Different Methods for Establishing XMLHttpRequests

I'm currently diving into the world of AJAX and looking into different methods of creating HttpRequests. So far, I've brainstormed a few approaches:

function one() {
if(window.XMLHttpRequest) {
    xhr = new XMLHttpRequest();
    alert('Other');
} else if (window.ActiveXObject) {
    xhr = new ActiveXObject("Microsoft.XMLHTTP");
    alert('windows');
}
return xhr;
}


function two() {
    if(window.XMLHttpRequest) {
        xhr = new XMLHttpRequest();
        alert('Other');
    } else if (!window.XMLHttpRequest) {
        xhr = new ActiveXObject('Microsoft.XMLHTTP');
        alert('windows');
    }
    return xhr;
}

function three() {
    if (window.XMLHttpRequest) {
        xhr = new XMLHttpRequest();
        alert('Other');
    } else {
        xhr = new ActiveXObject();
        alert('windows');
    }
    return xhr;
}

function four() {
    try {
        xhr = new XMLHttpRequest();
        alert('Other');
    } catch (e) {
        xhr = new ActiveXObject();
        alert('windows');
    }
    return xhr;
}

If there are any alternative ways to create this request that anyone would like to share, I would greatly appreciate it! One thing I love about JavaScript is its versatility in achieving tasks, so exploring all options is something I enjoy.

Answer №1

When it comes to finding effective solutions, I typically rely on jQuery.

// Functions for generating xhrs
function createStandardXHR() {
    try {
        return new window.XMLHttpRequest();
    } catch( e ) {}
}

function createActiveXHR() {
    try {
        return new window.ActiveXObject( "Microsoft.XMLHTTP" );
    } catch( e ) {}
}

// Creating the request object
// (Still attached to ajaxSettings for backward compatibility)
jQuery.ajaxSettings.xhr = window.ActiveXObject ?
/* Microsoft failed to properly
* implement the XMLHttpRequest in IE7 (can't request local files),
* so we use the ActiveXObject when it is available
* Additionally XMLHttpRequest can be disabled in IE7/IE8 so
* we need a fallback.
*/
function() {
return !this.isLocal && createStandardXHR() || createActiveXHR();
} :
// For all other browsers, use the standard XMLHttpRequest object
createStandardXHR;

Source

Answer №2

function getXMLHttpRequest() {
  try {
    return new XMLHttpRequest(); 
  } catch (error) // Catch any errors related to XMLHttpRequest
    return new window.ActiveXObject("Microsoft.XMLHTTP");
  }
}

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