There are a problems requesting JSON object from GDATA using jQuery.
jQuery appends a timestamp to the url which causes GData to throw an
"Invalid parameter" error. If you check with FireBug, you'll see it.
Also, GData's API says to use "alt=json-in-script" instead of just
"alt=json". It's hard to find, and I made the same mistake at first.
Without a callback parameter in the query, GData will return the
object wrapped in "gdata.io.handleScriptLoaded({...})" but jQuery
seems to want to try callback-less JSON requests as XHRs.
I ended up working around these problems by manually inserting the
script and building a dummy gdata.id object to catch the result. It's
clumsy but it works and will be easy to convert once jQuery and GData
start to get along better.
gdataURL =
http://gdata.youtube.com/feeds/api/videos?format=1&vq=cat&start-index=10&max-results=20&orderby=viewCount&alt=json-in-script
// insert the script:
var s = document.createElement('script');
s.src = gdataURL;
document.getElementsByTagName('head')[0].appendChild(s);
//fake object:
gdata = { io: { handleScriptLoaded: function(data)
{ JSONparser(data); } } };
I've posted to this list about this and opened an issue with Google:
http://code.google.com/p/gdata-issues/issues/detail?id=390
Hope this helps,
joe
On Mar 7, 3:36 am, Saidur <[EMAIL PROTECTED]> wrote:
> Hi ,
> I want to get the json data from the youtube api (http://
> code.google.com/apis/youtube/developers_guide_protocol.html).
>
> My code is like :
> url="http://gdata.youtube.com/feeds/api/videos?format=1&vq=cat&start-
> index=10&max-results=20&orderby=viewCount&alt=json";
>
> $.getJSON(url,callBackFucntion);
>
> function callBackFucntion ()
> {
> // here parse the json data
>
> }
>
> But i got an error when i run this code.
> [Exception... "'Permission denied to call method XMLHttpRequest.open'
> when calling method: [nsIDOMEventListener::handleEvent]" nsresult:
> "0x8057001e (NS_ERROR_XPC_JS_THREW_STRING)" location: "<unknown>"
> data: no]
>
> so agian i change the url and add the callback parameter with ? :
> url="http://gdata.youtube.com/feeds/api/videos?format=1&vq=cat&start-
> index=10&max-results=20&orderby=viewCount&alt=json&callback=?";
> $.getJSON(url,fucntion (data){ // parse json data
> alert ('json data get');
>
> });
>
> This time i do not get error . But i do not get the call back
>
> So how can i get the json data problem
>
> Thanks
> Saidur Rahman
