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From Michal Mocny <>
Subject iOS: shouldRotateToOrientation javascript handler
Date Fri, 05 Jul 2013 14:18:51 GMT
iOS seems to have an undocumented "feature" to call into javascript before
every device orientation change (pasted below for your viewing pleasure).

I can't find any such similar functionality on other platforms, should it
be removed?  Likely we will want to write a screen orientation ( plugin instead (eventually).

    // First, ask the webview via JS if it supports the new orientation
    NSString* jsCall = [NSString stringWithFormat:
        @"window.shouldRotateToOrientation &&
        , [self mapIosOrientationToJsOrientation:interfaceOrientation]];
    NSString* res = [webView stringByEvaluatingJavaScriptFromString:jsCall];

    if ([res length] > 0) {
        return [res boolValue];

    // if js did not handle the new orientation (no return value), use
values from the plist (via supportedOrientations)
    return [self supportsOrientation:interfaceOrientation];


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