9/5/2023 0 Comments Javascript is undefined![]() Here’s an example of the CDN fallback code: If it hasn’t been loaded then a local copy is accessed. I personally prefer a blended approach that attempts to load the CDN version of the library but then checks afterward to see if jQuery was loaded. There are many arguments on whether you should or should not rely on local versus hosted/CDN options for your libraries but they are outside the scope of what we are covering here. These services are great in providing improved page performance/load times and have a relatively high up time. To speed up page load times we can use a CDN (content delivery network) like Google to host and provide JavaScript sources. ![]() However, having to access a locally hosted copy of these files can lead to longer page load times for those not near the server location. If you host your jQuery library on your own servers and something happens that prevents the local copy from being loaded, jQuery will not be available. In this case, jQuery is being loaded but it’s coming after another library/script that attempts to use jQuery and expects it to be defined.īelow is an example of jQuery being loaded AFTER app.js which might contain references to jQuery which has not been loaded:Īnother potential issue is if jQuery is not found and thus not loaded. This is often the most simple (yet overlooked) causes of jQuery being undefined. #1 – Incorrect load order of JavaScript assets Knowing them can save you a tremendous amount of time (and a few headaches!) down the road. There are other potential causes for these errors but these four tend to be the most common. Incorrect load order of JavaScript assets.Here are the top causes/situations where you’ll likely run into the jQuery is undefined problem: The most common causes of the jQuery is undefined error vary from being simple load ordering issues to the more vicious framework implementation ‘gotchas’ that can take a long time to track down, (unless you know about them ahead of time.) To get started I’ll go over some of the most common causes of the error and then dive into them individually to explain why it happens and how to fix the problem (or at least give you a few different options). ![]() Learn more and try Raygun free for 14 days. Be alerted to issues affecting end users and replicate problems 1,000x faster than using logs and incomplete information from users. It takes minutes to add Raygun into your software. ![]()
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