Sometimes there is a need to access variables defined on catalog item within MRVS client script to show/hide variables within MRVS.

You can access the variables with this syntax. This works in both Native + Portal

var applicationType = g_service_catalog.parent.getValue("variableName");

Example: I have used an onLoad catalog client script which applies to MRVS and it gave me the value of outside variable when the MRVS form was loaded.

Client Script:

Output in Native:

Output in Portal: