How to pass previous values from business rules to script action in servicenow

[18wj1a05d2]

I am unable to pass previous values to script action from Business Rules. could you please help me.

Many thanks,

Raghuveer

[Brad Bowman]

Post your attempt.  Have you logged the previous value in the Business Rule to ensure it is captured correctly before looking for it elsewhere?

[Renat Akhmedov]

Hi @18wj1a05d2, 

You can pass previous values from a Business Rule into a Script Action, but not automatically - you must pass them explicitly using Event parameters. A script action only receives the values that you send through the gs.eventQueue() call.

Best regards,
Renat Akhmedov

[Ankur Bawiskar]

@18wj1a05d2 

yes it's possible to send via event parm1 or event parm2

something like this

(function executeRule(current, previous /*null when async*/ ) {

    // Add your code here
    gs.eventQueue('eventName', current.state, previous.state);

})(current, previous);

Then in script action you can grab this

var currentValue = event.parm1;
var previousValue = event.parm2;

An Examination of gs.eventQueue 

💡 If my response helped, please mark it as correct ✅ and close the thread 🔒— this helps future readers find the solution faster! 🙏

[M Iftikhar]

Hi @18wj1a05d2 ,
To pass previous values from a Business Rule to a Script Action, you must send them through event parameters, because Script Actions cannot access previous directly.

Business Rule

gs.eventQueue(
  'your.custom.event',
  current,
  current.your_field,      // param1
  previous.your_field      // param2
);

Script Action

var currentValue = event.parm1;
var previousValue = event.parm2;

Script Action now receives both current and previous values.

If my response helped, please mark it as the accepted solution so others can benefit as well.