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POHowto: Javascript files always up-to-date
 

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  1. POHowto: Javascript files always up-to-date
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    <p>I have a .NET web applications which uses a lot of javascript. The .aspx and the .js files go hand-in-hand together. Problem: The .aspx files are always up-to-date on the client (not cached) but the .js files might well be cached. This is even a problem if the files are only cached for one session since users are spending many hours on my site and everytime I update a .aspx/.js pair users are running into a problem. </p> <p>Now, I found a solution but I am not sure if there is perhaps a better solution or if my solution has a performance drawback. </p> <p>This is my solution: </p> <p>.js-References in .aspx: </p> <pre><code>&lt;script type='text/javascript' src='../scripts/&lt;%# GetScriptLastModified("MyScript.js") %&gt;'&gt;&lt;/script&gt; </code></pre> <p>So, the "GetScriptLastModified" will append a ?v= parameter like this:</p> <pre><code>protected string GetScriptLastModified(string FileName) { string File4Info = System.Threading.Thread.GetDomain().BaseDirectory + @"scripts\" + FileName; System.IO.FileInfo fileInfo = new System.IO.FileInfo(File4Info); return FileName + "?v=" + fileInfo.LastWriteTime.GetHashCode().ToString(); } </code></pre> <p>So, the rendered .js-Link would look like this to the client:</p> <pre><code>&lt;script type='text/javascript' src='/scripts/GamesCharts.js?v=1377815076'&gt;&lt;/script&gt; </code></pre> <p>The link will change every time, when I upload a new version and I can be sure that the user immediately gets a new script or image when I change it. </p>
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    1. COIf I remember correctly, Safari will not cache anything downloaded with a query parameter. So your solution will be correctly cached by all other web browsers except Safari.
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    2. COIt's a common solution, but you're better off having the version in the filename, for instance /scripts/GamesCharts_<version>.js as query parameters prevent proxy caching of resources.
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      1. USDanny Thomas
    3. COYes, that's the solution I have today: Renaming the files to myscript_v1.js. But then I also need to update all references to those files. Then the history in my source repository is broken. It works as expected but I am looking for an easier solution...
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