[AngularJS]23. Refactoring Product Gallery, Custom directive

Now that we've separated the Product Tabs, why not separate the Gallery too?

Create an element directive called productGallery.

Tell your new directive to use the product-gallery.html template with the templateUrl attribute.

Give our productGallery directive all the gallery functionality that is currently inside our GalleryController. Make sure that you do not delete the GalleryController yet. We don't want to break the site.

Add the controllerAs attribute to your directive setting it to gallery so the directive knows what all the references to gallery in product-gallery.html are.

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  app.directive('productGallery', function(){
    return{
      restrict:'E',
      templateUrl:'product-gallery.html',  
      controller: function(){
            this.current = 0;
              this.setCurrent = function(imageNumber){
                this.current = imageNumber || 0;
            };        
      },
      controllerAs: 'gallery'
    };
  });
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Put the gallery div inside of the provided product-gallery.html. Remove the ng-controller from the div inside the file once moved.

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       <div ng-show="product.images.length">
          <div class="img-wrap">
            <img ng-src="{{product.images[gallery.current]}}" />
          </div>
          <ul class="img-thumbnails clearfix">
            <li class="small-image pull-left thumbnail" ng-repeat="image in product.images">
              <img ng-src="{{image}}" />
            </li>
          </ul>
        </div>
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Now remove the image gallery div from index.html and the GalleryController from app.js. 

Use our new productGallery directive where the gallery div used to be in our index.html.

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<!DOCTYPE html>
<html ng-app="gemStore">
  <head>
    <link rel="stylesheet" type="text/css" href="bootstrap.min.css" />
    <script type="text/javascript" src="angular.min.js"></script>
    <script type="text/javascript" src="app.js"></script>
  </head>

  <body ng-controller="StoreController as store">
    <!--  Store Header  -->
    <header>
      <h1 class="text-center">Flatlander Crafted Gems</h1>
      <h2 class="text-center">– an Angular store –</h2>
    </header>

    <!--  Products Container  -->
    <div class="list-group">
      <!--  Product Container  -->
      <div class="list-group-item" ng-repeat="product in store.products">
        <h3>{{product.name}} <em class="pull-right">{{product.price | currency}}</em></h3>

        <!-- Image Gallery  -->
        <product-gallery></product-gallery>

        <!-- Product Tabs  -->
        <product-tabs></product-tabs>

      </div>
    </div>
  </body>
</html>
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(function() {
  var app = angular.module('gemStore', []);



  app.directive('productGallery', function(){
    return{
      restrict:'E',
      templateUrl:'product-gallery.html',  
      controller: function(){
            this.current = 0;
              this.setCurrent = function(imageNumber){
                this.current = imageNumber || 0;
            };        
      },
      controllerAs: 'gallery'
    };
  });

  app.controller('StoreController', function() {
    this.products = gems;
  });

  app.controller("ReviewController", function(){

    this.review = {};

    this.addReview = function(product){
      product.reviews.push(this.review);
      this.review = {};
    };

  });

  app.directive("productDescriptions", function() {
    return {
      restrict: 'E',
      templateUrl: "product-description.html"
    };
  });

  app.directive("productReviews", function() {
    return {
      restrict: 'E',
      templateUrl: "product-reviews.html"
    };
  });

  app.directive("productSpecs", function() {
    return {
      restrict:"A",
      templateUrl: "product-specs.html"
    };
  });

  app.directive("productTabs", function() {
    return {
      restrict: "E",
      templateUrl: "product-tabs.html",
      controller: function() {
        this.tab = 1;

        this.isSet = function(checkTab) {
          return this.tab === checkTab;
        };

        this.setTab = function(activeTab) {
          this.tab = activeTab;
        };
      },
      controllerAs: "tab"
    };
  });

  var gems = [
    {
      name: 'Azurite',
      description: "Some gems have hidden qualities beyond their luster, beyond their shine... Azurite is one of those gems.",
      shine: 8,
      price: 110.50,
      rarity: 7,
      color: '#CCC',
      faces: 14,
      images: [
        "images/gem-02.gif",
        "images/gem-05.gif",
        "images/gem-09.gif"
      ],
      reviews: [{
        stars: 5,
        body: "I love this gem!",
        author: "joe@example.org"
      }, {
        stars: 1,
        body: "This gem sucks.",
        author: "tim@example.org"
      }]
    }, {
      name: 'Bloodstone',
      description: "Origin of the Bloodstone is unknown, hence its low value. It has a very high shine and 12 sides, however.",
      shine: 9,
      price: 22.90,
      rarity: 6,
      color: '#EEE',
      faces: 12,
      images: [
        "images/gem-01.gif",
        "images/gem-03.gif",
        "images/gem-04.gif"
      ],
      reviews: [{
        stars: 3,
        body: "I think this gem was just OK, could honestly use more shine, IMO.",
        author: "JimmyDean@example.org"
      }, {
        stars: 4,
        body: "Any gem with 12 faces is for me!",
        author: "gemsRock@example.org"
      }]
      }, {
        name: 'Zircon',
        description: "Zircon is our most coveted and sought after gem. You will pay much to be the proud owner of this gorgeous and high shine gem.",
        shine: 70,
        price: 1100,
        rarity: 2,
        color: '#000',
        faces: 6,
        images: [
          "images/gem-06.gif",
          "images/gem-07.gif",
          "images/gem-08.gif"
        ],
        reviews: [{
          stars: 1,
          body: "This gem is WAY too expensive for its rarity value.",
          author: "turtleguyy@example.org"
        }, {
          stars: 1,
          body: "BBW: High Shine != High Quality.",
          author: "LouisW407@example.org"
        }, {
          stars: 1,
          body: "Don't waste your rubles!",
          author: "nat@example.org"
        }]
    }
  ];
})();
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