Parameter based on parameter

[leesy84]

Hi

 

I have developed a report in iReport using 3 parameters and a jar file i have written. This first parameter is a filename the second a number both of these are prompted for the third parameter isn't prompted for and simply has a default value which is calling a java method i have wrote passing it the filename entered as param1.

 

This all works fine and runs on iReport however when i came to add it on jasperserver i add two controls to my report for filename and the number but don't add the third one as the default value will be picked up from the jrxml file? If i do this it seems to evaluate the thrid parameter before asking me for the filename so i get a filenotfound exception in my jar as it is being passed null. If i add it as a control i can't set the default value, or set the type to java.util.List and also i can also set prompt on all three controls not the individually.

 

I am sorry this is a long post it is my first post and not sure how much detail i need to enter

 

Thanks in advance for any help

 

Cheers

 

Daniel Lees

[lucianc]

JasperServer evaluates the default value expression for all parameters in order to provide initial values for the report input control.

 

A solution for your case is to write a default value expression (for the third parameter) that checks whether the first parameter has a value:

Code:

<parameter name="Param1"/>
<parameter name="Param2"/>
<parameter name="Param3">
  <defaultValueExpression>
    $P{Param1} == null ? null : ..your expression..
  </defaultValueExpression>
</parameter>

 

We could change JasperServer to silently ignore exceptions thrown while evaluating parameter default value expressions. If you think this should be done, please log it as a bug [url=http://jasperforge.org/sf/tracker/do/listArtifacts/projects.jasperserver/tracker.bugs]here.

 

Regards,

Lucian

[massimiliano.oreto]

Doesn't work for me . Parameter 1 inside parameter 3 is always null