Get transformation item count in macro

For the most part, there isn't a default way to grab another web part's information or count. What you can do however (although it will depend greatly on the first repeater rendering first, so make sure it's higher on the page template) is you can use Kentico's API to set a macro value. Use an custom macro method or custom transformation method to send the DataItemCount to the following call:

CMS.MacroEngine.MacroContext.CurrentResolver.SetNamedSourceData("MyCustomCarouselCount", TheNumber);

As long as the above runs before your other one, you should now be able to get the number through the macro

{% MyCustomCarouselCount %}

However i would ask...why do you need the count, there may be an easier way to do what you want to do.

Thanks Trevor -

The transformation is in a web part which is an image carousel... I just need to know if there are any images present so that I can draw a navigation anchor to the carousel in the top section of the page.

Sometimes what i do if i need to have something like an image carousel and have a navigation, is to simply duplicate the repeater and make the 2nd one the navigation. You can use the transformation "IsFirst()" to display only on the first element, then use the DataItemCount from it. Try that!