Send an event to multiple

gtm-send-tag-to-multiple-tracking-ids.js

/**
 * # Usage
 *
 * 1. On an individual tag, update the tag configuration to have a new *Field to set*.
 * 2. Set the field name to `customTask`.
 * 3. Create a new variable for the value using the *Custom JavaScript* variable type.
 * 4. Use below for the custom JavaScript.
 */
 
function() {
	// console.log('Running customTask function...');

	// Replace newTrackingIds value with the UA property to which you want to duplicate this tag
	var newTrackingIds = ['UA-XXX-Y', 'UA-XXX-Z'];

	var globalSendTaskName = '_' + newTrackingIds[0] + '_originalSendTask';

	return function (customModel) {
		try {
			// console.log('Running customTask created function...');

			window[globalSendTaskName] = window[globalSendTaskName] || customModel.get('sendHitTask');

			customModel.set('sendHitTask', function (sendModel) {
				// console.log('Running `sendHitTask`...');

				var hitPayload = sendModel.get('hitPayload');
				var trackingId = new RegExp(sendModel.get('trackingId'), 'gi');
				window[globalSendTaskName](sendModel);

				for (var i = 0; i < newTrackingIds.length; i++) {
					var newTrackingId = newTrackingIds[i];

					// console.log('Set hitPayload on ' + newTrackingId);

					sendModel.set('hitPayload', hitPayload.replace(trackingId, newTrackingId), true);
					window[globalSendTaskName](sendModel);
				}
			});
		} catch (e) {
			console.log('Error running customTask function within Google Tag Manager.');
		}
	};
}