On Aug 15, 2007, at 9:02 PM, Jacob Mouka wrote:
I vaguely remember running into this. I can't test it (no IE access
at the moment) but my old component has a name bound to the
WOImage's key attribute. I used a random number (eg 123.png) so
that the cache would be refreshed when the image gets updated.
Chuck's suggestion might work too, but if it doesn't, give this a
try. If I understand it correctly, if you don't bind the key
attribute then the image has to be re-fetched each time the page
loads, and I guess IE goes back to the source instead of looking in
its cache for printing.
A caution on this. See the docs for WOResourceManager.setData:
By default when a dynamic element requests an image from the
database, or builds a graph on the fly, it tells the resource
manager to store its data in a cache, using either a developer-
specified key, or a random key. In return the dynamic element
inserts a special url in the HTML so that the browser, on callback,
can retrieve the data out of the resource manager cache and display
it. If the key was specified by the component, the data stays in
the cache as long as the cache is not flushed. If the key was
randomly generated by the resource manager, the data is removed
from the cache (using removeDataForKey), as soon as the browser
retrieves it.
I read this as meaning that if you specify a key, you are responsible
for removing it from the cache (which I suspect is not easy to do at
the right time). If you don't do this you run the risk of running
out of memory.
Chuck
On 14-Aug-07, at 11:39 AM, Chuck Hill wrote:
On Aug 14, 2007, at 7:35 AM, Frederic JECKER wrote:
Hi list,
I'm using a WOImage to print charts generated by JFreeChart.
This works fine and the generated charts are displayed on the
browsers.
Now when I try to print my page with IE (this works well) the
generated pictures are not printed.
I googled for a while without success, I just found some posts
mentionning cache/content-type issues :
if they are not set correctly IE performs a refresh of the
picture before printing (which is the cause of my problem)
I checked my page for a pragma no-cache in the header and set a
correct mime time in the WOImage bindings without success.
Anyone could help me with this issue ?
Here is one way. This goes in Application.java
// Revert to 4.5 behaviour. Having this enabled prevents
IE from displaying content that cannot
// be displayed inline in the browswer (pdf files, for
example). This was a known bug in IE 4.0
// and is reported fixed by MS: http://
support.microsoft.com/support/kb/articles/Q231/2/96.ASP?LN=EN-
US&SD=gn&FR=0&qry=Internet%20Explorer%20cannot%
20download&rnk=19&src=DHCS_MSPSS_gn_SRCH&SPR=IE
// "When you try to download a .pdf file from a Web site
that uses the Hypertext Transfer Protocol
// (HTTP) "Cache-Control = 'no-cache'" directive, Internet
Explorer may generate the following
// error message: Internet Explorer cannot down load from
the Internet site File_name from
// Computer_name.".
setPageRefreshOnBacktrackEnabled(false);
Chuck
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