Grappling to prevent attacks

[Stalker0]

Here's something that recently came up. Combat starts, I have a guy say okay I'm going to ready an action to grapple any person who charges me.

He's a monk, and from what I've been reading about from a recent thread was a lot of people ignore AOO for the grapple attempt with improved unarmed strike. I like that a lot, so the guy gets a grapple with no AOO. He succeeds. Now the guy was charging with a nonlight weapon, does that mean his attack is basically foiled?

 

[Shalewind]

and from what I've been reading about from a recent thread was a lot of people ignore AOO for the grapple attempt with improved unarmed strike.

That's your DM's call. By the rules I believe a AoO is still in order. However back to your question...

Yes. If you use that version of the Grapple, ready grapple becomes very powerful. You can foil a charge. You can foil a number of attacks. If you have initative.

Edit: My bad. You ARE the DM! In that case. Go with what works! Note that this will make your monk VERY happy.