How does a calculation rule work?

To create a calculation rule, use the SetValue action.

In the following example, when the Labs Local Hematology form is submitted, a calculation rule populates the hidden HemoglobinLabNameLL2 item with the value Hemoglobin if a value is entered in the HemoglobinValueLL2 item.

Calculation Rule to set the value of a hidden field to the name of the lab

Rule Part	Specification
Precondition	Evaluate on Form Submission
Expression	value = (this.sctHemoglobin.HemoglobinValueLL2.Empty) && !this.sctHemoglobin.HemoglobinLabNameLL2.Empty ? 2 : (!this.sctHemoglobin.HemoglobinValueLL2.Empty) && (this.sctHemoglobin.HemoglobinLabNameLL2.Empty \|\| ("Hemoglobin" != this.sctHemoglobin.HemoglobinLabNameLL2.Value)) ? 1 : 3
Action	Set Value check box is selected. Set Value clause: when value == 1 set this.sctHemoglobin.HemoglobinLabNameLL2.Value = "Hemoglobin" when value == 2 set this.sctHemoglobin.HemoglobinLabNameLL2.Empty = true

Rule Part

Specification

Precondition

Evaluate on Form Submission

Expression

value = (this.sctHemoglobin.HemoglobinValueLL2.Empty) &&

!this.sctHemoglobin.HemoglobinLabNameLL2.Empty ? 2 :

(!this.sctHemoglobin.HemoglobinValueLL2.Empty) &&

(this.sctHemoglobin.HemoglobinLabNameLL2.Empty || ("Hemoglobin" !=

this.sctHemoglobin.HemoglobinLabNameLL2.Value)) ? 1 : 3

Action

Set Value check box is selected. Set Value clause:

when value == 1

set this.sctHemoglobin.HemoglobinLabNameLL2.Value = "Hemoglobin" when value == 2

set this.sctHemoglobin.HemoglobinLabNameLL2.Empty = true