I have a super basic Survey123 Constraint Question....

[ScottLehto3]

Okay. Here is the logic: When a site_typ value is anything but 'T', constrain the diameter value to 0.

Here is the code: if(${site_typ} != T, .= 0)

Seems easy enough but it does not work. 

When i change the diameter value to 0, i still get an invalid message. Please help!

[ScottLehto3]

It appears i cannot use a zero in the field. Although that's what I want to do. 

The constrain objects everything other than null......I dont understand the logic here.....What am i doing wrong?

[JamieLambert · Accepted solution]

Hi Scott,

Try this:

if(${site_typ}!='T',.=0,.>0)

If T can also be 0 you can use if(${site_typ}!='T',.=0,.>=0)

You could also put in a calculation to pre-populate nonT responses.

Cheers, Jamie.

[ScottLehto3]

That's it! Thank you.