Run javascript that depends on multiple remote assets

Async JS is the way of the present (and future). We MUST load all of our scripts async. They are getting heavy and slow, and the browser needs help, specially on mobile devices. Why wouldn’t you want your page to load faster (see this post).

As web pages grow more and more complex, the idea of a single script that does everything is Jurassic. But what if we want to run code that depends on multiple scripts at the same time? If your app/site is complex you should look into requireJS. If you need something less daunting … I got you (with jQuery):

Neat right? … Let’s kick it up a notch. Say we need the script AND some external data file:

And now the cherry on top … we want to load myData.jsonĀ or yourData.json or just nothing conditionally:


I’m sure you can do something similar on vanilla JS … but if you need something like this, chances are you are running jQuery.

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