Using image.complete to find if image is cached on chrome?

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I’ve rewritten your code in plain JavaScript, to make it more independent on jQuery. The core functionality hasn’t changed.
Fiddle: http://jsfiddle.net/EmjQG/2/

function cached(url){
    var test = document.createElement("img");
    test.src = url;
    return test.complete || test.width+test.height > 0;
}
var base_url = "http://www.google.com/images/srpr/nav_logo80.png"
alert("Expected: true or false\n" +
      cached(base_url)
      + "\n\nExpected: false (cache-busting enabled)\n" +
      cached(base_url + "?" + new Date().getTime()));
//false = not cached, true = cached

The first time, I get false and false. After I run the code again, I get true and false.

Using .complete and .height + .width gives the expected results (FF 3.6.23, Chromium 14).

It’s very likely that you’ve disabled the caching at your Chrome browser. If not, check the HTTP headers of your served image (Is Cache-control present?). This header exist at the Google sample

If you want to detect when an image has (not) finished loading, have a look at this question.

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