Implementing your own JRHyperLinkListener

By: Bill Fritz - bfritz2
Implementing your own JRHyperLinkListener
2003-01-08 14:42
I have create a report that uses hyperlinkType="RemoteAnchor". When I view the report (using JasperViewer) I would like the referenced report to appear. I know I need to implement my own JRHyperLinkListener to manage this event. However, I would like a liitle more information on what is involved in order to do this. Thanks,
Bill




By: Teodor Danciu - teodord
RE: Implementing your own JRHyperLinkListener
2003-01-09 03:25

Hi,

The JRViewer component itself implements this
listener interface to respond to your clicks in the
JasperViewer. It deals only with some simple types
of hyperlink references like the local references.

You will have to create your own viewer that uses
the JRViewer component, just like the supplied
JasperViewer does.

Then, you implement this JRHyperlinkListener
interface in one of your classes and add an
instance of it to the JRViewer component using
the addHyperlinkListener() method.

You can see this in the "webapp" sample, where
the ViewerFrame class represent such a new viewer. You can click on the Google link and it
will redirect the browser to that URL.

However, only adding the new listener, will not
suppress the display of those "recommendations"
on the console, but this is something I could fix
for you in the next version, so that you don' have
to remove the original listener just to get rid of them.

I hope this helps.
Teodor





By: Bill Fritz - bfritz2
RE: Implementing your own JRHyperLinkListener
2003-01-14 06:39
I have followed your advice (thank you by the way) and have everything working. I have another question concerning memory use efficiency. A little background information for the problem will help. I have created a top level report with summary information which has links to individual reports (each with its own set of subreports, etc.). The links are of type hyperlinkType="RemoteAnchor" and they all refer to .jrprint files. I have implemented my own JRHyperLinkListener as you described. Here is a code fragment for that.

try
{
this.pnlMain.remove(viewer);
viewer = new JRViewerPlus(hyperlink.getHyperlinkReference(), false);
viewer.addHyperlinkListener(this);
this.pnlMain.add(viewer, BorderLayout.CENTER);
this.pnlMain.revalidate();

}
catch (JRException e)
{
JOptionPane.showMessageDialog(this, e.getMessage());
}

My questiion is: Is there a more efficient way of handling this link other than creating a new JRViewerPlus object each time the link event occurs? It is likely that the user will go back and forth from the top level report to these individual reports many times. I looked at the source code, but the methods that I need (in JRViewer) like loadReport are all private and I do not have access to them.

Any suggestions would be most appreciated.

Thanks,
Bill




By: Teodor Danciu - teodord
RE: Implementing your own JRHyperLinkListener
2003-01-14 07:10

Hi,

Make public or protected all the methods or fields
you need. Then, if everything is OK, we'll make
all these modifications available in the main version
of the library.

This way I could have some feedback from you
in this direction.

Thank you,
Teodor