Inquiry regarding the compatibility of AJAX with IE and cross-browser ActiveXObject capabilities

Hello, I am new to the world of AJAX and had a question that I couldn't find an answer to online, so I decided to ask here. My initial query relates to the snippet of code provided below.

function createXHR() {
  var iexhr...;

  iexhr = ["MSXML2.XMLHttp.7.0", "MSXML2.XMLHttp.6.0", "MSXML2.XMLHttp.5.0", "MSXML2.XMLHttp.4.0", "MSXML2.XMLHttp.3.0", "MSXML2.XMLHttp", "MSXML3.XMLHttp", "Microsoft.XMLHttp"];
}

I am curious about the code above. As I was conducting research and exploring various samples of code online, I noticed that different versions of XMLHttpRequest were being used. I want to develop a cross-browser XHR solution and wondered whether it is necessary to include all these versions or if only one version would suffice?

javascriptajaxinternet-explorercross-browser

Answer №1

It is not advisable to use any of those options.

When it comes to XHRs, there are essentially two versions that you should be aware of: 

window.ActiveXObject( "Microsoft.XMLHTTP")
for older versions of Internet Explorer and window.XMLHttpRequest() for modern browsers.

A common method used is as follows:

if(window.XMLHttpRequest){
    return new window.XMLHttpRequest();
} 
else {
    return new window.ActiveXObject( "Microsoft.XMLHTTP" );
}

Of course, the implementation may vary depending on your specific requirements.

However, XHR involves much more than simply returning Objects; tasks like monitoring state and handling errors are essential considerations which is why many opt to use libraries for these functionalities. It's best not to try and reinvent the wheel.

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