how to properly display an iFrame in mobile safari

Question

I m trying to display an iframe in my mobile web application  but I m having trouble restricting the size of the iframe to the dimensions of the iPhone screen  The height and width attributes on the iframe element seem to have no effect  strangely  Surrounding it with a div manages to constrain it  but then I m unable to scroll within the iframe   Has anyone tackled iframes in mobile safari before  Any ideas where to start

User · Answer

This only works if you control both the outside page and the iframe page.

On the outside page, make the iframe unscrollable.

<iframe src="" height=200 scrolling=no></iframe>

On the iframe page, add this.

<!doctype html>
...
<style>
html, body {height:100%; overflow:hidden}
body {overflow:auto; -webkit-overflow-scrolling:touch}
</style>

This works because modern browsers uses html to determine the height, so we just give that a fixed height and turn the body into a scrollable node.

User · Answer

I have put  Sharon s code together into the following  which works for me on the iPad with two-finger scrolling  The only thing you should have to change to get it working is the src attribute on the iframe  I used a PDF document     lt  DOCTYPE html PUBLIC  -  W3C  DTD XHTML 1 0 Transitional  EN   http   www w3 org TR xhtml1 DTD xhtml1-transitional dtd  gt    lt html xmlns  http   www w3 org 1999 xhtml  gt   lt head gt       lt title gt Pdf Scrolling in mobile Safari lt  title gt   lt  head gt   lt body gt   lt div id  scroller  style  height  400px  width  100   overflow  auto   gt   lt iframe height  100   id  iframe  scrolling  no  width  100   id  iframe  src  data testdocument pdf    gt   lt  div gt   lt script type  text javascript  gt      setTimeout function              var startY   0          var startX   0          var b   document body          b addEventListener  touchstart   function  event                parent window scrollTo 0  1               startY   event targetTouches 0  pageY              startX   event targetTouches 0  pageX                      b addEventListener  touchmove   function  event                event preventDefault                var posy   event targetTouches 0  pageY              var h   parent document getElementById  scroller                var sty   h scrollTop               var posx   event targetTouches 0  pageX              var stx   h scrollLeft              h scrollTop   sty -  posy - startY               h scrollLeft   stx -  posx - startX               startY   posy              startX   posx                     1000        lt  script gt   lt  body gt   lt  html gt

User · Answer

Sharon s method worked for me  however when a link in the iframe is followed and then the browser back button is pressed  the cached version of the page is loaded and the iframe is no longer scrollable   To overcome this I used some code to refresh the page as follows   if   ontouchstart  in document documentElement                 document getElementById  Scrolling   src   document getElementById  SCrolling   src

User · Answer

The solution is to use Scrolling  no  on the iframe   That s it

User · Answer

I implemented the following and it works well   Basically  I set the body dimensions according to the size of the iFrame content   It does mean that our non-iFrame menu can be scrolled off the screen  but otherwise  this makes our sites functional with iPad and iPhone    workbox  is the ID of our iFrame      Configure for scrolling peculiarities of iPad and iPhone  if  navigator userAgent indexOf  iPhone      -1    navigator userAgent indexOf  iPad      -1        document body style width    100        document body style height    100            workbox   load function        Wait until iFrame content is loaded before checking dimensions of the content         iframeWidth       workbox   contents   width            if  iframeWidth  gt  400             document body style width    iframeWidth   182     px            iframeHeight       workbox   contents   height            if  iframeHeight gt 200              document body style height   iframeHeight    px

User · Answer

lt div id  scroller  style  height  400px  width  100   overflow  auto   gt   lt iframe height  100   id  iframe  scrolling  no  width  100   src  url    gt   lt  div gt    I m building my first site and this helped me get this working for all sites that I use iframe embededding for    Thanks

User · Answer

Don t scroll the IFrame page or its content  scroll the parent page  If you control the IFrame content  you can use the iframe-resizer library to turn the iframe element itself into a proper block level element  with a natural correct native height  Also  don t attempt to position  fixed  absolute  your iframe in the parent page  or present an iframe in a modal window  especially if it has form elements   I also suspect that iOS Safari has a non-standards behavior that expands your iframe s height to its natural height  much like the iframe-resizer library will do for desktop browsers  which seem to render responsive iframe content at height 0px or 150px or some other not useful default  If you need to contrain width  try a max-width style inside the iframe

User · Answer

Purely using MSchimpf and Ahmad s code  I made adjustments so I could have the iframe within a div  therefore keeping a header and footer for back button and branding on my page  Updated code    lt script type  text javascript  gt          webview   bind  pagebeforeshow   function event               iframe   attr  src  cwebview                if  navigator userAgent indexOf  iPhone      -1    navigator userAgent indexOf  iPad      -1                    webview-content   css  width   100                 webview-content   css  height   100                 iframe   load function        Wait until iFrame content is loaded before checking dimensions of the content             iframeWidth       iframe   contents   width                if  iframeWidth  gt  400                     webview-content   css  width   iframeWidth   182     px                 iframeHeight       iframe   contents   height                if  iframeHeight gt 200                      webview-content   css  height  iframeHeight    px                               lt  script gt      and the html   lt div class  header  data-role  header  data-position  fixed  gt   lt  div gt    lt div id  webview-content  data-role  content  style  height 380px   gt       lt iframe id  iframe  gt  lt  iframe gt      lt  div gt  lt  --  content -- gt    lt div class  footer  data-role  footer  data-position  fixed  gt   lt  div gt  lt  --  footer -- gt

User · Answer

If the iFrame content is not yours then the solution below will not work   With Android all you need to do is to surround the iframe with a DIV and set the height on the div to document documentElement clientHeight   IOS  however  is a different animal   Although I have not yet tried Sharon s solution it does seem like a good solution   I did find a simpler solution but it only works with IOS 5     Surround your iframe element with a DIV  lets call it scroller   set the height of the DIV and make sure that the new DIV has the following styling       scroller   css   overflow     auto    -webkit-overflow-scrolling     touch       This alone will work but you will notice that in most implementations the content in the iframe goes blank when scrolling and is basically rendered useless  My understanding is that this behavior has been reported as a bug to Apple as early as iOS 5 0  To get around that problem  find the body element in the iframe and add -webkit-transform    translate3d 0  0  0  like so       contentIframe   contents   find  body   css  -webkit-transform    translate3d 0  0  0       If your app or iframe is heavy on memory usage you might get a hitchy scroll for which you might need to use Sharon s solution

User · Answer

Yeah  you can t constrain the iframe itself with height and width   You should put a div around it   If you control the content in the iframe  you can put some JS within the iframe content that will tell the parent to scroll the div when the touch event is received     like this   The JS   setTimeout function      var startY   0  var startX   0  var b   document body  b addEventListener  touchstart   function  event        parent window scrollTo 0  1       startY   event targetTouches 0  pageY      startX   event targetTouches 0  pageX      b addEventListener  touchmove   function  event        event preventDefault        var posy   event targetTouches 0  pageY      var h   parent document getElementById  scroller        var sty   h scrollTop       var posx   event targetTouches 0  pageX      var stx   h scrollLeft      h scrollTop   sty -  posy - startY       h scrollLeft   stx -  posx - startX       startY   posy      startX   posx         1000     The HTML    lt div id  scroller  style  height  400px  width  100   overflow  auto   gt   lt iframe height  100   id  iframe  scrolling  no  width  100   id  iframe  src  url    gt   lt  div gt    If you don t control the iframe content  you can use an overlay over the iframe in a similar manner  but then you can t interact with the iframe contents other than to scroll it - so you can t  for example  click links in the iframe   It used to be that you could use two fingers to scroll within an iframe  but that doesn t work anymore   Update  iOS 6 broke this solution for us  I ve been attempting to get a new fix for it  but nothing has worked yet   In addition  it is no longer possible to debug javascript on the device since they introduced Remote Web Inspector  which requires a Mac to use

[css] how to properly display an iFrame in mobile safari

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