VASTTracker

The VAST tracker constructor will process the tracking URLs of the selected ad/creative and returns an instance of VASTTracker. You can create an instance with new DMVAST.tracker( ad , creative [, variation] ).

Object ad – Reference to the <Ad> element of the selected creative.
Object creative – Reference to the <Creative> element of the selected creative.
Object variation - An optional reference to the selected <NonLinear>/<Companion> element for non-linear ads.

// Create a VAST Tracker instance for a linear ad
var vastTracker = new DMVAST.tracker(ad, creative);

// Create a VAST Tracker instance for a companion ad
var vastTracker = new DMVAST.tracker(ad, creative, companion);

Methods

Each of the methods listed below are accessed through an instance of VASTTracker.

on( eventName, listener )

Add a listener function for the specified event.

String eventName – Name of the event to attach the listener to. See events below for all details.
Function listener – Method to be called when the event is emitted.

const onSkip = function() {
  console.log('Ad unit skipped');
};

// Log a message when event 'skip' is emitted
vastTracker.on('skip', onSkip);

off( eventName [, listener] )

Remove a listener function for the specified event.

String eventName – Name of the event.
Function listener – Method to remove. Will remove all listeners for the given event if no specific callback is passed.

// Stop logging message
vastTracker.off('skip', onSkip);

setProgress( progress )

Update the current time value. This is required for tracking time related events such as start, firstQuartile, midpoint, thirdQuartile or rewind.

Number progess – Current playback time in seconds.

// Bind a timeupdate listener to the player
player.addEventListener('timeupdate', function(e) {
  vastTracker.setProgress(e.target.currentTime);
});

vastTracker.on('firstQuartile', function() {
  // firstQuartile tracking URLs have been called
});

setMuted( muted )

Update the mute state and call the mute/unmute tracking URLs. Emit a mute or unmute event.

Boolean muted – Indicate if the video is muted or not.

// Bind a volumechange listener to the player
player.addEventListener('volumechange', function(e) {
  vastTracker.setMuted(e.target.muted);
});

vastTracker.on('mute', function() {
  // mute tracking URLs have been called
});

vastTracker.on('unmute', function() {
  // unmute tracking URLs have been called
});

setPaused( paused )

Update the pause state and call the resume/pause tracking URLs. Emit a resume or pause event.

Boolean paused – Indicate if the video is paused or not.

// Bind play/pause listeners to the player
player.addEventListener('play',  function() { vastTracker.setPaused(false); });
player.addEventListener('pause', function() { vastTracker.setPaused(true); });

vastTracker.on('resume', function() {
  // resume tracking URLs have been called
});

vastTracker.on('pause', function() {
  // pause tracking URLs have been called
});

setFullscreen( fullscreen )

Update the fullscreen state and call the fullscreen tracking URLs. Emit a fullscreen or exitFullscreen event.

Boolean fullscreen – Indicate the fullscreen mode.

// Bind fullscreenchange listener to the player
// Note that the fullscreen API is still vendor-prefixed in browsers
player.addEventListener('fullscreenchange',  function(e) {
  var isFullscreen = !!document.fullscreenElement;
  vastTracker.setFullscreen(isFullscreen);
});

vastTracker.on('fullscreen', function() {
  // fullscreen tracking URLs have been called
});

vastTracker.on('exitFullscreen', function() {
  // exitFullscreen tracking URLs have been called
});

setExpand( expanded )

Update the expand state and call the expand/collapse tracking URLs. Emit a expand or collapse event.

Boolean expanded – Indicate if the video is expanded or not.

// Sample function for a button that increase/decrease player size
var playerExpanded = false
expandButton.addEventListener('click',  function(e) {
  playerExpanded = !playerExpanded
  if (playerExpanded) {
    increasePlayerSize()
  } else {
    decreasePlayerSize()
  }
  vastTracker.setExpand(playerExpanded);
});

vastTracker.on('expand', function() {
  // expand tracking URLs have been called
});

vastTracker.on('collapse', function() {
  // collapse tracking URLs have been called
});

setSkipDelay( duration )

Must be called if you want to overwrite the <Linear> Skipoffset value. This will init the skip countdown duration. Then, every time you call setProgress(), it will decrease the countdown and emit a skip-countdown event with the remaining time.

Do not call this method if you want to keep the original Skipoffset value.

Number duration – The time in seconds until the skip button is displayed.

// Overwrite linear Skipoffset value – 5s countdown
vastTracker.setSkipDelay(5);

load()

Report the impression URI. Can only be called once. Will report the following URI:

All <Impression> URI from the <InLine> and <Wrapper> tracking elements.
The creativeView URI from the <Tracking> events

Once done, a creativeView event is emitted.

// Bind canplay listener to the player
$player.on('canplay', function() {
  vastTracker.load();
});

vastTracker.on('creativeView', function() {
  // impression tracking URLs have been called
});

errorWithCode( code )

Send a request to the URI provided by the VAST <Error> element. If an [ERRORCODE] macro is included, it will be substitute with code.

String code – Replaces [ERRORCODE] macro. [ERRORCODE] values are liste in the VAST specification.

var MEDIAFILE_PLAYBACK_ERROR = '405';

// Bind error listener to the player
$player.on('error', function() {
  vastTracker.errorWithCode(MEDIAFILE_PLAYBACK_ERROR);
});

complete()

Must be called when the user watched the linear creative until its end. Call the complete tracking URLs. Emit a complete events when done.

// Bind ended listener to the player
$player.on('ended', function() {
  vastTracker.complete();
});

vastTracker.on('complete', function() {
  // complete tracking URLs have been called
});

close()

Must be called when the player or the window is closed during the ad. Call the closeLinear (in VAST 3.0) and close tracking URLs. Emit a closeLinear or a close event when done.

// When user exits the page
window.onbeforeunload = function() {
  vastTracker.close();
};

// use for VAST 3.0 linear ads
vastTracker.on('closeLinear', function() {
  // ...
});

// Use for VAST 2.0 linear ads or companion ads
vastTracker.on('close', function() {
  // ...
});

skip()

Must be called when the skip button is clicked. Call the skip tracking URLs. Emit a skip event when done.

// Bind click listener to the skip button
$skipButton.on('click', function() {
  vastTracker.skip();
});

vastTracker.on('skip', function() {
  // skip tracking URLs have been called
});

click()

Must be called when the user clicks on the creative. Call the tracking URLs. Emit a clickthrough event with the resolved clickThrough URL when done.

// Bind click listener to the player
$player.on('click', function() {
  vastTracker.click();
});

vastTracker.on('clickthrough', function(url) {
  // Open the resolved clickThrough url
  document.location.href = url;
});

Events

creativeView

Emitted after load() method has been called.

start

Only for linear ad with a duration. Emitted on the 1st non-null setProgress(duration) call.

progress-[0-100]%

Only for linear ad with a duration. Emitted on every setProgress(duration) calls, where [0-100] is the adunit percentage completion.

progress-[currentTime]

Only for linear ad with a duration. Emitted on every setProgress(duration) calls, where [currentTime] is the adunit current time.

firstQuartile

Only for linear ad with a duration. Emitted when the adunit has reached 25% of its duration.

midpoint

Only for linear ad with a duration. Emitted when the adunit has reached 50% of its duration.

thirdQuartile

Only for linear ad with a duration. Emitted when the adunit has reached 75% of its duration.

complete

Only for linear ad with a duration. Emitted after complete() has been called.

resume

Emitted when calling setPaused(paused) and changing the pause state from true to false.

pause

Emitted when calling setPaused(paused) and changing the pause state from false to true.

rewind

Emitted when setProgress(duration) is called with a smaller duration than the previous one.

skip

Emitted after calling skip().

closeLinear

Only for linear ad, emitted when close() is called

close

Only for non-linear ad, emitted when close() is called

mute

Emitted when calling setMuted(muted) and changing the mute state from false to true.

unmute

Emitted when calling setMuted(muted) and changing the mute state from true to false.

fullscreen

Emitted when calling setFullscreen(fullscreen) and changing the fullscreen state from false to true.

exitFullscreen

Emitted when calling setFullscreen(fullscreen) and changing the fullscreen state from true to false.

clickthrough

Emitted when calling click() if there is at least one <clickThroughURLTemplate> element. A URL will be passed as a data.

Files

tracker.md

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