Cors simple sample

index.js

function createCORSRequest(method, url) {
 var xhr = new XMLHttpRequest();
 if ("withCredentials" in xhr) {
// XHR for Chrome/Firefox/Opera/Safari.
 xhr.open(method, url, true);
 console.log('withCredentials') } else if (typeof XDomainRequest != "undefined") {
// XDomainRequest for IE.
 xhr = new XDomainRequest();
 xhr.open(method, url);
 } else {
// CORS not supported.
 xhr = null;
 }
 return xhr;
}

function makeCorsRequest() {
 var xhr = createCORSRequest('GET', url);
 if (!xhr) {
 alert('CORS not supported');
 return;
 }
 xhr.onload = function() {
 console.log("onloadn");
 }
xhr.onerror = function() {
 alert('Error accessing database.');
 };
 xhr.send();
}


$(document).ready(function() {
    // are we running in native app or in a browser?
    window.isphone = false;
    if(document.URL.indexOf("http://") === -1 
        && document.URL.indexOf("https://") === -1) {
        window.isphone = true;
    }

    if( window.isphone ) {
        document.addEventListener("deviceready", onDeviceReady, false);
    } else {
        onDeviceReady();
    }
});




function showMentors() {
// if (str=="") {
//if (str=="")
 // {
  //document.getElementById("txtHint").innerHTML = "";
  //return;
 // }

if (window.XMLHttpRequest)
  { 
  // code for IE7+, Firefox, Chrome, Opera, Safari
  xmlhttp=new XMLHttpRequest();
  }
else
  { // code for IE6, IE5
  xmlhttp=new ActiveXObject("Microsoft.XMLHTTP");
  }
xmlhttp.onreadystatechange=function()
  {
  if (xmlhttp.readyState==4 && xmlhttp.status==200)
    {
     //you can use JSON.parse(jsonobject_xmlresponseText) to ensure it is parsed as an json array. for example: .
          mentorList = JSON.parse(xmlhttp.responseText);
        
        var options = '';
        
          for(i=0; i <= mentorList.length - 1 ; i++)
          {
            var mentorId = mentorList[i].userid;
            console.log(mentorId);
            mentorName = mentorList[i].fullname;
            console.log(mentorName);
            options += '<option value="' + mentorId + '">' + mentorName + '</option>';
           console.log(options);
        }
        
     //document.getElementById("mentors_helptxt").innerHTML = xmlhttp.responseText;
    

    }
  }

// Pass the select option to PHP page

    xmlhttp.open("GET","http://www.mentorsdojo.com/mentors/?json",true);
    xmlhttp.send();
 }
//sample plain string parse and put into innerHTML
function showUser(str)
{
if (str=="")
  {
  document.getElementById("txtHint").innerHTML = "";
  return;
  }
if (window.XMLHttpRequest)
  { // code for IE7+, Firefox, Chrome, Opera, Safari
  xmlhttp=new XMLHttpRequest();
  }
else
  { // code for IE6, IE5
  xmlhttp=new ActiveXObject("Microsoft.XMLHTTP");
  }
xmlhttp.onreadystatechange=function()
  {
  if (xmlhttp.readyState==4 && xmlhttp.status==200)
    {
    document.getElementById("txtHint").innerHTML = xmlhttp.responseText;
    }
  }

// Pass the select option to PHP page
    xmlhttp.open("GET","http://www.myDomain.com/getcars.php?q="+str,true);
    xmlhttp.send();
}


// Start the CORS on startup
var url = "http://www.mentorsdojo.com/";
var method = "GET";
createCORSRequest(method, url);
showMentors();