Hello everbody!
I want to tell you about a "funny" error I've found making an
Ajax.Request with Internet Explorer 7 and Prototype 1.7.
Please. considering this very standard code:
function ajaxCall(url, callbackResponse) {
try{
new Ajax.Request(url, {
method: 'get',
asynchronous: true,
onSuccess: function(transport) {
callbackResponse_1();
callbackResponse_2();
}
});
} catch (exception) {
alert(exception.inspect());
}
}
When trying to execute those lines the Ajax.Request never happened,
not only the callback method, even the very first
"transport.send(url)" never starts. Googling and debugging a bit, I've
found out the root of my problem:
Basically the cause of bug is the well know poor designed
XMLHttpRequest implementation of IE7 which is really buggy ad won't
work as we expected. Anyway there's is also a prototype issue. In fact
in version 1.7 sources there are these lines of code:
var Ajax = {
getTransport: function() {
return Try.these(
function() {return new XMLHttpRequest()},
<-------------------------------
function() {return new ActiveXObject('Msxml2.XMLHTTP')},
function() {return new ActiveXObject('Microsoft.XMLHTTP')}
) || false;
},
[......]
that try to create XMLHttpRequest object in a "browser-compatibility"
way. Anyway because IE7 supports XMLHttpRequest, but it's buggy, those
lines force it to use a buggy implementation instead of less-good-but-
working Activex one.
I wouldn't call it a "prototype bug" but it's a fact that at least one
old version (I've seen it on 1.4) had a slightly different
implementation:
var Ajax = {
getTransport: function() {
return Try.these(
function() {return new ActiveXObject('Msxml2.XMLHTTP')},
function() {return new ActiveXObject('Microsoft.XMLHTTP')},
function() {return new XMLHttpRequest()}
<-------------------------------
) || false;
},
which perfectly works with different browser (IE 7/8, FF3, Chrome for
sure).
I hope that my post will be of help for someone else.
Best Regards.
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