Removed the url as required parameter

[brototyp]

Fixes/Implements #194

What changed:

• The url parameter of an Event is now an optional parameter
• The convenience methods for view and event tracking have a new optional url parameter
• When not defining a url, no default url will be generated

Do we want to add a way to generate a default url? If so, this would be my proposal:

• Add a new property contentBaseUrl to the PiwikTracker
• If this property is set, every event that has no url set will generate one by its own
• To generate a url, it will use the contentBaseUrl and append the action-array as path

Example:

• contentBaseUrl is https://piwik.org
• actions is ["docs", "requirements"]
• the url will be https://piwik.org/docs/requirements

[thbaja]

I think this is a good PR.

And a very good proposal regarding the contentBaseUrl. Perhaps this should also apply for when tracking screens?

[brototyp]

Yes, I would apply the logic to all events that are tracked. It is a bit complicated to differentiate between an event and an Event where the latter includes events, screen views and all other kind of data send to the backend.

[thbaja]

Understood 👍

[brototyp]

Just released version 4.4.0 containing this change.