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How can JS/CSS cache busting be implemented for SharePoint Online in a master page? Other methods detailed on StackExchange do not work as SPO developers do not have access to the _layouts folder to store their custom JS/CSS files. I currently store my custom JS/CSS files in a read-only document library that everyone has access to. Some have posted about using a CDN, but there must be something easier.

Of course this can be manually accomplished by appending a "?v=[randomstring]" to your script filename but that isn't a best practice.

Ideally, I would like to utilize the OOTB cache management that SPO uses for its scripts where it adds a version number parameter.

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That OOTB cache management is done Server-side..

and with SPO.. Microsoft owns and maintains the Server

So you have to fix it Client-Side, like UserCustomActions (because they execute way before your Masterpage scripts) loading your files dynamically

first Google hit: http://www.javascriptkit.com/javatutors/loadjavascriptcss.shtml

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  • So really it sounds like I should avoid the masterpage completely for loading scripts, use the method from the link you provided, and append a random string to my scripts to always bust the cache. Do you agree?
    – Jiffy
    Commented Mar 8, 2017 at 18:48
  • Not messing with the MasterPage has been preferred practice since UserCustomActions were released in SP2010. This is from my own learnings a year ago: sharepoint.stackexchange.com/questions/178337/…
    – Danny '365CSI' Engelman
    Commented Mar 8, 2017 at 18:54
  • This Chrome Extension helps with UserCustomActions: chrome.google.com/webstore/detail/sp-editor/…
    – Danny '365CSI' Engelman
    Commented Mar 8, 2017 at 18:56
  • Good extension - thanks. It may be better to use a custom client side solution (as you suggested earlier) in this case to bust the cache. I tried adding some JS code directly in the extension - and it works - but it breaks the removal of that specific scriptlink.
    – Jiffy
    Commented Mar 8, 2017 at 20:27
  • I think the extension can only set the ScriptLink (to any https location you want), you need other code to set ScriptSrc
    – Danny '365CSI' Engelman
    Commented Mar 8, 2017 at 20:35

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