[mochikit] Chained Deferreds

Mon, 22 May 2006 07:38:22 -0700 

Hi,

I am starting to get productive using MochiKit, but I cannot quite get
the grip of chained Deferreds.

I have a postJSONDoc function that I got from this group
(http://groups.google.com/group/mochikit/msg/dd23d8779dce92f3?dmode=source)
that looks like this:

postJSONDoc = function (url, postVars) {
        var req = getXMLHttpRequest();
        req.open("POST", url, true);
        req.setRequestHeader("Content-type",
"application/x-www-form-urlencoded");
        var data = queryString(postVars);
        var d = sendXMLHttpRequest(req, data);
        return d.addCallback(evalJSONRequest);
}

This function is called from my code whenever I need to perform a POST.

Now, my problem is that I need to examine the response before I return
it.
If the message equals a special error message from the server, I need
to take special actions before returning the response, so I thought
that chained Deferreds might be a solution.

However, all my attempts to do so have failed.
Does anyone have any suggestions?

Thanks,
Kristoffer

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To: "MochiKit" <[email protected]>
Subject: Chained Deferreds
Date: Mon, 22 May 2006 14:38:20 -0000
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Hi,

I am starting to get productive using MochiKit, but I cannot quite get
the grip of chained Deferreds.

I have a postJSONDoc function that I got from this group
(http://groups.google.com/group/mochikit/msg/dd23d8779dce92f3?dmode=source)
that looks like this:

postJSONDoc = function (url, postVars) {
        var req = getXMLHttpRequest();
        req.open("POST", url, true);
        req.setRequestHeader("Content-type",
"application/x-www-form-urlencoded");
        var data = queryString(postVars);
        var d = sendXMLHttpRequest(req, data);
        return d.addCallback(evalJSONRequest);
}

This function is called from my code whenever I need to perform a POST.

Now, my problem is that I need to examine the response before I return
it.
If the message equals a special error message from the server, I need
to take special actions before returning the response, so I thought
that chained Deferreds might be a solution.

However, all my attempts to do so have failed.
Does anyone have any suggestions?

Thanks,
Kristoffer


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