Rails spinoffs - Jan 2008 - Ajax Response responseXML is null in IE

This may be a Prototype question but is probably a general JavaScript
question.  I am creating an Ajax.Request and getting back a response
that should be evaluated as XML.  But in IE, in my onSuccess function,
the response.responseXML object is null.  In Firefox it works
properly.

I have checked the three things that are supposed to determine whether
the browser interprets the response text as XML:
the content-type is application/atom+xml,
the ready state is 4,
and if I open the requested URL in Internet Explorer, it shows the
page just fine, with no errors, so the XML must be well-formed.

But even with those three things true, the response text does not get
evaluated as XML and stuck into the responseXML object in IE!  I
haven''t found anything about this situation on the web, other than the
things I''ve already checked.

Anyone have any ideas?
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I found that if I use this code in my onSuccess function, I can force
it to work:

  updateOnSuccess : function(response) {
    if (Prototype.Browser.IE) {
      var d = new ActiveXObject("MSXML2.DOMDocument");
      d.loadXML(response.responseText);
      response.responseXML = d;
    }
...code to use response.responseXML ...

So I can force IE (I''m using IE7, forgot to say that originally) to
parse the XML and store it as a document, so it''s gotta be valid XML.
But the automatic processing that is supposed to happen with the
response is not happening.  I''d still like to understand why not, if
anyone has any ideas.




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As far as I can tell, it turns out that IE7 doesn''t follow the
specification for this part of the XMLHttpRequest object (which
admittedly is only a working draft).  Because I was able to get the
whole thing to work if I receive a response with a content-type of
text/xml.  My original response had a content-type of application/atom
+xml, which according to the spec, should get evaluated since it ends
in +xml.  But that doesn''t happen in IE7; it apparently requires the
text/xml type for it to work.

Frustrating.  Sorry to clog the group with something I figured out
myself, but maybe it will be useful to someone else.




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