Change value of input control by selecting others

[ky5566]

:P

I am new to jasper. I wonder if there is a way to change the value of a list input control by selecting some value in other list.

 

 

 

For example in my report there are two list course and subject, which each course has 6 subjects. If I change the value of course_list from A to B, and then in list of subject was changed from the subjects of A to the subjects of B.

 

 

 

I have tried to load the data to course_list and subject_list from database. I create a parameter to store course value and the sql query of subject_list is: select subject_name from table where course=$P{course}. But it give me exception: java.lang.Exception: 1 -java.lang.NullPointerExceptionÂ

I think the parameter is not assigned any value at that stage.

 

 

 

 

Thanks million for helping!

 

Post edited by: ky5566, at: 2007/08/09 15:12

Post edited by: ky5566, at: 2007/08/10 10:41

[ky5566]

:sick: ? no body know that?

[lucianc]

If you're talking about JasperServer, this scenario is not yet supported. Such a feature is targeted for future versions.

 

Regards,

Lucian