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JavaScript: How to check if a file is cached?

My site downloads a rather large js file the first time a user visits it, and I want to write something like "Downloading .. for the first time", this file is not from the cache.

Is this possible in javascript?

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in js

var loadedMyJS = true

in your html

  <script > function loadingIndicator(){ document.getElementById('loadingDiv').style.display=''; //to hideit will be 'none' } if(typeof(loadedMyJS) == 'undefined'){ loadingIndicator(); } </script >
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How about including a dynamic timestamp at the end and checking it after?

 var t=<?php echo time(); ?>;

At least I would have been instructed after this fact. Or would I mess up other caching mechanisms by updating the file?

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