Merge pull request #94 from theonion/article-position

add article positition to ad call

Author: brycedorn

src/helpers/TargetingPairs.js

@@ -31,24 +31,48 @@ var TargetingPairs = {
     return (tagMeta.tags || '').split(',');
   },
 
+  /**
+  * Gets index of article position in reading list
+  *
+  * @param HTMLElement adContainer the ad container currently being filled
+  * @param object kinjaMeta kinja-specific post meta
+  */
+  getArticlePosition: function (adContainer, kinjaMeta) {
+    if (document && adContainer && kinjaMeta.pageType === "permalink" && !(kinjaMeta.post && kinjaMeta.post.isFeatured)) {
+      var readingListPostIds = Array.from(document.getElementsByClassName('js_reading-list-item')).map(post => post.dataset.postId);
+      
+      if (readingListPostIds.length > 0) {
+        var readingListItem = adContainer.closest('.js_reading-list-item');
+        if (readingListItem) {
+          var currentPostId = readingListItem.dataset.postId;
+          return readingListPostIds.indexOf(currentPostId) + 2;
+        }
+      }
+    }
+
+    return 1;
+  },
+
   /**
    * Constructs associative array of targeting pairs from post meta
    *
    * @param Window scope the window to use for the kinja meta info.
    *
    */
-  buildTargetingPairs: function (scope, positionTargeting) {
+  buildTargetingPairs: function (scope, positionTargeting, adContainer) {
     var kinjaMeta = scope.kinja.meta,
       post = scope.kinja.postMeta || {},
       content = scope.kinja.postContentRatings || [],
       experimentVariation = Experiments.getExperimentVariation(scope),
       experimentId = Experiments.getExperimentId(scope),
       socialTargeting, key,
-      targeting = {};
+      targeting = {},
+      articlePosition = TargetingPairs.getArticlePosition(adContainer, kinjaMeta);
 
     // Begin slot level params AKA 'scp'
     targeting.slotOptions = {
       // Standard targeting options
+      article_position: articlePosition,
       pos: positionTargeting || null,
       postId: post ? post.postId : null,
       socialReferrer: SocialReferrer.getSocialReferrer(),
@@ -78,17 +102,18 @@ var TargetingPairs = {
    *
    * @param string forcedAdZone forced ad zone, if any
    * @param Window scope the window to use for the kinja meta info.
+   * @param element adContainer optional ad container to determine positioning
    *
    */
-  getTargetingPairs: function (forcedAdZone, positionTargeting) {
+  getTargetingPairs: function (forcedAdZone, positionTargeting, adContainer) {
     if (forcedAdZone && !window.kinja) {
       return { pageOptions : { forcedAdZone : forcedAdZone} };
     }
     if (!window.kinja) {
       return {};
     }
 
-    var targetingOptions = this.buildTargetingPairs(window, positionTargeting);
+    var targetingOptions = this.buildTargetingPairs(window, positionTargeting, adContainer);
 
     targetingOptions.pageOptions.forcedAdZone = forcedAdZone || false;
 

src/helpers/TargetingPairs.spec.jest.js

@@ -235,5 +235,20 @@ describe('TargetingPairs', function() {
         expect(spy).not.toHaveBeenCalled();
       });
     });
+
+    describe('article positioning', function() {
+      beforeEach(function() {
+        window.document.body.innerHTML = `
+          <div class='js_reading-list-item' data-post-id='1' >
+            <div class='ad-container' />
+          </div>
+        `;
+      });
+
+      it('returns the index of the article in reading list', function() {
+        var childElement = document.body.getElementsByClassName('ad-container')[0];
+        expect(TargetingPairs.getArticlePosition(childElement, {})).toEqual(1);
+      });
+    });
   });
 });

src/manager.js

@@ -494,7 +494,7 @@ AdManager.prototype.slotInfo = function () {
 AdManager.prototype.setSlotTargeting = function (element, slot, adUnitConfig) {
   var slotTargeting = element.dataset.targeting ? JSON.parse(element.dataset.targeting) : {};
   slotTargeting.pos = slotTargeting.pos || adUnitConfig.pos || adUnitConfig.slotName || element.dataset.adUnit;
-  var kinjaPairs = TargetingPairs.getTargetingPairs(AdZone.forcedAdZone(), slotTargeting.pos).slotOptions;
+  var kinjaPairs = TargetingPairs.getTargetingPairs(AdZone.forcedAdZone(), slotTargeting.pos, element).slotOptions;
 
   slotTargeting = utils.extend(kinjaPairs, slotTargeting);