Re: Having trouble using XMLHttpRequest to refresh data

Does it work in Safari?

On 23-May-05, at 9:37 AM, Blake Patterson wrote:

Yes, the function I am calling looks exactly like that, line for line save the comments.

Right at the top of the processReqChange() function, I output req.readyState (which I'd hope is 4) and it's always 0.  Again, I do have the proper plist boolean set to allow outside access.  I am losing my mind here.  

Thanks.

bp

On May 23, 2005, at 9:59 AM, Marc Tremblay wrote:

Does the code you're using to make the request look similar to this code?  Specifically, do you have both the req.open() and req.send() calls?

function refresh() {    

    req = new XMLHttpRequest();

    req.>

    req.open('GET', url, true);

    // this is the magic incantation to get subsequent XMLHttpRequest calls to work

    req.setRequestHeader('If-Modified-Since', 'Wed, 15 Nov 1995 00:00:00 GMT');

    req.send(null);

}

On 22-May-05, at 1:28 PM, Blake Patterson wrote:

Thaddeus & Marc,

Trying both of these makes no difference.  When I output req.readyState at the top of processReqChange(), it's always 0.

What else could it be?  I am pulling my hair out here!  Thanks.

bp

On May 22, 2005, at 12:10 AM, Marc Tremblay wrote:

Another approach is to set the If-Modified-Since HTTP header to some time in the past.

req.setRequestHeader('If-Modified-Since', 'Wed, 15 Nov 1995 00:00:00 GMT');

Marc

On 21-May-05, at 11:26 AM, Thaddeus Cooper wrote:

This is a caching bug that I ran into as well. If the URL is the same every time then you get the undefined error. I "fixed" the problem by adding ?ts_cache=<currenttime> to the URL to make it different and the problem went away.

Hope that helps.

--Thaddeus O. Cooper

(email@hidden)

On May 21, 2005, at 8:45 AM, Blake Patterson wrote:

I have two chunks of HTML on my widget that I want to refresh with a timer, pulled from remote .js files that just do document.writes of HTML.  Poor man's RSS sort of - but my needs go beyond RSS so that's not an option for me.

Anyway, I wrote this demo that basically works:

http://www.blakespot.com/xml.html

I am trying to do the same thing in my widget, but it never works.  Let me explain.

In my loaded() function, called as onLoad in my BODY tag, I do this:

loadXMLDoc('http://www.blakespot.com/doc1.html');

And that function I have defined as:

function loadXMLDoc(url) 

{

    if (window.XMLHttpRequest) {       

        req = new XMLHttpRequest();

        req.>

        req.open("GET", url, true);

        req.send(null);

    } 

}

...and this function calls:

function processReqChange() 

{

    // only if req shows "loaded"

    if (req.readyState == 4) {

        // only if "OK"

        if (req.status == 200) {

                    document.getElementById('news').innerHTML = "yo";

        } else {

            document.getElementById('news').innerHTML = "There was a problem retrieving the XML data:\n" + req.statusText;

        }

    }

}

And this is the block of code I am trying to replace (the element id = news)

    <span class="newsText">

        <br>

        <div id="news">start</div>

    </span>

...the problem is, req.readyState is always 0.  The state indicates UNDEFINED.  I do have:

    <key>AllowNetworkAccess</key>

    <true/>

In my plist.  What could be the issue?  I can hit the net fine from this machine.  I have been stumped for days here.  Any ideas?  The issue is not really whether it's updating the 'news' element id because, as I said, when I output req.readyState in the top of processReqChange, it's always 0...

req is defined as a global var at the start of the .js file for my widget.

Thanks for any help!

bp

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