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I want to extend the ajax function so that whenever it is called an image appears on the page that indicates there is content loading.
I can use prefilters as discussed on this page http://api.jquery.com/extending-ajax/ to show the image but how could I hide the image once the request is complete?
Please have a look here: Global Ajax Event Handlers
These make it trivial to implement a loading image whenever an ajax request is sent through jQuery. No extending needed.