Which technique is recommended for generating an XMLHttpRequest object?
The method should be compatible with all modern browsers.
Which technique is recommended for generating an XMLHttpRequest object?
The method should be compatible with all modern browsers.
If you're looking for a solution without using any external libraries, you can easily mimic Prototype's Try.these functionality with the following code:
function createHttpRequest() {
try { return new XMLHttpRequest(); } catch(){}
try { return new ActiveXObject('Msxml2.XMLHTTP.6.0'); } catch(){}
try { return new ActiveXObject('Msxml2.XMLHTTP.3.0'); } catch(){}
try { return new ActiveXObject('Msxml2.XMLHTTP'); } catch(){}
try { return new ActiveXObject('Microsoft.XMLHTTP'); } catch(){}
return false;
}
Check out this link for helpful information and some code snippets that cover various scenarios:
var request = null;
function InitializeXMLRequest()
{
var xmlObj = null;
var ProgID = ["Msxml2.XMLHTTP.6.0", "Msxml2.XMLHTTP.3.0", "Microsoft.XMLHTTP"];
try
{
xmlObj = new XMLHttpRequest();
}
catch(e)
{
for (var i = 0; i < ProgID.length; i++)
{
try
{
xmlObj = new ActiveXObject(ProgID[i]);
}
catch(e)
{
continue;
}
}
}
return xmlObj;
}
request = InitializeXMLRequest();
Utilize the power of jQuery or a similar JavaScript library to streamline the process of handling cross-browser compatibility challenges, specifically when making Ajax calls.
As demonstrated in this example, take advantage of the jQuery Ajax call for efficient execution:
$.ajax({
url: 'document.xml',
type: 'GET',
dataType: 'xml',
timeout: 1000,
error: function(){
alert('Error loading XML document');
},
success: function(xml){
// process xml data
}
});
For a solution, you could consider following Sergey's recommendation or creating a simple patch for IE on your own:
if(typeof window.XMLHttpRequest === 'undefined' &&
typeof window.ActiveXObject === 'function') {
window.XMLHttpRequest = function() {
try { return new ActiveXObject('Msxml2.XMLHTTP.6.0'); } catch(e) {}
try { return new ActiveXObject('Msxml2.XMLHTTP.3.0'); } catch(e) {}
return new ActiveXObject('Microsoft.XMLHTTP');
};
}
Once that is done, you can use
var req = new XMLHttpRequest;
even in IE.
update 2011-02-18: refer to this blogpost for insights into the reasoning behind the new selection of MSXML versions...
When it comes to incorporating Ajax into your web development projects, utilizing an established JavaScript library is typically more efficient than creating your own Ajax framework from scratch – unless that is your intention. Consider exploring popular options like jQuery, Prototype, MooTools, or Dojo to gain insights on best practices if you are determined to develop your own solution.
Utilize the XMLHttpRequest.js library for a standardized cross-browser implementation of the XMLHttpRequest object and interact with the object following the W3C standard
This piece of code is my tried and tested solution:
function fetchData()
{
try
{
try
{
return new ActiveXObject("Microsoft.XMLHTTP")
}
catch( error )
{
return new ActiveXObject("Msxml2.XMLHTTP")
}
}
catch(error)
{
return new XMLHttpRequest()
}
}
Cletus's recommendation to utilize jQuery is spot on, and I highly recommend exploring the jQuery Form plugin. It's incredibly robust and user-friendly, making it a breeze to seamlessly transition your forms to function with Ajax.
function GenerateXmlHttpRequest() {
try {
XmlHttpRequestObj = new ActiveXObject("Msxml2.XMLHTTP");
}
catch (error) {
try {
XmlHttpRequestObj = new ActiveXObject("Microsoft.XMLHTTP");
}
catch (exception) {
XmlHttpRequestObj = null;
}
}
// if unable to generate using IE specific code then attempt generating for Mozilla (FireFox)
if (!XmlHttpRequestObj && typeof XMLHttpRequest != "undefined") {
XmlHttpRequestObj = new XMLHttpRequest();
}
}
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