Currently, it seems that it's not possible to abort an ajax request.
If an already occurring request is aborted, an error is thrown in both
firefox and internet explorer (I don't have safari or opera to test
with those browsers). In order to be able to abort the request, I
rewrote the respondToReadyState function like this:
Object.extend(Ajax.Request.prototype, {
respondToReadyState: function(readyState) {
var state = Ajax.Request.Events[readyState];
var transport = this.transport, json = this.evalJSON();
var aborted = false;
if (state == 'Complete') {
try {
// raise an exception when transport is abort()ed
if (transport.status) 1;
} catch (e) {
aborted = true;
}
}
if (state == 'Complete' && !aborted) {
try {
this._complete = true;
(this.options['on' + this.transport.status]
|| this.options['on' + (this.success() ? 'Success' :
'Failure')]
|| Prototype.emptyFunction)(transport, json);
} catch (e) {
this.dispatchException(e);
}
var contentType = this.getHeader('Content-type');
if (contentType && contentType.strip().
match(/^(text|application)\/(x-)?(java|ecma)script(;.*)?$/i))
this.evalResponse();
}
try {
(this.options['on' + state] || Prototype.emptyFunction)
(transport, json);
Ajax.Responders.dispatch('on' + state, this, transport, json);
} catch (e) {
this.dispatchException(e);
}
if (state == 'Complete' && !aborted) {
// avoid memory leak in MSIE: clean up
this.transport.onreadystatechange = Prototype.emptyFunction;
}
}
});
perhaps it would be better if this was included in prototype.
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