Is there a problem with evalJSON() causing Simple AJAX JS to work on Safari locally but fail on the server and in Firefox?

I created a script that utilized Prototype's AJAX methods to fetch Twitter data in JSON format, process it, and display it within a div. The script was functioning perfectly during testing on Safari 4.0.3 on an OS 10.6.1 machine. However, when I uploaded the script to a server, it stopped working. Despite having all client-side components and referencing the same Prototype.js file, I couldn't identify why it was functional locally but not remotely.

To troubleshoot, I simplified the script to its core functionality - displaying the latest tweet from my timeline in an alert box. The issue persisted, both on the server and in Firefox. I acknowledge that there might be a fundamental error in my approach, but I'm unable to pinpoint it.

Below is the complete code snippet of my page. It functions locally but experiences issues on the server and in Firefox:

<!DOCTYPE html>
<head>
    <meta http-equiv="Content-Type" content="text/html; charset=utf-8">
    <title>Test</title>
    <script type="text/javascript" src="http://ajax.googleapis.com/ajax/libs/prototype/1.6.0.2/prototype.js"></script>


    <script type="text/javascript" charset="utf-8">
    document.observe("dom:loaded", function(){
        var tweetAddress = "http://twitter.com/status/user_timeline/hellbox.json?count=1";
        new Ajax.Request( tweetAddress, { 
            method: 'get',
            onSuccess: function (transport) {
                var tweets = transport.responseText.evalJSON();
                alert(tweets[0].text);
            }
        });
    });
    </script> 
</head>
<body> 
</body>
</html>

Answer №1

Encountering the obstacle known as the "same origin policy" barrier. It is not possible to make an AJAX request to twitter.com from a website that is hosted on a different domain.

Suggesting the use of JSONP instead of JSON:

JSONP involves injecting a <script> tag into your webpage, triggering the execution of a designated callback function by the loaded script. This method is not restricted by domain limitations when fetching scripts from external sources.

Answer №2

It appears that your intention is to make an Ajax request to the domain twitter.com.

However, if your application is not hosted on the twitter.com domain, you will not be able to successfully make Ajax requests to it. Ajax requests can only be made to the domain where your application is hosted.

For example, if your website is located at "www.mydomain.com", you can only send Ajax requests to "www.mydomain.com". Requests to other domains like "test.mydomain.com" or "www.anotherdomain.com" will not be allowed.

This restriction is enforced by web browsers through the Same Origin Policy, which limits the ability of scripts from one site to access resources from another site.

One potential solution to this issue is to set up a proxy on your own domain that can forward requests to twitter.com. This way, your website can send queries to your domain, which will then be forwarded to twitter without running into Same Origin Policy restrictions.


Regarding your mention of it working locally, if you were running a web server on your local machine and accessing the site from there, it should not have worked due to the Same Origin Policy.

If you were opening the file locally using something like file://.../myfile.html in the browser's address bar, it's possible that Safari doesn't enforce the Same Origin Policy for local documents, but this is not confirmed.

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