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cross browser XMLHttpRequest
Posted by Erik on Oct 29 2005 @ 20:19 :: 7510 unique visits
With AJAX programming being so populair these days I thought I post this.CODE: JAVASCRIPT
function createXMLHttpRequest() {
var types = [
'Microsoft.XMLHTTP',
'MSXML2.XMLHTTP.5.0',
'MSXML2.XMLHTTP.4.0',
'MSXML2.XMLHTTP.3.0',
'MSXML2.XMLHTTP'
];
for (var i = 0; i < types.length; i++) {
try {
return new ActiveXObject(types[i]);
} catch(e) {}
}
try {
return new XMLHttpRequest();
} catch(e) { }
return false; // XMLHttpRequest not supported
}
var types = [
'Microsoft.XMLHTTP',
'MSXML2.XMLHTTP.5.0',
'MSXML2.XMLHTTP.4.0',
'MSXML2.XMLHTTP.3.0',
'MSXML2.XMLHTTP'
];
for (var i = 0; i < types.length; i++) {
try {
return new ActiveXObject(types[i]);
} catch(e) {}
}
try {
return new XMLHttpRequest();
} catch(e) { }
return false; // XMLHttpRequest not supported
}
Modified the function after guest posting.
You can also use this code to add a XMLHttpRequest to IE so you can just use
new XMLHttpRequest(); as in other browsers.
CODE: JAVASCRIPT
if (!window.XMLHttpRequest) {
window.XMLHttpRequest = function() {
var types = [
'Microsoft.XMLHTTP',
'MSXML2.XMLHTTP.5.0',
'MSXML2.XMLHTTP.4.0',
'MSXML2.XMLHTTP.3.0',
'MSXML2.XMLHTTP'
];
for (var i = 0; i < types.length; i++) {
try {
return new ActiveXObject(types[i]);
} catch(e) {}
}
return false; // XMLHttpRequest not supported
}
}
window.XMLHttpRequest = function() {
var types = [
'Microsoft.XMLHTTP',
'MSXML2.XMLHTTP.5.0',
'MSXML2.XMLHTTP.4.0',
'MSXML2.XMLHTTP.3.0',
'MSXML2.XMLHTTP'
];
for (var i = 0; i < types.length; i++) {
try {
return new ActiveXObject(types[i]);
} catch(e) {}
}
return false; // XMLHttpRequest not supported
}
}
28 comments posted so far
Add your own »
2. On Oct 30 2005 @ 00:03 Erik wrote:
lol, no I can't (this link will). But if you don't know what an XMLHttpRequest does you will probably never need this code.3. On Nov 19 2005 @ 10:51 guest wrote:
I think this version works better and is more stable:CODE: JAVASCRIPT
function createXMLHttpRequest()
{
// Create and initialise the temporary variable
var http_request = false;
// This check is for Mozilla, Safari, Opera,...
if (window.XMLHttpRequest)
{
try
{
http_request = new XMLHttpRequest();
if (http_request.overrideMimeType)
{
http_request.overrideMimeType('text/xml');
}
}
catch (e)
{
http_request = false;
}
}
// For Internet Explorer
else
{
try
{
http_request = new ActiveXObject("Msxml2.XMLHTTP");
}
catch (e)
{
try
{
http_request = new ActiveXObject("Microsoft.XMLHTTP");
}
catch (e)
{
http_request = false;
}
}
}
return (http_request != null && http_request != false) ? http_request : false;
}
{
// Create and initialise the temporary variable
var http_request = false;
// This check is for Mozilla, Safari, Opera,...
if (window.XMLHttpRequest)
{
try
{
http_request = new XMLHttpRequest();
if (http_request.overrideMimeType)
{
http_request.overrideMimeType('text/xml');
}
}
catch (e)
{
http_request = false;
}
}
// For Internet Explorer
else
{
try
{
http_request = new ActiveXObject("Msxml2.XMLHTTP");
}
catch (e)
{
try
{
http_request = new ActiveXObject("Microsoft.XMLHTTP");
}
catch (e)
{
http_request = false;
}
}
}
return (http_request != null && http_request != false) ? http_request : false;
}
4. On Nov 21 2005 @ 16:56 guest wrote:
hehe, the function in the startpost will also work correctly and maybe better, because return wil exit the function after it's called, so he won't reach te next line. ;)5. On Dec 13 2005 @ 17:36 guest wrote:
I think this a better one:CODE: JAVASCRIPT
if (!window.XMLHttpRequest)
{
window.XMLHttpRequest = function()
{
var types = [
'Microsoft.XMLHTTP',
'MSXML2.XMLHTTP.5.0',
'MSXML2.XMLHTTP.4.0',
'MSXML2.XMLHTTP.3.0',
'MSXML2.XMLHTTP'
];
for (var i = 0; i < types.length; i++)
{
try
{
return new ActiveXObject(types[i]);
}
catch(e) {}
}
return undefined;
}
}
{
window.XMLHttpRequest = function()
{
var types = [
'Microsoft.XMLHTTP',
'MSXML2.XMLHTTP.5.0',
'MSXML2.XMLHTTP.4.0',
'MSXML2.XMLHTTP.3.0',
'MSXML2.XMLHTTP'
];
for (var i = 0; i < types.length; i++)
{
try
{
return new ActiveXObject(types[i]);
}
catch(e) {}
}
return undefined;
}
}
6. On Dec 14 2005 @ 18:40 Erik wrote:
Looks interresting. I will do some tests with this and then probably modify the code I submitted.7. On Dec 14 2005 @ 23:09 Erik wrote:
Found some problems today. When XMLHttpRequest is not supported createXMLHttpRequest returns null. But when you compare the result to null you will get an error in IE (not in firefox).CODE: JAVASCRIPT
var req = createXMLHttpRequest();
if (req == null) { // error here
...
if (req == null) { // error here
...
I have fixed this by letting the function return false and doing the check like this:
CODE: JAVASCRIPT
var req = createXMLHttpRequest();
if (typeof req == 'boolean') { // error here
...
if (typeof req == 'boolean') { // error here
...
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1. On Oct 29 2005 @ 21:17 Bhav wrote:
um could you explain what that means/does for us n00bs? ;)