go to instagram.com/developer, and log in with your Instagram account (or create an account if you don't already have one).
On the Instagram developer dashboard, click "Manage Clients" on the nav, then "Register a New Client" (green button near the top). Fill out the information; not all the fields are required, so it's ok to give minimal information (if the "Website URL" is required, it should let you use http://localhost:3000).
Once you've created your new app with Instagram, leave the developer dashboard open - you'll need the "Client ID" very soon.
Back in your app, create a form in search.html for the user to search Instagram tags. The form should only have one field so the user can type in the tag to search.

Remember to use ng-model on the form input field to bind the value the user types to $scope.
Use ng-submit to listen for form submissions. When the user submits the form, ng-submit should call a function searchTag (which does not exist yet - that's the next step!).

In app.js, define a function $scope.searchTag in the SearchCtrl. When searchTag is called, make sure you can access the value the user typed in the form (using $scope and the value of ng-model). Save it to a variable called tag.
Once you've gotten the tag from the form, set up the following $http request to the Instagram API (remember to include $http in the controller's list of dependencies):

/*
 * app.js
 */

app.controller('SearchCtrl', ['$scope', '$http', function ($scope, $http) {
  $scope.searchTag = function () {
    var tag = $scope.tag;
    var url = 'https://api.instagram.com/v1/tags/' + tag + '/media/recent?client_id=YOUR_INSTAGRAM_CLIENT_ID&callback=JSON_CALLBACK';

    $http.jsonp(url)
      .then(function (response) {
        // success callback
      }, function (error) {
        // error callback
      });
  };
}]);

Note that you have to use JSONP to call the Instagram API from the client-side to bypass rules about Cross-Origin Requests.

Inside the success callback, you should clear the value of the form input field (using $scope and the value of ng-model).
Also inside the success callback, add a new attribute to $scope, $scope.photos, which should equal the array of photos that comes back from the Instagram API. You'll need to look at the API response in the Chrome developer console to inspect the structure of the response object from Instagram.
Once you have $scope.photos working, ng-repeat over the photos in the "Search" view. You should display at least:

the image URL.
the username of the user who posted the photo.
the number of "likes" the photo got.

Use the ng-pluralize directive to display the number of "likes" for each photo (e.g. "1 like", "2 likes").
Make sure your page layout looks good. Bootstrap's .thumbnail class could be helpful :)

Favorites with Parse

The current driver should add, commit, and push their changes to GitHub. Time to switch drivers again! The new driver should pull down the changes from GitHub.
Inside the ng-repeat for photos, add a link to "favorite" each photo. Use ng-click to listen for clicks on the "favorite" links. When a user clicks "favorite", ng-click should call a function savePhoto that takes in the photo as a param.
In app.js, define a function $scope.savePhoto in the SearchCtrl. When savePhoto is called, simply console.log the photo.
It would be nice if you could save the "favorited" photos somewhere, so the next step is to set up your app to use Parse! First, checkout a new branch called parse.
You'll be using ngResource to interact with Parse, so add the CDN to index.html. Your JavaScript CDNs should be in this order:

<!-- index.html -->

<head>
  ...

  <!-- angular -->
  <script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/angular.js/1.4.8/angular.min.js"></script>

  <!-- ngRoute -->
  <script type="text/javascript" src="https://ajax.googleapis.com/ajax/libs/angularjs/1.4.8/angular-route.min.js"></script>

  <!-- ngResource -->
  <script type="text/javascript" src="https://ajax.googleapis.com/ajax/libs/angularjs/1.4.8/angular-resource.min.js"></script>

  <!-- custom script (angular app) -->
  <script type="text/javascript" src="app.js"></script>
</head>

If you haven't signed up for Parse yet, go ahead and sign up and create a new app. When signing up, select the "Data" product and the "Web" environment. Then create your app and go to the app dashboard. This is where you'll see all your data.
In your Angular app, set Request Headers for Parse to send your API keys with every request. This should be a global variable outside any existing config or controllers.

/*
 * app.js
 */

var parseRequestHeaders = {
  'X-Parse-Application-Id': 'YOUR_PARSE_APPLICATION_ID',
  'X-Parse-REST-API-Key': 'YOUR_PARSE_REST_API_KEY'
};

You can find your Application Id and REST API Key in your app's dashboard under "App Settings" > "Security & Keys" (on the left sidebar).

Next you're going to set up a Photo resource to interact with Parse. Make sure to add ngResource to your Angular app's list of dependencies.
Define the Photo resource:

/*
 * app.js
 */

app.factory('Photo', ['$resource', function ($resource) {
  return $resource('https://api.parse.com/1/classes/Photo/:photoId', { photoId: '@photoId' },
    {
      query: {
        method: 'GET',
        isArray: false,
        headers: parseRequestHeaders
      },
      save: {
        method: 'POST',
        headers: parseRequestHeaders
      }
    });
}]);

Calling the Photo.query method will send a GET request to https://api.parse.com/1/classes/Photo (to get all the photos in the collection).
Calling the Photo.save method will send a POST request to https://api.parse.com/1/classes/Photo (to add a new photo to the collection).

Add Photo to SearchCtrl's list of dependencies. In the SearchCtrl, implement your savePhoto function so that it calls the Photo.save method:

/*
 * app.js
 */

$scope.savePhoto = function (photo) {
  var photoData = {
    url: photo.images.standard_resolution.url,
    user: photo.user.username,
    likes: photo.likes.count
  };

  Photo.save(photoData, function (data) {
    // success callback
  }, function (error) {
    // error callback
  });

  // or without callbacks:
  // Photo.save(photoData);
};

Now when the user clicks the "favorite" link on any photo, the photo should save to your Photo collection in parse. Check your Parse dashboard to see if it's working!
Add Photo to FavoritesCtrl's list of dependencies. To get the favorite photos to display, call the Photo.query method in the FavoritesCtrl:

/*
 * app.js
 */

app.controller('FavoritesCtrl', ['$scope', 'Photo', function ($scope, Photo) {
  $scope.favorites = [];

  Photo.query(function (data) {
    // success callback
    $scope.favorites = data.results;
  }, function (error) {
    // error callback
  });
}]);

In favorites.html, ng-repeat over favorites to display the favorite photos in the view.

Favorites with MEAN Stack

The current driver should add, commit, and push their changes to GitHub. The new driver should pull down the changes from GitHub. From the master branch, create a new branch called mean.
As an alternative to Parse, you're going to implement the same "favoriting" functionality for photos, but this time by building your own server with Mongo, Express, and Node. From your app's root directory, create a new file server.js, and run npm init in the Terminal.
Install your Node modules:

➜  npm install --save express body-parser hbs mongoose

Now would be a good time to create a .gitignore file and ignore your node_modules.

Set up your Express boilerplate in server.js:

/*
 * server.js
 */

 // require express and other modules
 var express = require('express'),
     app = express(),
     bodyParser = require('body-parser'),
     mongoose = require('mongoose');

 // configure bodyParser (for receiving form data)
 app.use(bodyParser.urlencoded({ extended: true }));
 app.use(bodyParser.json());

 // serve static files from public folder
 app.use(express.static(__dirname + '/public'));

 // set view engine to hbs (handlebars)
 app.set('view engine', 'hbs');

 // connect to mongodb
 mongoose.connect('mongodb://localhost/ng_instagram');

 // listen on port 3000
 app.listen(3000, function() {
   console.log('server started');
 });

You'll need to reorganize your file structure a bit:

➜  mkdir views
➜  mv index.html views/index.hbs
➜  mkdir public
➜  mkdir public/scripts
➜  mv app.js public/scripts/app.js
➜  mv templates public/templates

Open up index.hbs, and change the path to require app.js (since it's nested under scripts now):

<!-- index.hbs -->

<head>
  ...

  <!-- custom script (angular app) -->
  <script type="text/javascript" src="scripts/app.js"></script>
</head>

In server.js, you'll need a "catch all" route to render index.hbs for every server request:

/*
 * server.js
 */

/*
 * Load `views/index.hbs` file
 * when any route is requested from the server
 */

app.get('*', function (req, res) {
  res.render('index');
});

At this point, you should fire up your server with nodemon (you'll also want to have mongod running in another tab), and check that it doesn't crash. Also open up localhost:3000 in the browser, and make sure your Angular app is still working. You should be able to search photos from Instagram, click the "favorite" link on a photo and see a console.log, and navigate to the "Favorites" view.
Once everything is connected, your next goal is to set up API routes for photos. You'll want a route to save a new photo to the database and a route to get all the photos from the database. First, make a models folder and a Photo model:

➜  mkdir models
➜  touch models/photo.js

Inside photo.js, set up your Mongoose model:

/*
 * photo.js
 */

var mongoose = require('mongoose'),
    Schema = mongoose.Schema;

var PhotoSchema = new Schema({
  url: String,
  user: String,
  likes: Number
});

var Photo = mongoose.model('Photo', PhotoSchema);
module.exports = Photo;

Require your Photo model in server.js:

/*
 * server.js
 */

// require Photo model
var Photo = require('./models/photo');

Set up API routes for getting all photos and saving a new photo to the database (fill in the blanks):

/*
 * server.js
 */

// get all photos
app.get('/api/photos', function (req, res) {
  // find all photos in db
});

// create new photo
app.post('/api/photos', function (req, res) {
  // create new photo with form data (`req.body`)

  // save new photo in db
});

Once you have your API routes set up, test them on Postman before continuing.

Switching to the client-side, you're going to make a similar Photo resource to the one you set up with Parse, but this time, the API endpoints will be on your own server. First, make sure to include the ngResource CDN in index.hbs, and add ngResource to your Angular app's dependencies in app.js.
Define the Photo resource:

/*
 * app.js
 */

app.factory('Photo', ['$resource', function ($resource) {
  return $resource('/api/photos/:id', { id: '@_id' });
}]);

Since there is no need to set Request Headers when sending requests to your own server, the Photo resource is much simpler this time, taking advantage of the pre-baked defaults.
Calling the Photo.query method will send a GET request to localhost:3000/api/photos (to get all the photos from the database).
Calling the Photo.save method will send a POST request to localhost:3000/api/photos (to add a new photo to the database).

Add Photo to SearchCtrl's list of dependencies. In the SearchCtrl, implement your savePhoto function so that it calls the Photo.save method:

/*
 * app.js
 */

$scope.savePhoto = function (photo) {
  var photoData = {
    url: photo.images.standard_resolution.url,
    user: photo.user.username,
    likes: photo.likes.count
  };

  Photo.save(photoData, function (data) {
    // success callback
  }, function (error) {
    // error callback
  });

  // or without callbacks:
  // Photo.save(photoData);

  // or using $http:
  // $http.post('/api/photos', photoData)
  //   .then(function (response) {
  //     // success callback
  //   }, function (error) {
  //     // error callback
  //   });
};

Now when the user clicks the "favorite" link on any photo, the photo should save to the photos collection in your Mongo database. You can check your mongo CLI in the Terminal to see if it's working.
Add Photo to FavoritesCtrl's list of dependencies. To get the favorite photos to display, call the Photo.query method in the FavoritesCtrl:

/*
 * app.js
 */

app.controller('FavoritesCtrl', ['$scope', '$http', 'Photo', function ($scope, '$http', Photo) {
  $scope.favorites = [];

  Photo.query(function (data) {
    // success callback
    $scope.favorites = data;
  }, function (data) {
    // error callback
  });

  // or without callbacks:
  // $scope.favorites = Photo.query();

  // or using $http:
  // $http.get('/api/photos')
  //   .then(function (response) {
  //     // success callback
  //     $scope.favorites = response.data;
  //   }, function (error) {
  //     // error callback
  //   });
}]);

In favorites.html, ng-repeat over favorites to display the favorite photos in the view.

Name		Name	Last commit message	Last commit date
Latest commit History 13 Commits
templates		templates
app.js		app.js
index.html		index.html
readme.md		readme.md

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ngInstagram Lab

Setup

Instagram Search

Favorites with Parse

Favorites with MEAN Stack

Congrats, you've now created two fully functional Angular applications with different back-ends!!!

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ngInstagram Lab

Setup

Instagram Search

Favorites with Parse

Favorites with MEAN Stack

Congrats, you've now created two fully functional Angular applications with different back-ends!!!

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