automatic image reload?

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  • JR
    #1

    automatic image reload?

    Is there a script available to automatically reload images on visiting
    a page? I change images once a week and they have the same name so
    I'm not changing the page code. Some people have the previous week's
    image in their cache. I'd rather not put a message line on the page
    asking the visitor to hit the refresh button nor use a code that
    reloads the whole page unless reloding the page is an only option.

    Thanks for your suggestions,

    John
    Tags: image reload, img reload
    • Lee
      #2
      Re: automatic image reload?

      JR said:[color=blue]
      >
      >Is there a script available to automatically reload images on visiting
      >a page? I change images once a week and they have the same name so
      >I'm not changing the page code. Some people have the previous week's
      >image in their cache. I'd rather not put a message line on the page
      >asking the visitor to hit the refresh button nor use a code that
      >reloads the whole page unless reloding the page is an only option.[/color]

      Append a unique "search" suffix to the src of each image.
      You could do this as the page loads, but it's simpler to
      do it after the load, as in this example:


      <html>
      <head>
      <script type="text/javascript">
      function refreshImages() {
      var search="?"+(new Date()).getTime ();
      for(var i=0;i<document. images.length;d ocument.images[i++].src+=search);
      }
      </script>
      </head>
      <body onload="refresh Images()">
      <img src="http://www.azphx.com/dhtml/tmp/alpha6464.jpg">
      <img src="http://www.azphx.com/dhtml/tmp/beta6464.jpg">
      </body>
      </html>

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        • Thomas 'PointedEars' Lahn
          #3
          Re: automatic image reload?

          JR wrote:
          [color=blue]
          > Is there a script available to automatically reload images on visiting
          > a page? I change images once a week and they have the same name so
          > I'm not changing the page code.[/color]

          Client-side JavaScript will not help you in general here: It can be
          restricted, disabled or not even supported. You can define that
          standards-compliant UAs should always re-download the document and its
          linked resources from the original source (that should also exclude the
          cache of proxy servers, you did not think about that):

          <head>
          ...
          <meta http-equiv="expires" content="0">
          ...
          </head>

          On the Web (using HTTP,) you can use the `Expires' HTTP header the same way.
          See RFC 2616 for details.

          Another way are cookies that store the date of last visit and if that was
          more than a week ago, you force to reload with `location.reloa d(true)'. But
          their storage may be seen as a violation of privacy.


          PointedEars

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