A question was asked about the user agent iPhone 4 and iOS 5.0 agent.
I use the following to detect various mobile devices, viewport and screen.
I would like to distinguish iPhone 5 from all other iOS devices. As far as I know, the line that I use to detect the iOS 5.0 user agent is var iPhone5also applicable to any iOS device running iOS 5.0, so this is technically wrong.
var pixelRatio = window.devicePixelRatio || 1;
var viewport = {
width: window.innerWidth,
height: window.innerHeight
};
var screen = {
width: window.screen.availWidth * pixelRatio,
height: window.screen.availHeight * pixelRatio
};
var iPhone = /iPhone/i.test(navigator.userAgent);
var iPhone4 = (iPhone && pixelRatio == 2);
var iPhone5 = /iPhone OS 5_0/i.test(navigator.userAgent);
var iPad = /iPad/i.test(navigator.userAgent);
var android = /android/i.test(navigator.userAgent);
var webos = /hpwos/i.test(navigator.userAgent);
var iOS = iPhone || iPad;
var mobile = iOS || android || webos;
window.devicePixelRatiois the relationship between physical pixels and device-independent pixels (dips) on the device. window.devicePixelRatio= physical pixels / dips.
More details here .