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Editorial Team
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Asked: 2026-05-23T15:18:17+00:00

In my custom JS code file I use various plugins, for instance, the Masonry

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In my custom JS code file I use various plugins, for instance, the Masonry plugin for JQuery. However, I don’t include the plugin on every page or at the master page file level (in some yes, in some no) but I do include my custom file on every page. Therefore, the code in my JS file will issue an error if the Masonry plugin is missing.

If someone could reply with a solution of how to:

  1. Check if certain JS plugin was referenced (included) and only run the code then,
  2. (optionally) include the file at runtime if it is missing.

I have it working with JQuery and JQuery UI because they both introduce a class into DOM structu (jquery and jquery.ui objects) but there are other plugin’s like lightbox scripts, the forementioned Masonry etc..

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1 Answer

  1. Editorial Team

    Rather than checking whether a particular JavaScript file has been ‘included’, I’d just check if the functionality that you need is available (i.e. if you need a function named foo, just do something along the lines of typeof foo == 'undefined' to see if it is there …).

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