support progress event with exact offset values

Author: clarissedmn

src/vast_tracker.js

@@ -211,7 +211,7 @@ export class VASTTracker extends EventEmitter {
         for (let i = this.lastPercentage; i < percent; i++) {
           events.push(`progress-${i + 1}%`);
         }
-        events.push(`progress-${Math.round(progress)}`);
+        events.push(`progress-${progress}`);
         for (const quartile in this.quartiles) {
           if (
             this.isQuartileReached(quartile, this.quartiles[quartile], progress)
@@ -778,6 +778,32 @@ export class VASTTracker extends EventEmitter {
     }
   }
 
+  /**
+   * Calls the tracking URLs for progress events for the given eventName and emits the event.
+   *
+   * @param {String} eventName - The name of the event.
+   * @param macros - An optional Object of parameters(vast macros) to be used in the tracking calls.
+   * @param once - Boolean to define if the event has to be tracked only once.
+   */
+  trackProgressEvents(eventName, macros, once) {
+    const eventTime = parseFloat(eventName.split('-')[1]);
+
+    Object.keys(this.trackingEvents)
+      .filter(trackingEvent => trackingEvent.startsWith('progress-'))
+      .map(trackingEvent => ({
+        name: trackingEvent,
+        time: parseFloat(trackingEvent.split('-')[1])
+      }))
+      .filter(({ time }) => time <= eventTime)
+      .forEach(({ name }) => {
+        this.emit(name, { trackingURLTemplates: this.trackingEvents[name] });
+        this.trackURLs(this.trackingEvents[name], macros);
+        if (once) {
+          delete this.trackingEvents[name];
+        }
+      });
+  }
+
   /**
    * Calls the tracking URLs for the given eventName and emits the event.
    *
@@ -804,6 +830,10 @@ export class VASTTracker extends EventEmitter {
       eventName = 'close';
     }
 
+    if (eventName.startsWith('progress-')) {
+      this.trackProgressEvents(eventName, macros, once);
+    }
+
     const trackingURLTemplates = this.trackingEvents[eventName];
     const isAlwaysEmitEvent = this.emitAlwaysEvents.indexOf(eventName) > -1;