Ajax i Glupi IE7

Code:

<script type="text/javascript">
// <![CDATA[

//-----------------------------------------------------------------------------
// Define some constants.
//-----------------------------------------------------------------------------

// Define a list of Microsoft XML HTTP ProgIDs.
var XMLHTTPREQUEST_MS_PROGIDS = new Array(
    "Msxml2.XMLHTTP.7.0",
    "Msxml2.XMLHTTP.6.0",
    "Msxml2.XMLHTTP.5.0",
    "Msxml2.XMLHTTP.4.0",
    "MSXML2.XMLHTTP.3.0",
    "MSXML2.XMLHTTP",
    "Microsoft.XMLHTTP"
);

// Define ready state constants.
var XMLHTTPREQUEST_READY_STATE_UNINITIALIZED = 0;
var XMLHTTPREQUEST_READY_STATE_LOADING       = 1;
var XMLHTTPREQUEST_READY_STATE_LOADED        = 2;
var XMLHTTPREQUEST_READY_STATE_INTERACTIVE   = 3;
var XMLHTTPREQUEST_READY_STATE_COMPLETED     = 4;

//-----------------------------------------------------------------------------
// Returns an XMLHttpRequest object.
//-----------------------------------------------------------------------------
function getXMLHttpRequest()
{
    var httpRequest = null;

    // Create the appropriate HttpRequest object for the browser.
    if (window.XMLHttpRequest != null)
        httpRequest = new window.XMLHttpRequest();
    else if (window.ActiveXObject != null)
    {
        // Must be IE, find the right ActiveXObject.
        var success = false;
        for (var i = 0; i < XMLHTTPREQUEST_MS_PROGIDS.length && !success; i++)
        {
            try
            {
                httpRequest = new ActiveXObject(XMLHTTPREQUEST_MS_PROGIDS[i]);
                success = true;
            }
            catch (ex)
            {}
        }
    }

    // Display an error if we couldn't create one.
    if (httpRequest == null)
        alert("Error in HttpRequest():\n\nCannot create an XMLHttpRequest object.");

    // Return it.
    return httpRequest;
}



//-----------------------------------------------------------------------------
// This code uses an XMLHttpRequest object to look up the high school of the
// county entered by the user. That data is then used to populate the
// corresponding form fields.
//-----------------------------------------------------------------------------


var highSchoolLookup = getXMLHttpRequest();

function initiateHighSchoolLookup(event)
{
    
  // Check for a city and state.
  var county  = document.MForm.COUNTY.value;
  
  // Abort any currently active request.
  //highSchoolLookup.abort();
  
  // Clear the high school drop-down list.
    while (document.MForm.elements["highSchoolList"].options.length > 0)
        document.MForm.elements["highSchoolList"].remove(0);

  // Perform an asynchronous request to get a list of zip codes for
  // that city and state.
  var url = "servlet/HS_by_COUNTY?COUNTY=" + encodeURI(county) + "&HS=03020&arr=1297";
  
  highSchoolLookup.onreadystatechange = highSchoolReadyStateChange;
  highSchoolLookup.open("GET", url, true);
  highSchoolLookup.send(null);
}


function highSchoolReadyStateChange()
{
    var statusText;

    // Check the ready state.
    switch (highSchoolLookup.readyState)
    {
        case XMLHTTPREQUEST_READY_STATE_UNINITIALIZED:
            statusText = "";
            break;

        case XMLHTTPREQUEST_READY_STATE_LOADING:
            statusText = "Initialzing High School lookup...";
            break;

        case XMLHTTPREQUEST_READY_STATE_LOADED:
            statusText = "Sending data...";
            break;

        case XMLHTTPREQUEST_READY_STATE_INTERACTIVE:
            statusText = "Downloading data...";
            break;

        case XMLHTTPREQUEST_READY_STATE_COMPLETED:

            // Assume no matches were found.
            statusText = "No High Schools found."

            
            // Get the XML document returned from the request and fill in the
            // form fields.
            try
            {
                var xmlDoc = highSchoolLookup.responseXML;

                // Copy the county attributes from the root XML node to the appropriate form fields.
                var county  = xmlDoc.documentElement.getAttribute("county");
                
                
                // Get all the high school code tags returned from the request.
                var els = xmlDoc.getElementsByTagName("highSchool");

                // Set the status text.
                statusText = els.length + " High Schools found."

                // Add a dummy option to the high school drop-down list.
                var option = document.createElement("OPTION");
                option.text = "Select one...";
                option.value = "";
                try
                {
                    document.MForm.elements["highSchoolList"].add(option, null);
                }
                catch(ex)
                {
                    // For IE.
                    document.MForm.elements["highSchoolList"].add(option);
                }

                // Add an option to to the drop-down list for each high school returned from the request.
                for (var i = 0; i < els.length; i++)
                {
                    option = document.createElement("OPTION");
                    option.text = option.value = els[i].firstChild.nodeValue;
                    try
                    {
                        document.MForm.elements["highSchoolList"].add(option, null);
                    }
                    catch(ex)
                    {
                        // For IE.
                        document.MForm.elements["highSchoolList"].add(option);
                    }
                }

                // Show the drop down list and set focus on it.
                document.MForm.elements["highSchoolList"].style.visibility = "";
                document.MForm.HS.style.visibility = "hidden";
                document.MForm.elements["highSchoolList"].focus();
            }
            catch (ex)
            {}
            break;

        default:
            statusText = "Unknown error.";
            break;
    }

    // Display the status message.
    setStatusText(statusText);
}
function setStatusText(text)
{
    // Display the status message.
    var el = document.getElementById("statusText");
    if (el.firstChild == null)
        el.appendChild(document.createTextNode(""));
    el.firstChild.nodeValue = text;
}
</script>

Code:

function createRequestObject() {
        var RequestObj;
        var browser = navigator.appName;
        if(browser == "Microsoft Internet Explorer") {
            RequestObj = new ActiveXObject("Microsoft.XMLHTTP");
        }
        else {
            RequestObj = new XMLHttpRequest();
        }
        return RequestObj;
    }

var http = createRequestObject();

Code:

// Abort any currently active request.
   highSchoolLookup.abort();