How to get event field list checkbox

Hello, Bilguun,
 
Thank you for reaching out to us.
 
We would like to kindly explain that the Field List doesn't provide a checkbox event.
 
For such cases, we kindly suggest implementing your own Field List and adjusting the behavior in the desired way.
The general idea of how a custom Field List can be created is provided in the following thread: https://www.flexmonster.com/question/prevent-to-modify-fields-options/.
 
We hope this helps.
Please let us know in case further questions arise.
 
Kind regards,
Vera

Hello, Bilguun,
 
Thank you for your reply.
 
If we understand correctly, you would like to provide custom calculations (for example, count(dealsize) + count(contactLastName) + count(contactFirstname)).
If this is the case, we would like to confirm that Flexmonster supports calculated measures: https://www.flexmonster.com/doc/calculated-values/
 
We would like to provide several ways of how calculated measures can be created:

1. Via the UI:
   The Add calculated value button in the Field List can be used to open a pop-up for adding a calculated measure at runtime.
2. Programmatically:
   The addCalculatedMeasure API call can be used to add calculated measures programmatically. 
   Please see the following guide for more information: https://www.flexmonster.com/api/addcalculatedmeasure/.
3. Also, the openCalculatedValueEditor API call can be used to open the calculated value pop-up window editor. 
   Please see the following guide for more details about this method: https://www.flexmonster.com/api/opencalculatedvalueeditor/.

We hope this helps. If not, could you please provide more details on what you would like to achieve?
You are welcome to write to us if additional questions arise.
 

Kind regards,
Vera