No, you cannot use postBody to upload a file, at least not directly. The default postBody behaviour takes a query-string, which Form.serialize will get you. My patch is for if you need to send a multi-part body for some reason. It can also be used to take an arbitrary object and post it's properties without having to serialize, but that's kind of a fringe benefit.

You could probably use it to upload a file, but you'd have to get the file content into a JS variable, which would be difficult at best. Well, not difficult, but it would entail a lot of limitations (like browsers have to allow native access to JS code, which no one in the right mind would ever do).

Is this right?

new Ajax.Request(url, {
asynchronous : true,
method : "post",
postBody : Form.getInputs(formName),
onSuccess : function(request)
{ alert("success");},
onFialure: function(request)
{ alert("fail");}
});

Is this right?

new Ajax.Request(url, {
asynchronous : true,
method : "post",
postBody : Form.getInputs(formName),
onSuccess : function(request)
{ alert("success");},
onFialure: function(request)
{ alert("fail");}
});