Checking for screen resolution on the secondary screen?

How to?

[NooK]

I am trying to get the screen resolution from the user computer and so far the scrpt below seems fine

alert("You screen width is "+window.screen.width+"\nYou screen height is "+window.screen.height);

The problem is that recently I had a user, run the script on a computer that has 2 screens.

He opened a browser window on the main screen, which yelled the correct resolution, he then moved the browser window to the secondary screen and refreshed the page. The secondary screen is running a lower resolution yet the script still says that it has the primary screens resolution.

Is there any way to get the proper screen resolution?

The problem is that I change the CSS file depending on the user resolution and that kinda breaks the system.

Regards

NooK

[poppyrich]

Darned good question. It's an issue that's occurred to me but I've never tested for it but now I am. If I can get to it quickly, I'll let you know what I find out.

My guess, right now, is that one of the screens is designated in some way as "primary" to use your word. And, of necessity - since the browser can't return two values for the same property - that's the screen used to report screen.width/height.

[NooK]

Yeah I'd imagine that browser should return the resolution on the screen the browser is currently on but it doesn't seem to be the case. :(

Give me a shout if you come up with anything because so far googling hasn't gotten me anywhere and I can't anything on the javascript API that even mentions specific screen properties.

[poppyrich]

Based on my own very unscientific and very narrow test using my main laptop and external screen - giving me two screens to play around with. Here's what I think:

The operating system designates one screen as Primary. (In the graphics properties box - an NVIDIA driver and accompanying utilities - there is actually a graphic representation of both screens with a big "1" on one of them and a "2" on the other.)

All window.screen properties return values based on the Primary screen. The secondary screen is treated as an extension, a "silent partner" to the primary.

My instincts tell me that it just HAS to be this way. Can you imagine the confusion if it didn't? How would it handle pop-up windows? The mind starts boggling very fast.

And, yeah, my search didn't find much of any value, either.