I want to develop a little os x widget which fetches data from an

Question

0

Asked: May 18, 20262026-05-18T00:22:34+00:00 2026-05-18T00:22:34+00:00

I want to develop a little os x widget which fetches data from an

0

I want to develop a little os x widget which fetches data from an xml source and then displays the results.
My problem is I never used javascript XMLHttpRequest before and I’m not sure what I’m doing wrong.

To start my project I want to create a simple script which returns the response header and alert it.
I’ve tried lot’s of different things I found on the web and I know it can’t be that difficult.

But whatever I try I get a ‘null‘ response. I even tried to get the content directly but with no luck.

I once heared that cross domain requests don’t work but I’m not sure if this info is up to date. And if it’s up to date then how can I make a request to a server using javascript when the javascript runs local, on my Mac in a widget ??

Here’s my code, maybe someone can show me what I’m doing wrong.

<html>
<title>This is a test</title>
<body>
This is a simple test.
    <p class="example"><a href="#" onclick="init();return false;">Try this.</a></p>
    <script type="text/javascript">
    function init()
    {   
        xmlhttprequest = new XMLHttpRequest();
        xmlhttprequest.onreadystatechange = function() {
        if (xmlhttprequest.readyState == 4) {
            alert(xmlhttprequest.getAllResponseHeaders());
            }
        }               
    var url = "http://stinfwww.informatik.uni-leipzig.de" ;
    xmlhttprequest.open("GET", url, true);
    xmlhttprequest.send(null);
    }
    </script>
</body>
</html>

If anyone got any suggestion I would really appreciate this. Or if you have any good resources (esp. on Javascript Widget Development) on this topic please let me know.

Thanks indeed