Dynamically adding sub-reports

[n00b]

Hello,

I am using jasper reports for some time and it has been a smooth experience so far with charts and tables.

Now, My current situation is like this:

my report (lets call it experiment report) contains the following things:

• a bar chart (barchart.csv)
• a timeline chart (timechart.csv)
• a table (table.csv)

I have multiple csv files which i use as a data source for each of the above elements.

Now, my current requirement is that i create multiple instances of the same report above mentioned. i.e. There will be a master report which will contain the above experiment report as a subreport and there can be N number of experiments.

So, the final report should have the following things:

• Experiment1
  • a bar chart (barchart-e1.csv)
  • a timeline chart (timechart-e1.csv)
  • a table (table-e1.csv)
• Experiment2
  • a bar chart (barchart-e2.csv)
  • a timeline chart (timechart-e2.csv)
  • a table (table-e2.csv)

And there can be N number of experiments. (it will be decided on run time)

I will have different set of csv files for each elements. but my question is how do i include multiple subreports at runtime because the template (jrxml file) is created only once.

Is it possible through jasper report APIs? or any other way?

-n00b

[pawel_r]

Well, I am not an expert in this matter, but I am afraid it is not possible with jasperreports API.

The solution should be possible to obtain with some external XML templating tool, like Velocity.

There is a great article (accessible from jasperreports Docs) about that:

http://www.ibm.com/developerworks/websphere/library/techarticles/0505_olivieri/0505_olivieri.html

 

BTW: How are planing on generating multiple cascade styles for your report (just curiosity :) )

Post Edited by pawel_r at 09/04/2009 11:21

[n00b]

Hi,

Thanks for the article, it seems my problem would be resolved using velocity engine.

I will try it with a simple report first of all and will let everyone know whether it worked or not.

 

-n00b

[sergeleo]

I'm using Velocity for my report. Hint! I noticed that Velocity engine mistranslates Jasper's parameters while processing template. My workaround is to set Velocity variable and pass value to Jasper Parameter/Variable.

[n00b]

Yes, i tried it with a simple report and it seems to be working with Velocity!

Thanks everyone. :)