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Out of curiosity I've been playing with jQuery to determine the browser's screen size, and it occurred to me that screen size could be used to determine whether or not a visitor was using an iPhone/iTouch to view the site.

So I used the following to test this:

$(document).ready(

    function() {

        var screenX = screen.width,
            screenY = screen.height;

        alert("X: " + screenX + " Y: " + screenY);

        if (screenX == 320 && screenY == 396) {
            $('div#wrap').css('background-color','#f00');
        }

        else if (screenY == 320 && screenX == 396) {
            $('div#wrap').css('background-color','#0f0');
        }
    }
);

On viewing the page via iPhone, I notice that the dimensions are consistently (regardless of orientation):

x: 320, y: 396

This is regardless of orientation. I haven't, as yet, attempted to use an onChange event to detect changes (mainly because I'm still so new at jQuery), but I wondered if there was a way to determine, via jQuery or plain javascript, the iPhone/iTouch's orientation?

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window.orientation will give you an integer that denotes the rotation. You can listen for orientation changes by adding an event to the body:

<body onorientationchange="updateOrientation();">

Just on the off-chance that the link dies or gets moved at some point:

Value  |  Description
-------+-------------------------------------------------------------------------------
 0     |  Portrait orientation. This is the default value.
-90    |  Landscape orientation with the screen turned clockwise.
 90    |  Landscape orientation with the screen turned counterclockwise.
 180   |  Portrait orientation with the screen turned upside down. This value is currently not supported on iPhone.

与恶龙缠斗过久,自身亦成为恶龙;凝视深渊过久,深渊将回以凝视…
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