I have a Portal that contains 10 Containers.  Each Container is a thumbnail picture stored externally.  I want to click on the thumbnail and open a large view of picture.  I can only get it to work on first container field by opening new window.  How do you change the field by caclulation to get different container to show?

You definitely do not need a calculation for this.   The button that is attached to the thumbnail should do a "go to related record" and that puts you on the proper record for the bigger picture you want to show

The problem is that containers are stored in each Record.

I want to open each in a new window for increased size. Opening one no problem.  New Layout field change is problem.  Portal attached.

 

 

That's not a portal in the FileMaker sense of it, so be careful with the lingo.  A portal is the widget that displays related records.

 

in your case you just have a bunch of pictures in one record.  You probably should break that out and make each picture one related record in a "pictures" table. That will make things a lot easier.

 

Otherwise you need a layout with a global container on it.  The button on the thumbnail needs to pass a parameter so that you know what picture to set in the global container field for viewing, and a big IF / ELSE IF script to step through the various possible parameters

I think a Portal is going to be just fine, after all it is looking into a record with 10 picture fields.  The problem is that when I click on a container in that portal it needs to pass the field name to a  layout with only one field.  I can set up multiple layouts and it works just fine as each one has name of field.