@tejaswigowda/simpleauth/public/asyncReq.js

Simple authentication using Node.js + Passport.js

/*
 * Make Asynchronous HTTP GET requests.
 * filename --> URL (route) you want to request
 * callback(data) --> gets called on response `data` that arrives
*/

function loadFile(filename, callback)
{
    var aXMLHttpRequest = getXMLHTTPRequest();
    var allData;

    if (aXMLHttpRequest)
    {
        aXMLHttpRequest.open("GET", filename, true);
        
      aXMLHttpRequest.onreadystatechange = function (aEvt) {
        if(aXMLHttpRequest.readyState == 4){
        allData = aXMLHttpRequest.responseText;
        callback(allData)
        }
      };
      
      //Lets fire off the request
        aXMLHttpRequest.send(null);
    }
    else
    {
        //Oh no, the XMLHttpRequest object couldn't be instantiated.
        alert("A problem occurred instantiating the XMLHttpRequest object.");
    }
}

function getXMLHTTPRequest()
{
    var request;
    // Lets try using ActiveX to instantiate the XMLHttpRequest object
    try{
        request = new ActiveXObject("Microsoft.XMLHTTP");
    }catch(ex1){
        try{
            request = new ActiveXObject("Msxml2.XMLHTTP");
        }catch(ex2){
            request = null;
        }
    }

    // If the previous didn't work, lets check if the browser natively support XMLHttpRequest 
    if(!request && typeof XMLHttpRequest != "undefined"){
        //The browser does, so lets instantiate the object
        request = new XMLHttpRequest();
    }

    return request;
}