jquery: display loader until image exists in a specific folder

I want to display an image loader & keep checking until the image exists in a specific folder.

The images requested are dynamically generated through a queue so I have no idea when the

image will be actually there, but I h开发者_如何学Goave its name in hand.

This process involve two steps

1st: POST request to submit image to queue script. 2nd: display loader until image is actually there, then displaying the image itself.

Your help is greatly appreciated.

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you can use jquery image load , it waits until browser loads the image//

but it keeps waiting until the image is ready

http://api.jquery.com/load-event/