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It appears that a recent commit may have broke the stop() function?
Basic test: http://jsfiddle.net/n8felton/MJZJa/
Hm, there has never been such a method in the official spin.js plugin, only in the Spinner object. To stop a spinner via jQuery you have to call $('#el').spin(false).
On your primary site, it states:
Hiding the spinner
To hide the spinner, invoke the stop() method, which removes the UI elements from the DOM and stops the animation. Stopped spinners may be reused by calling spin() again.
This may just be a regular function, not necessarily a jQuery function. Regardless, it was working with test code yesterday, and now the stop() function appears to not work anymore. I will use the method you described however, as that appears to work.
Strange, maybe you were using a 3rd party plugin? The official one only exists since yesterday and hasn't changed since the first commit: https://github.com/fgnass/spin.js/commits/gh-pages/jquery.spin.js
BTW, you can invoke the underlying stop() method like this: