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POhow to cache the javascript file
 

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  1. POhow to cache the javascript file
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    <p>Hello I am trying make a browser cache experiment. like this </p> <pre><code>&lt;head&gt; &lt;script type="text/javascript" src='&lt;%=Tool.GetFileRefUrl("js_cached.js")%&gt;' &gt;&lt;/script&gt; &lt;script type="text/javascript"&gt; var lastFile = fun(); &lt;/script&gt; &lt;script src="js_cached.js" type="text/javascript"&gt;&lt;/script&gt; &lt;script type="text/javascript"&gt; var cacheFile = fun(); &lt;/script&gt; &lt;/head&gt;&lt;body&gt; &lt;form&gt; &lt;div&gt; The cache file is :&lt;script type="text/javascript"&gt; document.writeln(cacheFile); &lt;/script&gt; &lt;br /&gt; The last file is :&lt;script type="text/javascript"&gt; document.writeln(lastFile); &lt;/script&gt; &lt;/div&gt; &lt;/form&gt; &lt;/body&gt; </code></pre> <p><code>Tool.GetFileRefUrl("js_cached.js")</code> will return a random js file string every time like <code>"js_cached.js?v=8752162122311"</code></p> <p>The first time the <code>fun()</code> runs it returns "A", so the page will show:</p> <blockquote> <p>The cache file is :A<br> The last file is :A</p> </blockquote> <p>Now I changed the file <code>js_cached.js</code> which on the web server and make <code>fun()</code> return "B" and I hope too see the result:</p> <blockquote> <p>The cache file is :A<br> The last file is :B</p> </blockquote> <p>but it actually is:</p> <blockquote> <p>The cache file is :B<br> The last file is :B</p> </blockquote> <p>Is something wrong? Why does the browser not cache the js file? Did I make an incorrect assumption?</p> <p>the fun is</p> <pre><code> function fun() { return "A";//after modify it be "B" } </code></pre> <p>the Tool.GetFileRefUrl is</p> <pre><code>public class Tool { public static string GetFileRefUrl(string url) { var ticks = GetLastWriteTime(url); var result = string.Format("{0}?v={1}", url, ticks); return result; } private static long GetLastWriteTime(string fileName) { var lastWriteTime = File.GetLastWriteTime(HttpContext.Current.Server.MapPath(fileName)); return lastWriteTime.Ticks; } } </code></pre>
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    1. USMarsen Lin
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      1. VTUpMod
    1. COyou need to include the fun-function in your question because thats where your problem is...
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      1. POhow to cache the javascript file
      1. UShereandnow78
    2. COHow does your server handle the `v` parameter? Please post the whole server responses, including cache headers and content. Also, how did you reload the page?
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      1. POhow to cache the javascript file
      1. USBergi
    3. COI add the fun() and Tool.GetFileRefUrl("js_cached.js") in my question. And I reload the page by use press F5 or copy the url to open new browser tab. tks for reply
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      1. POhow to cache the javascript file
      1. USMarsen Lin
 

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