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Quick Tip: How to Load jQuery Conditionally


Many developers like to link to an externally hosted jQuery library, like for example Google’s jQuery library (http://ajax.googleapis.com/ajax/libs/jquery/1.4.2/jquery.min.js), but the problem with linking to an external jQuery library is that they can be a bit unreliable. If for some reason there are any issues with the server, the script may not be able to be accessed and your jQuery code won’t work.

HTML5’s boilerplate¬†uses a really cool conditional statement that will load a local jQuery library on the occasion that, for whatever reason, your external library isn’t loading or working correctly. Check it out:

<!-- Grab Google CDN jQuery. fall back to local if necessary -->
<script src="//ajax.googleapis.com/ajax/libs/jquery/1.4.2/jquery.min.js"></script>
<script>
   window.jQuery && document.write('<script src="js/jquery-1.4.2.min.js"><\/script>')
</script>

Of course, you’ll need to insert your own path to wherever your local jQuery files are located (instead of ‘<script src=”js/jquery-1.4.2.min.js”></script>’), but this is a very simple way to make sure that your jQuery library always loads.

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