Limiting number of selections in a list collector

1. How do I restrict list collector values in Servicenow?
2. What is list collector?

How do I restrict list collector values in Servicenow?

Just use the catalog client script below and set the variables for the maximum number of selections and the name of the variable to apply the restriction to.

What is list collector?

The list collector variable type in the service catalog is advantageous when it comes to allowing multiple selections on a catalog variable without creating a bank of checkboxes or a bunch of extra variables for users to read through, (but only if you have a table to reference to generate your options).