How do I stop my fixed navigation from moving like this when the virtual keyboard opens in Mobile Safari?

I understand that mobile safari has a lot of bugs around fixed elements, but for the most part I've managed to get my layout working correctly until I added a much needed text input to the fixed navigation at the bottom. Now when the user focuses on the text input element and the virtual keyboard appears, my navigation, which is otherwise always fixed at the bottom of the page, jumps up to a really strange spot in the middle of the page.

I'd add some of my code to this post, but I wouldn't be sure where to start. That navigation is fixed at the bottom and positioned to the left and bottom 0, and 100% width. From there, I don't know what's going on, I can only assume it's a mobile safari bug.

It also appears to lose it's position fixed and become relative, only while the text input element is focused on and the virtual keyboard is open.

http://dansajin.com/2012/12/07/fix-position-fixed/ this is one of the solutions proposed. Seems worth a shot.

In short: set fixed elements to position:absolute when any input is focused and reset them when that element is blurred

.header { 
    position: fixed; 
} 
.footer { 
    position: fixed; 
} 
.fixfixed .header, 
.fixfixed .footer { 
    position: absolute; 
} 

and

if ('ontouchstart' in window) {
    /* cache dom references */ 
    var $body = $('body'); 

    /* bind events */
    $(document)
    .on('focus', 'input', function() {
        $body.addClass('fixfixed');
    })
    .on('blur', 'input', function() {
        $body.removeClass('fixfixed');
    });
}

The solutions on the top are some ways to go and fix the problem, but I think adding extra css class or using moderniz we are complicating things.

If you want a more simple solution, here is a non-modernizr non-extra-css but pure jquery solution and work on every device and browsers I use this fix on all my projects

if ('ontouchstart' in window) {
    $(document).on('focus', 'textarea,input,select', function() {
        $('.navbar.navbar-fixed-top').css('position', 'absolute');
    }).on('blur', 'textarea,input,select', function() {
        $('.navbar.navbar-fixed-top').css('position', '');
    });
}

I had a similar problem, but I found a workaround by adding the following css class to the body element on input focus and then removing it again on unfocus:

.u-oh {
    overflow: hidden;
    height: 100%;
    width: 100%;
    position: fixed;
}

Taking from what sylowgreen did, the key is to fix the body on entering the input. Thus:

$("#myInput").on("focus", function () {
    $("body").css("position", "fixed");
});

$("#myInput").on("blur", function () {
    $("body").css("position", "static");
});

Add javascript like this:

$(function() {
  var $body;
  if ('ontouchstart' in window) {
    $body = $("body");
    document.addEventListener('focusin', function() {
      return $body.addClass("fixfixed");
    });
    return document.addEventListener('focusout', function() {
      $body.removeClass("fixfixed");
      return setTimeout(function() {
        return $(window).scrollLeft(0);
      }, 20);
    });
  }
});

and add class like this:

.fixfixed header{ 
    position: absolute; 
} 

you can reference this article: http://dansajin.com/2012/12/07/fix-position-fixed/