Check existence of .js file RSS

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  My2ndLovE

  Member

  57 Points

  99 Posts

  Check existence of .js file

  May 03, 2012 01:37 AM|LINK

  Hi,

  In my application, i hosted all my js file into google.

  However, i would like to check the existence of the js file, if the js that located in google doesn't exist, then i will use the local js file.

  How to write a function to check above condition?

  Google js file

  <script type="text/javascript" src="http://wormsearch.googlecode.com/files/ws-master-v1.min.js"></script>

  Local js file

  <script type="text/javascript" src="~/js/min/ws-master-v1.min.js"></script>

  
  
  

  • Edited by My2ndLovE on May 03, 2012 01:37 AM
  • Edited by My2ndLovE on May 03, 2012 01:37 AM
  • Edited by My2ndLovE on May 03, 2012 01:38 AM
  • Edited by My2ndLovE on May 03, 2012 01:38 AM
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  robwscott

  Star

  8079 Points

  1491 Posts

  Re: Check existence of .js file

  May 03, 2012 03:27 AM|LINK

  <script src="http://wormsearch.googlecode.com/files/ws-master-v1.min.js"></script>
  <script>!window.jQuery && document.write('<script src="js/min/ws-master-v1.min.js"><\/script>')</script>

  also you cannot use "~" - this is a server feature. please review ResolveURL

  <script src="<%= ResolveUrl("~/js/min/ws-master-v1.min.js") %>" type="text/javascript" ></script>

  Please post your code for us to help!!
  Mark Answered if it helps - Good luck!
  Cheers!
  Design And Align
  - Rob
  
  • Marked as answer by Yanping Wang - MSFT on May 10, 2012 05:34 AM
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  AidyF

  Star

  9204 Points

  1570 Posts

  Re: Check existence of .js file

  May 03, 2012 10:49 AM|LINK

  For what it's worth I don't think this is a very good idea as it isn't efficient.  You also might not need the "resolveurl" bit, just use "/js/...".  But anyway.

  ASPX

  <script type="text/javascript" src="<%=Url %>"></script>

  Code

          public string Url { get; private set; }
  
          protected void Page_Load(object sender, EventArgs e)
          {
              Url = "http://wormsearch.googlecode.com/files/ws-master-v1.min.js";
              WebRequest req = WebRequest.Create(Url);
              try
              {
                  HttpWebResponse resp = (HttpWebResponse) req.GetResponse();
                  if (resp.StatusCode != HttpStatusCode.OK)
                  {
                      Url = ResolveUrl("~/js/min/ws-master-v1.min.js");
                  }
                  resp.Close();
              }
              catch
              {
                  Url = ResolveUrl("~/js/min/ws-master-v1.min.js");
              }
          }
  

  
  
  
  

  • Edited by AidyF on May 03, 2012 11:06 AM
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  friendster

  Member

  749 Points

  189 Posts

  Re: Check existence of .js file

  May 03, 2012 11:16 AM|LINK

  You can check with the Web http respose by reading the file. if the status is not "OK" . you can apply the next thing,

  According to my calculations the problem doesn't exist.