JavaScript Snippet to be put at bottom of the body, which will fix links including rails UJS links for WebApps ran from the iOS home screen.

ios-standalone-rails.js

if(("standalone" in window.navigator) && window.navigator.standalone){

  var noddy, remotes = false;

  var iosClickFixer = function(event) {
    noddy = event.target;
    while(noddy.nodeName !== "A" && noddy.nodeName !== "HTML") {
      noddy = noddy.parentNode;
    }
    if('href' in noddy && noddy.href.indexOf('http') !== -1 && (noddy.href.indexOf(document.location.host) !== -1  && noddy.getAttribute("data-method") !== "post" && noddy.getAttribute("data-method") !== "delete" || remotes))
    {
      event.preventDefault();
      if(typeof(Turbolinks) !== "undefined"){
        Turbolinks.visit(noddy.href);
      } else {
        document.location.href = noddy.href;
      }
    }
  };
  document.addEventListener('click', iosClickFixer,false);
}