Firefox seems to handle webpages smoothly, whereas IE struggles to display them properly

Check out the code snippet below:

self.xmlHttpReq = new XMLHttpRequest();

  self.xmlHttpReq.onreadystatechange = function()
  {
    if(self.xmlHttpReq.readyState == 4 && self.xmlHttpReq.status == 200)
    {
      xmlDoc = self.xmlHttpReq.responseXML;
      var xmlVar1 = xmlDoc.getElementsByTagName('var1')[0].childNodes[0].nodeValue;
      var xmlVar2 = xmlDoc.getElementsByTagName('var2')[0].childNodes[0].nodeValue;
    }
  }

A mysterious error message appears in Internet Explorer:

An object is required, ajax request.js line number, character number

Surprisingly, this same ajax request functions perfectly in Firefox.

javascriptajax

Answer №1

Each browser, like IE and Firefox, uses different object names for the XMLHttpRequest. Therefore, it is important to determine your specific browser and declare the appropriate object based on that information.

You can try using a function like the one below:

function getXHR() {
    var xhr = false;
    if (window.XMLHttpRequest) {
        xhr = new XMLHttpRequest();
    } else if (window.ActiveXObject) {
        try {
            xhr = new ActiveXObject("msxml2.XMLHTTP");
        } catch(e) {
            try {
                xhr = new ActiveXObject("Microsoft.XMLHTTP");
            } catch (e) {
                xhr = false;
            }
        }
    }
    return xhr;
}

I first came across this code from Jeremy Keith some time back, and it has always worked flawlessly for me.

Answer №2

If you are working with Internet Explorer, keep in mind that it does not support the XMLHttpRequest object like other browsers do. Instead, IE uses an ActiveX object to achieve similar functionality. Therefore, you will need to adjust the following line of code:

self.xmlHttpReq = new XMLHttpRequest();

To something like this:

if (window.ActiveXObject) {
    try {
        self.xmlHttpReq = new ActiveXObject('Microsoft.XMLHTTP');
    }
    catch (e) {
        self.xmlHttpReq = new ActiveXObject('Msxml2.XMLHTTP'); // for really old versions of IE. You can leave the try/catch out if you don't care to support browsers from the '90s.
    }
}
else
    self.xmlHttpReq = new XMLHttpRequest();

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