Access Catalog item variable inside MRVs

[pk31]

I have a requirement, In which I need to use catalog item variables inside MRVS.
In mrvs, I have one lookup select box, and I want to display values in the lookup select box based on the value of catalog item variable.

[ViktoriaMikoova]

In Washington it's possible with the new g_service_catalog API. Just create onLoad catalog client script on the MRVS and you can use this to get any value from the catalog item variables: 

g_service_catalog.parent.getValue('<some_var_name>');

g_service_catalog - Client Documentation