Monitor MRVS updates and get the catalogue client script working

[Shuto Sato]

Hello.
Is there a way to monitor MRVS updates and get the catalogue client script working?

The scenario is as follows.

There is an "Expenses" MRVS on the form which contains an "Amount" variable.
There is a "Total Amount" variable under the MRVS.
The requirement is that every time a line is added to the MRVS or a line is edited, the sum of all "Amounts" is calculated and the "Total Amount" is set to that value.

Currentry, we plan to perform the above process by preparing a "Confirm" checkbox and creating as On Change Catalog Client Script that will be triggered by this checkbox.

However, if there is a way to do this automatically, we would like to implement it that way.
Any advice would be appreciated.

Best regards,

Shuto

[Shuto Sato · Accepted solution]

Self Resolved.
It seems that a simple On Change Crient Script or similar cannot detect the addition or editing of MRVS rows.
It seems that creating widgets and custom variables as well as writing the necessary processing will satisfy the requirement.

https://www.servicenow.com/community/developer-forum/how-to-calculate-the-total-of-variables-into-an...