InfoPath Dev

Imagine a simplified form with 3 text fields A, B, and C, and a boolean field D. D functions as a status flag for a work flow. If A or B or C has any input (= not empty) D should be set to true. As far as I can tell there are two way to do this: rules and calculated values. I could create an action rule ‘If A not empty Or B not empty Or C not empty then set D to True’. However, to which field do I attach this rule? If I attach it to field A and leave that field empty and add content to field B, will this rule be triggered? Should I add the same rule to all three fields A,B and C? I’ll probably also need a separate rule to set D to false in case the content of a field is deleted. Maybe making D a calculated value field is better, but I find If then statements in Xpath not very straightforward. What would you suggest as the best approach? Thank you.

 Create another field i.e. Result. This will be hidden from the view.

Its default value is A ! = "" or B != "" or C !="" (a is blank, b is blank, c is blank). Make sure the option Refresh value when formula is recalculated is ticked.

On the Result field you can have 2 rules.

a. Set field D to true

Condition Result = true, set field D to true. Tick the box Dont run condition if met.

b. reset field D

Action set field d to blank.

Thank you. I'm not sure I quite get it, though.

How can A ! = "" or B != "" or C !="" be a value? This to me is a condition and not a value, and even then, what would be the syntax if I actually wanted to enter such a condition/value? If you could clarify this, that would be great. Thanks for your time.

 In my head I put the attached together.

 N.B. I'm away for 2 weeks, so maybe somebody else can pick this up. 

 ah! I get it. I had to take it much more literally than I did. The  A ! = "" or B != "" or C !="" is actually entered and results in a true or false (without IF-Then etc), which is in turn the actual value. I would have thought this required the Result field to be a Boolean but apparently it works as well with it being a string field. Learning all the time :-)

Thank you