Disable the Cache Busting in Dynamically Linked External Javascript Files?

Question

When loading content through AJAX which contains an externally linked Javascript file or when using jQuery.getScript() function call, the linked Javascript files are appended with a cache busting parameter, which prevents the file from being cached by the browser.

So, instead of writing something like <script src="/js/foo.js">, it writes something like <script src="/js/foo.js?_=ts2477874287">, causing the script to be loaded fresh each time.

Is there a way to disable this and have the file cached when it's loaded?

Greg Pettit · Accepted Answer · 2011-10-04 19:56:15Z

3

I don't know about getScript, but cache is a parameter you can set in a .ajax() parameter map. It's false by default for scripts but you can flip it to true. Once false, it won't append a cache-busting query string.

[updated per comment]

edited Oct 4, 2011 at 19:56

answered Oct 4, 2011 at 17:58

Greg Pettit

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4 Comments

Highway of Life Over a year ago

I think you have the true/false in reverse. Default for cache is true, false for dataType 'script' and 'jsonp'. Thus flipping it to true, it should avoid the cache busting parameter? -- They don't seem to have a way to do this in getScript, and unfortunately it still doesn't help me figure out how to override generic <script> tags (i.e. not loaded through an ajax call), so the only thing I can currently think of is that I'd have to use jQuery.ajax with cache set to true for all dynamically loaded content with linked external JS files.

Greg Pettit Over a year ago

Yes, I had it straight in my head but wrote it down flipped. Thanks! I'm failing to understand what you mean about generic script tags, but that's probably on me.

Highway of Life Over a year ago

Naw, it's on me. I wasn't clear. Assume I'm using jquery.load('mypage.html'); The mypage.html contains HTML as well as a linked script: <script src="./js/foo.js"> yet even that gets the cache buster parameter.

Greg Pettit Over a year ago

Oh, now that's interesting. Alas I don't know anything about that.

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