Is there a wire that I can connect to my door switches. So whenever I open the doors the bar will illuminate?

Hello, sorry for your inconvenience, this kind of light bar is controlled by Bluetooth on your phone. The switch is in the Bluetooth.

So there magnetic? I can just stick it to the bottom of my truck no wiring etc.

Hello, there is strong magnetic, and you could stick it to the bottom of your truck directly, but they still have wires to connact to power.