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Kelvin Zhao
10,418 PointsWhen to know to use ?jsoncallback=?
When do we know to add the ?jsoncallback=? to the end of the url?
Also doesn't the 'format' already request a json format, why do we need to add that?
If we don't use that, what happens, what other way do we script the request (I'm assuming that means the get back isn't in the json format?)
Thanks in advance!
1 Answer
Dave McFarland
Treehouse TeacherHi Kelvin Zhao ,
You use the ?jsoncallback=? when using jQuery's getJSON() method. That tells jQuery that it needs to make a JSONP request, not a normal AJAX request. JSONP isn't exactly AJAX -- it actually creates a new script tag that embeds JavaScript from Flickr. If you remove the ?jsoncallback=? from the URL, then you will get an error because the page is then making a cross-domain AJAX request which is forbidden by the browser's "Same-origin" policy.
The part where you set the format to json is just the information you send to Flickr -- it tells flickr that you want JSON data in return. Setting the format to json has no affect on how the request is made.
nitin suresh
5,691 Pointsnitin suresh
5,691 PointsHello @davemcfarland I love the course !. How can we do cross-domain request now with CORS?