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How do I detect when the iPhone goes into landscape mode via JavaScript? Is there an event for this?

Answer 1

+12 A:

Yup, via the onorientationchange event and the window.orientation property.

Paul D. Waite 2009-05-11 23:06:46

That's also an elegant solution.

Thanks 2009-05-11 23:26:13

FYI The login requirement for Apple's Safari Reference Library has been removed.

Pullets Forever 2010-07-21 14:34:21

@Pullets Forever — ah, excellent, thank you. Updated accordingly.

Paul D. Waite 2010-07-21 14:49:58

Answer 2

A:

You could check the document body width. If it suddenly becomes smaller or bigger, you know what happened. You may measure it with an interval.

window.setInterval(function() {
    // check body with here and compare with global variable that holds the last measurement
    // you may set a boolean isLandscape = true if the body with became bigger.
}, 50);

Thanks 2009-05-11 23:25:35

Not entirely sure that would work: `document.body.clientWidth` seems to return the same value in portrait and landscape (at least on the page I’m working on). There might be other properties you could check though.

Paul D. Waite 2009-05-11 23:50:14

You would have to use something like getComputedStyle, and ask for the computed width of the body tag. If that doesn't work in the safari, try currentStyle. Also make sure that the body tag receives a width=100%.

Thanks 2009-05-12 08:30:59

Yeah, that could work. It’s just that Mobile Safari’s notion of dimensions seems a bit abstract, because of the scaling it does with the iPhone’s screen. You don’t seem to actually get more pixel width (in terms of your layout) when it goes landscape, even though there are more physical pixels available.I haven’t actually checked what the various properties return though.

Paul D. Waite 2009-05-12 09:22:16

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How do I detect when the iPhone goes into landscape mode via JavaScript? Is there an event for this?

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