How to Web Development

How to use a local fallback in the event a CDN isn’t available for jQuery

Worried about using a CDN?

  • Worried about a CDN being down?
  • Concerned a CDN might slow your site down?
  • Thinking there must be a down side to accessing files from a CDN?

Fear not a CDN (Content Delivery Network) is a globally distributed network of servers deployed in many data centers. Giving you several advantages:

  • A CDN is unlikely to be down, after all, up time is one of the big selling points of CDN.
  • Decreased latency so that a user accessing your site will be able to download the content faster
  • Increased parallel connections can be made. Again increasing the speed your content and site can download to a users browser
  • Cross-site caching if other sites your users have visited also use the same CDN. jQuery may already be cached in their browser

If that hasn’t allayed your fears? Then you can always use a fallback for a local version of jQuery like this:

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