Implementing your own JRHyperLinkListener

[2002 JI Open Discussion]

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