What are the best practices for Single-Page Apps tracking using Launch? Basically, I'm looking for a robust techique for collecting / dispatching virtual pageviews (JS framework agnostic).
Here https://marketing.adobe.com/resources/help/en_US/experience-cloud/launch/c_extension-dtm.html I found that Launch Core extension contains events like “Custom Event” and “Data Element Changed”. I suppose I should use one of these features, but not sure which one to select as I don’t know their pros and cons.
On the web I found some examples for DTM only, I don’t know if they are applicable to Launch.
Any suggestions / documentation on this?
Thanks a lot!
We've build a framework for tracking, in which we use for DTM / Launch Custom Events. With Direct Call Rules, you can only reference a "static" Digital Data object, which might cause race conditions if you're not managing your Digital Data Object correctly.
The advantage of Custom Events is that you can pass context data with the event; so we're passing the Digital Data Object as event data, and reference this directly from within DTM / Launch.
This works flawless within traditional page based sites, as with SPA's. In an SPA, Dev would just "trigger" a "Page impression" event. In a traditional page based site, the "Page impression" is a trigger call on document.ready.
+1 on using custom events in preference to direct call rules in SPA environments.
+1 on letting the SPA tell Launch when a page has changed as it accounts for hard loads, and soft navigation equally well.
+1 on passing the DDO as the payload on the event (the presence of "event" as a free variable was sort of an easter egg in DTM).
I used to prefer using custom events Event Based Rules to using Direct Call Rules because DCRs couldn't handle additional conditions, but now in Launch, they can, so I think it's more a matter of preference.
But I agree, you definitely want to use one or the other to let Launch know when the new page view has occurred (after the new page view's data layer is in place).
Single Page Apps | Digital Data Tactics has a bunch of documentation on Single Page Apps (both Launch or DTM).
And Setting up an Event-based Rule that be fired directly like a Direct Call Rule | Digital Data Tactics has some use case and examples for Custom Events, and DTM Examples has (buried in the source code) a working example.
Moderator Note: Since this question has turned more into a discussion, I'm going to change this into a discussion. The discussion will allow users to read each of these answers without the need to select a single one as correct.
I also use Custom Events
1) due to the lack of conditional ruling in Direct Calls,
2) DDL context: DC's can only read "the" static object... so if you would fire 2 DC's which might change your DDL in between distinctively, you're never sure if both DC's are reading the DDL at the correct moment for their context (race condition).
Since I'm working hard on changing from "page based analytics" into "event based analytics", which is more suitable for modern app frameworks (e.g. react, vue, etc...), proper DDL context on each event is crucial. If interested, please view my work on
This is the framework I mentioned earlier. The repo points to a set of other repo's with front-end code. The DTM translator holds the Custom Event implementation for DTM/Launch.
Thanks for sharing that repo. Awesome work. I'm 100% in agreement with your thoughts on a movement away from page-based analytics and toward event-based analytics. The event-based approach is much more flexible and can be used everywhere. I think that it will fit especially well as a feeder to Adobe Launch but has the benefit of potentially serving any number of other consumers (i.e. any other client-side process that wants to listen for the events).
I also agree with you on the use of Custom Event Rules in preference to Direct Call Rules. I'm very encouraged that we can now layer conditions on top of DCR's in Launch, but the ability to send event data directly to CER's is so much better in my opinion.