Posted by travers <tr...@gmail.com>.
Makes sense. I was hoping to do dashboard type implementation with
Jfreecharts where the ajax call to get the new chart based on a timer thats
why I did not want to persist the chart somewhere.
Frank W. Zammetti wrote:
>
> In general with AJAX this isn't possible... there's no way at present to
> insert binary data, be it an image, PDF, whatever, into the page, and have
> the browser render it.
>
> What you would have to do is return HTML instead, which includes an
> tag pointing to the image on the server, which in this case would be your
> chart, written out somewhere with some ID. For instance, you might write
> it to a database, using some unique identifier for the user as a key, and
> then your tag points to an Action, with the ID as a query string,
> that retrieves the image from the database based on the ID.
>
> So it would go something like:
>
> User clicks generate chart button --> Server generates chart, writes to DB
> ---> Return HTML like getChart.action?id=1234 --> HTML
> inserted into page, browser requests getChart.action to get image, which
> is an Action, not an image --> Action retrieves image from DB and returns
> it --> Chart displayed
>
> Frank
>
> --
> Frank W. Zammetti
> Founder and Chief Software Architect
> Omnytex Technologies
> http://www.omnytex.com
> AIM/Yahoo: fzammetti
> MSN: fzammetti@hotmail.com
> Author of "Practical Ajax Projects With Java Technology"
> (2006, Apress, ISBN 1-59059-695-1)
> and "JavaScript, DOM Scripting and Ajax Projects"
> (2007, Apress, ISBN 1-59059-816-4)
> Java Web Parts - http://javawebparts.sourceforge.net
> Supplying the wheel, so you don't have to reinvent it!
>
> On Fri, July 13, 2007 9:54 am, travers wrote:
>>
>> Hi is it possible to specify href in <s:div to render content as an image
>> ?
>> I have a struts2 action returning a JfreeChart chart as png.
>>
>> Without ajax, <image src="/chart/ViewChart.action"/> shows the chart
>> correctly, but the following renders it as text (well actually the binary
>> stuff inside the png)
>>
>> <s:url id="ajaxCallUrl" value="/chart/ViewChart.action"/>
>> <s:div theme="ajax"
>> href="%{ajaxCallUrl}" loadingText="Loading Chart...">
>> </s:div>
>>
>> --
>> View this message in context:
>> http://www.nabble.com/Rendering-an-image-into-%3Cs%3Adiv-from-ajax-tf4074632.html#a11580059
>> Sent from the Struts - User mailing list archive at Nabble.com.
>>
>>
>> ---------------------------------------------------------------------
>> To unsubscribe, e-mail: user-unsubscribe@struts.apache.org
>> For additional commands, e-mail: user-help@struts.apache.org
>>
>>
>
>
> ---------------------------------------------------------------------
> To unsubscribe, e-mail: user-unsubscribe@struts.apache.org
> For additional commands, e-mail: user-help@struts.apache.org
>
>
>
--
View this message in context: http://www.nabble.com/Rendering-an-image-into-%3Cs%3Adiv-from-ajax-tf4074632.html#a11580993
Sent from the Struts - User mailing list archive at Nabble.com.
---------------------------------------------------------------------
To unsubscribe, e-mail: user-unsubscribe@struts.apache.org
For additional commands, e-mail: user-help@struts.apache.org
Re: Rendering an image into
Posted by "Frank W. Zammetti" <fz...@omnytex.com>.
In general with AJAX this isn't possible... there's no way at present to
insert binary data, be it an image, PDF, whatever, into the page, and have
the browser render it.
What you would have to do is return HTML instead, which includes an <img>
tag pointing to the image on the server, which in this case would be your
chart, written out somewhere with some ID. For instance, you might write
it to a database, using some unique identifier for the user as a key, and
then your <img> tag points to an Action, with the ID as a query string,
that retrieves the image from the database based on the ID.
So it would go something like:
User clicks generate chart button --> Server generates chart, writes to DB
---> Return HTML like <img src="getChart.action?id=1234"/> --> HTML
inserted into page, browser requests getChart.action to get image, which
is an Action, not an image --> Action retrieves image from DB and returns
it --> Chart displayed
Frank
--
Frank W. Zammetti
Founder and Chief Software Architect
Omnytex Technologies
http://www.omnytex.com
AIM/Yahoo: fzammetti
MSN: fzammetti@hotmail.com
Author of "Practical Ajax Projects With Java Technology"
(2006, Apress, ISBN 1-59059-695-1)
and "JavaScript, DOM Scripting and Ajax Projects"
(2007, Apress, ISBN 1-59059-816-4)
Java Web Parts - http://javawebparts.sourceforge.net
Supplying the wheel, so you don't have to reinvent it!
On Fri, July 13, 2007 9:54 am, travers wrote:
>
> Hi is it possible to specify href in <s:div to render content as an image
> ?
> I have a struts2 action returning a JfreeChart chart as png.
>
> Without ajax, <image src="/chart/ViewChart.action"/> shows the chart
> correctly, but the following renders it as text (well actually the binary
> stuff inside the png)
>
> <s:url id="ajaxCallUrl" value="/chart/ViewChart.action"/>
> <s:div theme="ajax"
> href="%{ajaxCallUrl}" loadingText="Loading Chart...">
> </s:div>
>
> --
> View this message in context:
> http://www.nabble.com/Rendering-an-image-into-%3Cs%3Adiv-from-ajax-tf4074632.html#a11580059
> Sent from the Struts - User mailing list archive at Nabble.com.
>
>
> ---------------------------------------------------------------------
> To unsubscribe, e-mail: user-unsubscribe@struts.apache.org
> For additional commands, e-mail: user-help@struts.apache.org
>
>
---------------------------------------------------------------------
To unsubscribe, e-mail: user-unsubscribe@struts.apache.org
For additional commands, e-mail: user-help@struts.apache.org