I have a requirement of checking wheather a password is already provided by anyone in a survey. This is a generic link survey.
yes, we have function
isFieldValueTaken("uniqueid", f("uniqueid").get()) in confirmit.
This function will return a boolean value (true or false) is the current entered value is already saved in that variable.
isFieldvalueTaken() function works very well. But if you have value as email id then go for
Also, just to make sure you give some field width to that question variable and check the
Indexed option in properties.