A resize event is triggered when a mobile browsers address bar drops down (when changing directions in a scroll). This will let you check for only width resizes. From http://stackoverflow.com/questions/10750603/jquery-detect-a-window-width-change-but-not-a-height-change

mobile-resize-check.js

var width = $(window).width();
$(window).resize(function(){
   if($(this).width() != width){
      width = $(this).width();
       console.log(width);
       // your code
   }
});

great, thanks!