This guide provides code sample for conditionallyMandatory in IMS while testing a condition

IMS validation can provide a way to force a user to enter in a response dependent on a previous response.

As an example if response 1 is yes (yes is the condition) then a response is required for question 2. 

In the code below the two attributes involved are

EUCStatus

DecoReason

If EUCStatus's answer is Decommissioned then the attribute DecoReason requires a response before been able to save or proceed.

Method 1 with everything in just the rule:

Use the JavaScript Boolean function to typecast and test the condition.

Method 2

Use a function with an if statement to typecast instead of the Boolean function.

In the rule setup place this code

 function IsEUCStatusDecomFX(){

  if(s("EUCStatus") === "Decommissioned")
    return true;
   else return false;
  }

In the rule section place this Validation rule

  <Rule RuleName="CM_Att_DecoReason" RuleDescription="" RuleType="Validation" MessageGlobal="Your Attention is Required!" MessageLocal="Your Attention is Required!"><![CDATA[
       IsEUCStatusDecomFX() && !s("DecoReason")
  ]]></Rule>

The end result is that if IsEUCStatusDecomFX returns true and DecoReason is not defined an exclamation mark will notify the end user that their attention is required.