jQuery cannot retrieve data from localhost

I have a very simple b开发者_开发问答it of jQuery to retrieve my latest Tweet

$.getJSON("http://twitter.com/statuses/user_timeline/username.json?count=1", 
           function(data) {
              $("#tweet_text").html(data[0].text);
           });

This works fine on a simple HTML file on my desktop. However, once the file is accessed from my localhost (apache) no data is being returned. I was wondering if any part of Apache was blocking the request somehow? Or any other ideas?

JavaScript cannot currently make direct requests cross-domain due to the Same-origin Policy.

You're best bet is probably to look into JSONP for this.

You can find more information on it from both jQuery:

If the URL includes the string "callback=?" in the URL, the request is treated as JSONP instead. See the discussion of the jsonp data type in $.ajax() for more details.

and Twitter:

Parameters:

• callback: Optional. Only available for JSON format. If supplied, the response will use the JSONP format with a callback of the given name.

  • Example: http://search.twitter.com/search.json?callback=foo&q=twitter

Hope this helps.

Correction...

If status/user_timeline supports JSONP, it's not documented as such.

You may have to look into setting up a Cross-Domain Proxy to get the data you want.

Try appending callback=? to the URL. Like this

"http://twitter.com/statuses/user_timeline/username.json?count=1&callback=?"

maybe it takes a bit longer for the html to load on localhost for some reason and you haven't wrapped the script in a dom ready. so it makes a call and there is no #tweet_text at that moment to get filled

This is a shorthand Ajax function, which is equivalent to:

$.ajax({
  url: url,
  dataType: 'json',
  data: data,
  success: success
});

Ajax (Non-JSONP) is not allowed to cross domains.