How To Read The Streaming Data From IE Xmlhttprequest Object

Apr 3, 2006

I am going to use the server push

for streaming the data by keeping the connection open. At client side,
i am having the XMhttprequest object (i.e ActiveX object of IE). When
the data comes, onreadystatechange method get callback on state 3 but
it doesn't allow me to read the data from the object. It says 'The data

necessary to complete this operation is not yet available'. Is it
possible to read the streaming data from the XMLHttprequest object in
IE?

I know Mozilla supports to read the data, when the ready state is 3. In

Internet Explorer, how we can use the XMLhttp Active object to read the

streaming data.

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XMLHTTPRequest Streaming Data

Jul 23, 2005

I am playing with the XMLHTTPRequest method to perform client/server
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it takes the XML and processes it. This works great until there is alot
of data. In that case, the user will have to wait for the data to come
back which may take a minute or so.

I don't want the user to have to wait. Is it possible for javascript to
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has received thus far? I guess this would be considered a type of
streaming.

In mozilla/firefox, I have read that I can use readyState 3 to run my
callback function every 4096 bytes. I can then take those 4K, parse
them, and then continue on. However I have also read that IE cannot do
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[Code].....

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Xmlhttprequest Object

Apr 24, 2005

function XML_request(func) {

var onreadystatechange= func;
this.method = "GET";
this.get = function(url) {

var request = null;
var state_change = function() {
if (request.readyState==4) {
if (request.status==200) {
onreadystatechange(request);
} else {
return null;
}
}
}

try {
request = new XMLHttpRequest();
} catch(e) {
try {
request = new ActiveXObject("Microsoft.XMLHTTP");
} catch(e) {
return null;
}
}
if (request===null) {
return null;
}
request.onreadystatechange = state_change;
request.open(this.method, url, true);
request.send(null);
}
}
var req = new XML_request(function(response) {
response = response.responseXML
alert(response.getElementsByTagName('blah')[0].firstChild.data);
});

req.get('index.php?mode=blah&a=response')



i didn't like the examples I found so this is suitable.. I only tested in ie and firefox though.. so let me know what I may be missing.. or criticism in general.

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<html>

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Before we invoke the response handler, I'm putting the eval'ed responseText in the request object like so:

Code:
req.respText = eval('(' + req.responseText + ')');
This works in FF but breaks in IE 6. (*gasp*)

I finally got the Microsoft Script Editor yesterday, so I could play with the values and see what was going on. Kind of... I'm still in the dark. For some reason, it won't let me add a property to req. Can anyone explain why/how it prevents me from doing so?

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Quote:

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// For Mozilla, req = new XMLHttpRequest();
// For IE req = new ActiveXObject("Microsoft.XMLHTTP");
req.onreadystatechange = requestHandler ; // function to handle async
response
req.open('POST', myURL, true); // use POST
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A Perl CGI script prints the parameters passed to it.
$q = new CGI ;
foreach my $param ($q->param) {
print "$param: " . $q->param($param) . "
" ;
}

The data received by the CGI script is inconsistent, depending if the client
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Server result from IE client:
foo: 11
bar: 22
Server result from Mozilla Firefox client:
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It seems that the POST data IE sends is more correct than the Mozilla data.
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I need to mention that this is for a local application that sometimes
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I hear the Google suggest tool bar uses xmlHTTPrequest to look up a
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Jul 23, 2005

Ive been banging my head on the wall for hours with this one, hopefully
someone will know what Im doing wrong here :

The Goal:

I have an xml file that is generated on the fly via JSP which I want to
load into a Microsoft.XMLHTTP ActiveX object and manipulate via
javascript on the client side. Data is retreived from the server at the
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Ive tried to override the mime type within the javascript, using the
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req = new XMLHttpRequest();
req.overrideMimeType("text/xml");
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} else if (window.ActiveXObject) {
// branch for IE/Windows ActiveX version - NOT WORKING
req = new ActiveXObject("Microsoft.XMLHTTP");
if (req) {
req.onreadystatechange = processReqChange;
req.open("GET", "models.jsp?cId=300006&mId=TAC24", true);
req.setRequestHeader("Content-Type","text/xml");
req.send();
alert(req.responseXML.xml); //this gives me nothing
}
}

In looking at the following example the Microsoft gives (bottom of
page):

http://support.microsoft.com/defaul...B;EN-US;Q290591

I just dont see what could be going wrong here.


I should note that I successfully got the script to work using the
XMLHttpRequest object and the overrideMimeType() method. This works
with FireFox and I think some Mozilla clients, but not with the all
important IE5, which instead uses the XMLHTTP ActiveX control.=

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