Tetragnatha montana | Aceh Insect

Tetragnatha montana, is a species of long-jawed orb weaver from the family Tetragnathidae. I found them a lot here, in a plant I do not know the name. They attach themselves to leaves or branches quietly waiting for prey to come. Their legs always stretch forward and back so they look very long.

Something I really want to see at that moment is when they eat.
How do they eat?
I waited a long time but did not get any of them eating. I often find other species of spiders while they eat, but not to this species.
Maybe next time!