If it helps i could offer you my girder script that places girders randomly.

Link : http://pastebin.com/EKt32BYs

I don't think it will help though, BTW randomly placed objects don't go through maps, Don't believe me? Set the girder place function to onTick.

That doesn’t help at all. I don’t want to place girders, I want to find out when a girder has been placed.

It took my a long while to figure it out (it annoyed me that I couldn't figure it out, and so the I kept coming back to it ) and I finally came up with a hack which works.

http://pastebin.mozilla.org/3922099

The only little problem is that, when you have infinite girders and you place one correctly, the top of the screen will mention that you have 98 girders left, although you actually have infinite girders remaining. It's a little annoying, but eh, it's not really a big deal. :P

I hope it helps, though there really should be a better way of going about it.

For your 98 error, Maybe something along the lines of if ammo girder = 98 then change the displayed string to Infinite

I don't know, I'm just being my normal "Based on theroy" self again...

With next release (0.9.21 or something),
these should work:

onSpritePlacement(spriteId, centerX, centerY)
onGirderPlacement(frameIdx, centerX, centerY)
onRubberPlacement(frameIdx, centerX, centerY)

frameIdx is given so that you can figure out the used orientation based on the girder's sprite texture:

Note: Columns go before rows
So the frameIdx for the image above goes like:

0 3 6
1 4 7
2 5  

so a frameIdx of 0 would indicate a short horizontal girder, a frameIdx of 6 a long vertical one.

  sheepluva <- me  my code stats -> 
a Hedgewars Developer

  
click here to message me

   <- where I'm from  what I speak -> 

Thank you, sheepluva. I have tested onGirderPlacement and onRubberPlacement and both work as intended. This old problem has now finally resolved.

In case you wondered, here is what I needed this for:
http://www.hedgewars.org/node/5615?page=0#comment-29932

This strategy script is now working, but not without some weird hacks.