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It seems like I can get JSON data from a different domain using jQuery’s getJSON method (see: http://docs.jquery.com/Getjson). However, this works only for HTTP GET.
What if I needed to POST something and get the JSON response? How would I do that in jQuery/Ajax?
It is not possible to POST requests to a remote server from the client using jQuery alone as of version 1.6.1 in all browsers. If you attempt to make an XHttpRequest of any sort to a server in a different domain than the document, some browsers will simply fail to complete it. The JSONP requests to remote servers are handled by creating a script tag, the src for which is the API url with the query parameters added, including a callback method name. Because scripts can be loaded from any domain, this works, but it limits you to GET requests. The remote host returns the body of the script which is the callback invoked on the resulting javascript object. jQuery typically creates the callback function for you and from it calls the anonymous callback function you supply in the
getJSONmethod parameters.There are emerging standards, CORS and UMP (see also the comparison), that some browsers support but not in standardized ways (read IE does it differently). There are plugins to provide partial support for those browsers that do support CORS. No idea how well they work and they won’t work unless the browser supports it.