How to prevent iOS keyboard from pushing the view off screen with CSS or JS

first

<script type="text/javascript">
 $(document).ready(function() {
     document.ontouchmove = function(e){
          e.preventDefault();
          }
 });

then this

input.onfocus = function () {
    window.scrollTo(0, 0);
    document.body.scrollTop = 0;
}