Identifying user device type

gistfile1.html

<span id="txtDevice"></span>

<script>
var deviceDetector=function(){var b=navigator.userAgent.toLowerCase(),a=function(a){void 0!==a&&(b=a.toLowerCase());return/(ipad|tablet|(android(?!.*mobile))|(windows(?!.*phone)(.*touch))|kindle|playbook|silk|(puffin(?!.*(IP|AP|WP))))/.test(b)?"tablet":/(mobi|ipod|phone|blackberry|opera mini|fennec|minimo|symbian|psp|nintendo ds|archos|skyfire|puffin|blazer|bolt|gobrowser|iris|maemo|semc|teashark|uzard)/.test(b)?"phone":"desktop"};return{device:a(),detect:a,isMobile:"desktop"!=a()?!0:!1,userAgent:b}}();
</script>

<script>
var device = "";
document.addEventListener("DOMContentLoaded", function(event) { 
  if(deviceDetector.device == 'desktop') {
	if (navigator.appVersion.indexOf("Win")!=-1) device="PC";
	else if (navigator.appVersion.indexOf("Mac")!=-1) device="Mac";
	else if (navigator.appVersion.indexOf("X11")!=-1) device="UNIX";
	else if (navigator.appVersion.indexOf("Linux")!=-1) device="Linux";
  } else{
    if(deviceDetector.device == 'tablet')
       device="tablet";
    else
       device="smartphone";
  }

  document.getElementById("txtDevice").innerHTML = device;
});

</script>