For information about the arguments this function receives, see the jqXHR Object section of the $.ajax() documentation.
The jqXHR.done() (for success), jqXHR.fail() (for error), and jqXHR.always() (for completion, whether success or error added in jQuery 1.6) methods take a function argument that is called when the request terminates. This jQuery XHR object, or "jqXHR," returned by $.getJSON() implements the Promise interface, giving it all the properties, methods, and behavior of a Promise (see Deferred object for more information).
The jqXHR ObjectĪs of jQuery 1.5, all of jQuery's Ajax methods return a superset of the XMLHTTPRequest object. See the discussion of the jsonp data type in $.ajax() for more details. If the URL includes the string "callback=?" (or similar, as defined by the server-side API), the request is treated as JSONP instead. For example, all strings represented in JSON, whether they are properties or values, must be enclosed in double-quotes. JSON is a data-interchange format with syntax rules that are stricter than those of JavaScript's object literal notation. Avoid frequent hand-editing of JSON data for this reason. Important: As of jQuery 1.4, if the JSON file contains a syntax error, the request will usually fail silently.
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