Detect rotation of Android phone in the browser with JavaScript

Question

I know that in Safari on an iPhone you can detect the screen s orientation and change of orientation by listening for the onorientationchange event and querying window orientation for the angle   Is this possible in the browser on Android phones   To be clear  I am asking whether the rotation of an Android device can be detected by JavaScript running on a standard web page  It is possible on an iPhone  and I wondered whether it could be done for Android phones

User · Answer

It is possible in HTML5  You can read more  and try a live demo  here  http   slides html5rocks com  slide-orientation   window addEventListener  deviceorientation   function event        var a   event alpha      var b   event beta      var g   event gamma     false     It also supports deskop browsers but it will always return the same value

User · Answer

Worth noting that on my Epic 4G Touch I had to set up the webview to use WebChromeClient before any of the javascript android calls worked   webView setWebChromeClient new WebChromeClient

User · Answer

Cross browser way    window  on  resize orientationchange webkitfullscreenchange mozfullscreenchange fullscreenchange    function      code here

User · Answer

two-bit-fool s excellent answer provides all the background  but let me attempt a concise  pragmatic summary of how to handle orientation changes across iOS and Android    If you only care about window dimensions  the typical scenario  - and not about the specific orientation   Handle the resize event only  In your handler  act on window innerWidth and window InnerHeight only  Do NOT use window orientation - it won t be current on iOS          If you DO care about the specific orientation   Handle only the resize event on Android  and only the orientationchange event on iOS  In your handler  act on window orientation  and window innerWidth and window InnerHeight     These approaches offer slight benefits over remembering the previous orientation and comparing    the dimensions-only approach also works while developing on desktop browsers that can otherwise simulate mobile devices  e g   Chrome 23   window orientation is not available on desktop browsers   no need for a global anonymous-file-level-function-wrapper-level variable

User · Answer

To detect an orientation change on an Android browser  attach a listener to the orientationchange or resize event on window      Detect whether device supports orientationchange event  otherwise fall back to    the resize event  var supportsOrientationChange    onorientationchange  in window      orientationEvent   supportsOrientationChange    orientationchange     resize    window addEventListener orientationEvent  function         alert  HOLY ROTATING SCREENS BATMAN     window orientation         screen width      false     Check the window orientation property to figure out which way the device is oriented  With Android phones  screen width or screen height also updates as the device is rotated   this is not the case with the iPhone

User · Answer

A little contribution to the two-bit-fool s answer   As described on the table on droid phones  orientationchange  event gets fired earlier than  resize  event thus blocking the next resize call  because of the if statement   Width property is still not set   A workaround though maybe not a perfect one could be to not fire the  orientationchange  event  That can be archived by wrapping  orientationchange  event binding in  if  statement   if   navigator userAgent match  android i         window addEventListener  orientationchange   checkOrientation  false       Hope it helps   tests were done on Nexus S

User · Answer

Here is the solution   var isMobile         Android  function             return  Android i test navigator userAgent              iOS  function             return  iPhone iPad iPod i test navigator userAgent            if isMobile Android                  var previousWidth   window  width              window  on           resize  function e            var YourFunction  function                 var screenWidth   window  width                if previousWidth  screenWidth                                previousWidth screenWidth                  alert  oreientation changed                                                               else  mainly for ios                 window  on               orientationchange  function e                   alert  orientation changed

User · Answer

You could always listen to the window resize event  If  on that event  the window went from being taller than it is wide to wider than it is tall  or vice versa   you can be pretty sure the phone orientation was just changed

User · Answer

Another gotcha - some Android tablets  the Motorola Xoom I believe and a low-end Elonex one I m doing some testing on  probably others too  have their accelerometers set up so that window orientation    0 in LANDSCAPE mode  not portrait

User · Answer

I had the same problem  I am using Phonegap and Jquery mobile  for Adroid devices  To resize properly I had to set a timeout      window  bind  orientationchange  function e      fixOrientation           window  bind  resize  function e      fixOrientation         function fixOrientation          setTimeout function              var windowWidth   window innerWidth              div data-role  page     width windowWidth              div data-role  header     width windowWidth              div data-role  content     width windowWidth-30              div data-role  footer     width windowWidth          500

User · Answer

you can try the solution  compatible with all browser   Following is orientationchange compatibility pic   therefore  I author a orientaionchange polyfill  it is a based on  media attribute to fix orientationchange utility library      orientationchange-fix  window addEventListener  orientationchange   function     if window neworientation current      portrait landscape           do something          else          do something             false

User · Answer

The actual behavior across different devices is inconsistent  The resize and orientationChange events can fire in a different sequence with varying frequency  Also  some values  e g  screen width and window orientation  don t always change when you expect  Avoid screen width -- it doesn t change when rotating in iOS   The reliable approach is to listen to both resize and orientationChange events  with some polling as a safety catch   and you ll eventually get a valid value for the orientation  In my testing  Android devices occasionally fail to fire events when rotating a full 180 degrees  so I ve also included a setInterval to poll the orientation   var previousOrientation   window orientation  var checkOrientation   function        if window orientation     previousOrientation           previousOrientation   window orientation             orientation changed  do your magic here           window addEventListener  resize   checkOrientation  false   window addEventListener  orientationchange   checkOrientation  false        optional  Android doesn t always fire orientationChange on 180 degree turns setInterval checkOrientation  2000     Here are the results from the four devices that I ve tested  sorry for the ASCII table  but it seemed like the easiest way to present the results   Aside from the consistency between the iOS devices  there is a lot of variety across devices  NOTE  The events are listed in the order that they fired                                                                                           Device       Events Fired        orientation   innerWidth   screen width                                                                                      iPad 2           resize              0             1024         768               to landscape    orientationchange   90            1024         768             ---------------- ------------------- ------------- ------------ --------------    iPad 2           resize              90            768          768               to portrait     orientationchange   0             768          768             ---------------- ------------------- ------------- ------------ --------------    iPhone 4         resize              0             480          320               to landscape    orientationchange   90            480          320             ---------------- ------------------- ------------- ------------ --------------    iPhone 4         resize              90            320          320               to portrait     orientationchange   0             320          320             ---------------- ------------------- ------------- ------------ --------------    Droid phone      orientationchange   90            320          320               to landscape    resize              90            569          569             ---------------- ------------------- ------------- ------------ --------------    Droid phone      orientationchange   0             569          569               to portrait     resize              0             320          320             ---------------- ------------------- ------------- ------------ --------------    Samsung Galaxy   orientationchange   0             400          400              Tablet           orientationchange   90            400          400               to landscape    orientationchange   90            400          400                               resize              90            683          683                               orientationchange   90            683          683             ---------------- ------------------- ------------- ------------ --------------    Samsung Galaxy   orientationchange   90            683          683              Tablet           orientationchange   0             683          683               to portrait     orientationchange   0             683          683                               resize              0             400          400                               orientationchange   0             400          400             ---------------- ------------------- ------------- ------------ --------------

[javascript] Detect rotation of Android phone in the browser with JavaScript

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