Philips TV: Current Source with HTTP JSON

Add-ons Bindings
1

Hey there,

i´m currently trying to get informations about the current Source from my Philips TV.
The JointSpace Binding can´t access any information so i tried to get it with the HTTP Binding and som JSON.

Item:

Switch tvSource "Quelle [%s]" <tv> (TV, Wohnzimmer) {http="<[http://192.168.2.14:1925/1/sources/current:10000:JS(tvSource.js)]"}

tvSource.js

JSON.parse(input).id;

http://192.168.2.14:1925/1/sources/current

{
	"id": "30"
}

Sitemap:

Text item=tvSource

I´m not getting any errors in the openhab.log but the item stays empty.
Even when changing the Source the item doesn´t get updatet…

Any ideas?

Thanks!