Forum:Dark Ilussion Vs Field Spell

Well... This happened in a duel and im not sure if that is valid or not... i activated spider web, a field spell and when i activated that my opponent activated a trap card called Dark Illusions.

The problem is the card say: "Negate the activation of a Spell Card, Trap Card, or Effect Monster's effect that targets a face-up DARK monster, and destroy that card."

But the field spell affect all monsters and even if that the effect i think is not activated until one attack but i confused.

¿Dark Illusions can cancel the effect o a field spell?