Thanks for your hints, I now found the solution.
The browser cached the file, so I attached a random number at the end of the
src tag:
<img src="/cake/mycontroller/graph/".<?php echo rand(); ?>" />
I also put a <div id="myimage"> tag around the img tag and update the div in
the ajax call, not the image itself. In the Ajax call it is important to
call a new page, where you have just the <img> tag in:
$options = array('url' => 'page_with_only_img_tag, 'update' => 'myimage');
echo $ajax->observeField('selecttag',$options);
If you try to update directly the implemented <img>, it does not work.
Make shure to put the layout of this page to ajax by adding the line
$this->layout='ajax'; in the controller.
Greets Tom
> -----Original Message-----
> From: [email protected] [mailto:[EMAIL PROTECTED] On
> Behalf Of [EMAIL PROTECTED]
> Sent: Saturday, January 12, 2008 10:31 PM
> To: Cake PHP
> Subject: Re: Ajax update of JpGraph in CakePHP
>
>
> I think this is a browser issue, I've found that, if you change an
> image that has already been downloaded, the browser will use the
> cached image instead of re-downloading the updated image from the
> server. What I've done to get around this is to create a temporary
> image with a random name, then the browser doesn't have a cached image
> and is forced to download it. I'm not all that familiar with JpGraphs
> but I bet if you save the resulting graph as an image with a random
> name, it will fix your problems.
>
> Dave
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