damage reduction addon?

Demalb16_ESO

Hello, now that multiclassing is a thing I was wondering if there is a way to track the damage reduction. For instance: the class script or the dragonknight grant u a damage reduction of 2% plus 1% for enemy that are close to you. How can I see in real time how much damage reduction i have and how this interact with an optional 15% damage dot reduction for the skill line of the necromancer? for instance in scribing the necromancer get bonus hp for corpse and if i'm not mistaken this is up even if u don't use the skill and u have it slotted, does the dragonknight skill works the same?

Demalb16_ESO

at least someone know if the class script for the dragonknight is active just by slotting it (like the necromancer)or is active only when the ability is in use?