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Formulas to get the first and last row on a repeating table in InfoPath

You know, you wake up knowing that is going to be a wonderful day working for a customer with the software products you love. During today on-site support session, you found out that is needed to write some good old XPath formulas on an InfoPath form.

There is a repeating table with the columns necessarily to describe travel information like Departure Date, Return Date, City, you named and the requirement was to expose the initial Departure Date and the last Return Date of the entire trip, so, what do we mean with entire trip? I maybe start a trip from San Diego to Mexico City, and then another trip from Mexico City to Seattle and then from Seattle to Las Vegas. Clearly, the Departure Date and Return Date are not associated with just one row “trip” in the repeating table because I have at least more than one row for describing all the trips.

The data structure of the repeating table is:




So, here are the formulas to get the first and last row on a repeating table.

../my:TravelInfo/my:TravelInformation[count(preceding-sibling::my:TravelInformation) = 0]/my:DepartureDate

../my:TravelInfo/my:TravelInformation[count(following-sibling::my:TravelInformation) = 0]/my:ReturnDate

Fortunately, the approach work as a charm. No C# code saved the day today. Pure old good XPath did it. InfoPath, you are definitely the sunshine of my love, especially now that you will be supported until 2026 baby.