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  • Status: Solved
  • Priority: Medium
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Refresh image on web browser

Hi Experts,

I generated jfree chart image on web browser and it displays different chart in FireFox when I hit different link, but not in IE9.
Since it is working FF, I am thinking it has something to do caching issue in IE.

This is the source from the popup windows that displays the chart.
I added these in head tag, but didn't help.

<meta Http-Equiv="Cache-Control" Content="no-cache">
<meta Http-Equiv="Pragma" Content="no-cache">
<meta Http-Equiv="Expires" Content="0">
<meta Http-Equiv="Pragma-directive: no-cache">
<meta Http-Equiv="Cache-directive: no-cache">



<map id="imageMap" name="imageMap">
</map>





<html>
<head>
<meta Http-Equiv="Cache-Control" Content="no-cache">
<meta Http-Equiv="Pragma" Content="no-cache">
<meta Http-Equiv="Expires" Content="0">
<meta Http-Equiv="Pragma-directive: no-cache">
<meta Http-Equiv="Cache-directive: no-cache">

<title></title>
</head>




<body>


	

	<img src="http://localhost:8080/xxxx/servlet/ChartViewer" border=0 usemap="#imageMap">

</body>
</html>

Open in new window


Any idea?
0
dkim18
Asked:
dkim18
  • 2
2 Solutions
 
Dave BaldwinFixer of ProblemsCommented:
The problem you're running into is that your code only affects the caching of the main HTML page... and not the cache of the image.  Those are two separate items.  If you change the image name by even one letter in both the file name and the HTML page, you will see the new image.  This is a problem we constantly run into.  CSS and javascript files have this problem also.  Sometimes you have to directly open image, CSS, and javascript files to get the current version.  A first time visitor does not have this problem because they don't have any of the files in their browser cache.
0
 
dkim18Author Commented:
you mean changing "ChartViewer"?
0
 
GaryCommented:
One thing you can do is append the src url with a large random number or timestamp each time you generate the page that way the browser will always request a new image e.g.

http://localhost:8080/xxxx/servlet/ChartViewer?randomnumber=1245234
0
 
Dave BaldwinFixer of ProblemsCommented:
Gary's right, if that's a 'generated page' then that's easy to do.  A common method appends a current timestamp to the URL.
0

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