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Simo Ahava | NetBooster
GTM For NerdsMeasureCamp V – 20 September 2014
function MeasureCampV() { this.awesome = awesome; }
GTM For NerdsMeasureCamp V – 20 September 2014
@SimoAhava
http://google.me/+SimoAhava
www.simoahava.com
function MeasureCampV() { this.awesome = awesome; }
MASTERED by desire impulsive,By a mighty inward urging,I am ready now for singing,Ready to begin the coding --
A. Gallen-Kallela: The Boat’s Lament
@SimoAhava | MeasureCamp V
What is dataLayer
A JavaScript Array
@SimoAhava | MeasureCamp V
What is dataLayer
A JavaScript Array dataLayer = [];
@SimoAhava | MeasureCamp V
What is dataLayer
A JavaScript Array dataLayer = []; dataLayer.push('item1'); // dataLayer[0] => 'item1’
@SimoAhava | MeasureCamp V
What is dataLayer
A JavaScript Array dataLayer = []; dataLayer.push('item1'); // dataLayer[0] => 'item1' dataLayer.push({'item2' : [{'data1' : true},{'data2' : 'Peter'}]});
// dataLayer[1] => 'item2' : Array[2]
@SimoAhava | MeasureCamp V
What is dataLayer
A JavaScript Array dataLayer = []; dataLayer.push('item1'); // dataLayer[0] => 'item1' dataLayer.push({'item2' : [{'data1' : true},{'data2' : 'Peter'}]});
// dataLayer[1] => 'item2' : Array[2] var item2 = dataLayer.pop(); // item2 => Array[2], dataLayer[1] =>
undefined
@SimoAhava | MeasureCamp V
What is dataLayer
A JavaScript Array dataLayer = []; dataLayer.push('item1'); // dataLayer[0] => 'item1' dataLayer.push({'item2' : [{'data1' : true},{'data2' : 'Peter'}]});
// dataLayer[1] => 'item2' : Array[2] var item2 = dataLayer.pop(); // item2 => Array[2], dataLayer[1] =>
undefined dataLayer.push({'event' : 'gtm.js'}); // No special effects
@SimoAhava | MeasureCamp V
What is dataLayer
A JavaScript Array dataLayer = []; dataLayer.push('item1'); // dataLayer[0] => 'item1' dataLayer.push({'item2' : [{'data1' : true},{'data2' : 'Peter'}]});
// dataLayer[1] => 'item2' : Array[2] var item2 = dataLayer.pop(); // item2 => Array[2], dataLayer[1] =>
undefined dataLayer.push({'event' : 'gtm.js'}); // No special effects
There is absolutely nothing special about dataLayer ... or is there?
@SimoAhava | MeasureCamp V
What is dataLayer
A JavaScript Array dataLayer = []; dataLayer.push('item1'); // dataLayer[0] => 'item1' dataLayer.push({'item2' : [{'data1' : true},{'data2' : 'Peter'}]});
// dataLayer[1] => 'item2' : Array[2] var item2 = dataLayer.pop(); // item2 => Array[2], dataLayer[1] =>
undefined dataLayer.push({'event' : 'gtm.js'}); // No special effects
There is absolutely nothing special about dataLayer ... or is there? It’s the default name of the data structure that Google Tag Manager
uses
@SimoAhava | MeasureCamp V
What is dataLayer
…but it looks like GTM overrides the default push() method:
@SimoAhava | MeasureCamp V
What is dataLayer
…but it looks like GTM overrides the default push() method:
This does three (visible) things:
@SimoAhava | MeasureCamp V
What is dataLayer
…but it looks like GTM overrides the default push() method:
This does three (visible) things:1. Initiates a listener which processes the new state of dataLayer after each
push()2. Sets the maximum length of dataLayer to 3003. Instead of returning the length of the Array, a push() returns true if no tags
were fired and false if tags were fired – synchronous operation for ”Wait for Tags”!
@SimoAhava | MeasureCamp V
What is dataLayer
…but it looks like GTM overrides the default push() method:
This does three (visible) things:1. Initiates a listener which processes the new state of dataLayer after each
push()2. Sets the maximum length of dataLayer to 3003. Instead of returning the length of the Array, a push() returns true if no tags
were fired and false if tags were fired – synchronous operation for ”Wait for Tags”!
These will all be part of the specification that vendors need to adhere to
Memory management such as setting the maximum length of the Array will eventually be configurable
A. Gallen-Kallela: Lemminkainen’s Mother
THERE the blood-stained data model,There Google's son and hero,Cuts in pieces dataLayer,Chops it with his mighty hatchet --
@SimoAhava | MeasureCamp V
What is Google Tag Manager’s data model
An abstract data model, which passes and processes data from dataLayer to Google Tag Manager
@SimoAhava | MeasureCamp V
What is Google Tag Manager’s data model
An abstract data model, which passes and processes data from dataLayer to Google Tag Manager
dataLayer Data modelTool-agnostic Tool-specific
Generic Unique
Accessed directly Accessed via helper
Structured Abstract
@SimoAhava | MeasureCamp V
What is Google Tag Manager’s data model
In GTM, the interface exposes two methods: google_tag_manager["GTM-XXXX"].dataLayer.get('key') google_tag_manager["GTM-XXXX"].dataLayer.set('key','value')
@SimoAhava | MeasureCamp V
What is Google Tag Manager’s data model
In GTM, the interface exposes two methods: google_tag_manager["GTM-XXXX"].dataLayer.get('key') google_tag_manager["GTM-XXXX"].dataLayer.set('key','value')
These are used to access the data stored in the data model, and should not be used directly
@SimoAhava | MeasureCamp V
What is Google Tag Manager’s data model
In GTM, the interface exposes two methods: google_tag_manager["GTM-XXXX"].dataLayer.get('key') google_tag_manager["GTM-XXXX"].dataLayer.set('key','value')
These are used to access the data stored in the data model, and should not be used directly
Using get() retrieves the most recent value for ’key’ dataLayer.push({'key1' : 'value1'}); // dataLayer[0] google_tag_manager["GTM-XXXX"].dataLayer.get('key1'); // 'value1' dataLayer.push({'key1' : 'value2'}); // dataLayer[1]! google_tag_manager["GTM-XXXX"].dataLayer.get('key1'); // 'value2'
@SimoAhava | MeasureCamp V
What is Google Tag Manager’s data model
Cool, get() works nicely with dotted names and nested objects dataLayer.push({'key1.id' : '123'}); google_tag_manager["GTM-XXXX"].dataLayer.get('key1.id'); // '123' dataLayer.push({'key2' : {'id' : '234'}}); google_tag_manager["GTM-XXXX"].dataLayer.get('key2.id'); // '234’
@SimoAhava | MeasureCamp V
What is Google Tag Manager’s data model
Cool, get() works nicely with dotted names and nested objects dataLayer.push({'key1.id' : '123'}); google_tag_manager["GTM-XXXX"].dataLayer.get('key1.id'); // '123' dataLayer.push({'key2' : {'id' : '234'}}); google_tag_manager["GTM-XXXX"].dataLayer.get('key2.id'); // '234’
Yes, get() is the method that is called by your Data Layer Variable Macros
@SimoAhava | MeasureCamp V
What is Google Tag Manager’s data model
Cool, get() works nicely with dotted names and nested objects dataLayer.push({'key1.id' : '123'}); google_tag_manager["GTM-XXXX"].dataLayer.get('key1.id'); // '123' dataLayer.push({'key2' : {'id' : '234'}}); google_tag_manager["GTM-XXXX"].dataLayer.get('key2.id'); // '234’
Yes, get() is the method that is called by your Data Layer Variable Macros
So… When a dataLayer.push() occurs, the arguments are copied to the
data model
@SimoAhava | MeasureCamp V
What is Google Tag Manager’s data model
Cool, get() works nicely with dotted names and nested objects dataLayer.push({'key1.id' : '123'}); google_tag_manager["GTM-XXXX"].dataLayer.get('key1.id'); // '123' dataLayer.push({'key2' : {'id' : '234'}}); google_tag_manager["GTM-XXXX"].dataLayer.get('key2.id'); // '234’
Yes, get() is the method that is called by your Data Layer Variable Macros
So… When a dataLayer.push() occurs, the arguments are copied to the
data model The get() method can be used to retrieve data from the data model
A. Gallen-Kallela: The Forging Of The Sampo
dataLayer, worthy brother,Thou, my faithful indexed Array,Come and see this wondrous beauty,Abstract structure, awesome methods --
@SimoAhava | MeasureCamp V
Peculiarities of the data model
Changing value type overwrites the previous value dataLayer.push({'key1' : [1, 2, 3]}); google_tag_manager["GTM-XXXX"].dataLayer.get('key1'); // Array[3] dataLayer.push({'key1' : 'cool'}); google_tag_manager["GTM-XXXX"].dataLayer.get('key1'); // 'cool'
@SimoAhava | MeasureCamp V
Peculiarities of the data model
Changing value type overwrites the previous value dataLayer.push({'key1' : [1, 2, 3]}); google_tag_manager["GTM-XXXX"].dataLayer.get('key1'); // Array[3] dataLayer.push({'key1' : 'cool'}); google_tag_manager["GTM-XXXX"].dataLayer.get('key1'); // 'cool'
Array to Array and plain object to plain object behave a bit differently dataLayer.push({'key1' : [1, 2, 3]}); google_tag_manager["GTM-XXXX"].dataLayer.get('key1'); // [1, 2, 3] dataLayer.push({'key1' : [4, 5]}); google_tag_manager["GTM-XXXX"].dataLayer.get('key1'); // [4, 5, 3]!
@SimoAhava | MeasureCamp V
Peculiarities of the data model
Updating an Array in the data model is clumsy (and not a good idea) dataLayer.push({'key1' : [1, 2, 3]}); var k = google_tag_manager["GTM-XXXX"].dataLayer.get('key1'); // [1, 2, 3] k.push(4, 5); google_tag_manager["GTM-XXXX"].dataLayer.get('key1'); // [1, 2, 3, 4, 5]
@SimoAhava | MeasureCamp V
Peculiarities of the data model
Updating an Array in the data model is clumsy (and not a good idea) dataLayer.push({'key1' : [1, 2, 3]}); var k = google_tag_manager["GTM-XXXX"].dataLayer.get('key1'); // [1, 2, 3] k.push(4, 5); google_tag_manager["GTM-XXXX"].dataLayer.get('key1'); // [1, 2, 3, 4, 5]
So there’s a special ’command array’ you can use, which accesses all supported methods of the value
dataLayer.push({'key1' : [1, 2, 3]}); dataLayer.push(['key1.push', 4, 5]); // Note the square brackets! google_tag_manager["GTM-XXXX"].dataLayer.get('key1'); // [1, 2, 3, 4, 5]
@SimoAhava | MeasureCamp V
Peculiarities of the data model
Plain object to plain object is more straightforward dataLayer.push({'key1' : {'one' : 1}}); google_tag_manager["GTM-XXXX"].dataLayer.get('key1'); // {one: 1}
@SimoAhava | MeasureCamp V
Peculiarities of the data model
Plain object to plain object is more straightforward dataLayer.push({'key1' : {'one' : 1}}); google_tag_manager["GTM-XXXX"].dataLayer.get('key1'); // {one: 1} dataLayer.push({'key1' : {'two' : 2}}); google_tag_manager["GTM-XXXX"].dataLayer.get('key1'); // {one: 1}, {two: 2}
@SimoAhava | MeasureCamp V
Peculiarities of the data model
Plain object to plain object is more straightforward dataLayer.push({'key1' : {'one' : 1}}); google_tag_manager["GTM-XXXX"].dataLayer.get('key1'); // {one: 1} dataLayer.push({'key1' : {'two' : 2}}); google_tag_manager["GTM-XXXX"].dataLayer.get('key1'); // {one: 1}, {two: 2} dataLayer.push({'key1' : {'one' : {'two' : 3}}}); google_tag_manager["GTM-XXXX"].dataLayer.get('key1'); // {one: {two: 3}},
{two: 2}
@SimoAhava | MeasureCamp V
Peculiarities of the data model
You can also run your own functions on values in the data model dataLayer.push({'key1' : {'one' : 1}}); dataLayer.push(function() {
var key1 = this.get('key1');
if(key1.hasOwnProperty('one') {
this.set('key1', {'one' : 2});
}
}); google_tag_manager["GTM-XXXX"].dataLayer.get('key1'); // {one: 2}
@SimoAhava | MeasureCamp V
Thank you
www.simoahava.com/analytics/data-layer/
www.simoahava.com/analytics/google-tag-manager-data-model/
#GTMtips
@SimoAhavahttp://google.me/+SimoAhava
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