Menu
I want to do a comparison such as:
if <field> == 0 then "-" Can somebody tell me the syntax using JasperReports?
614
Jasper Reports doesn't support if-else statements when defining variable expressions. Instead you can use the ternary operators {cond} ? {statement 1} : {statement 2}. You can nest this operator inside a Java expression to obtain the desired output based on multiple conditions.
If you want to compare string fields then use . equals() function instead of == operator. In Java, the == operator compares if the objects are the same instance while . equals() compares the state of object.
JasperReports doesn't support if-else statements when defining variable expressions. Instead, you can use the ternary operators {cond} ? {statement 1} : {statement 2}. This operator can be nested inside a Java expression to obtain the desired output based on multiple conditions.
jrxml is a human readable XML file that contains the report template i.e. report structure and its formatting rules. . jasper is the compiled report template i.e. compiled . jrxml file.
iReport (JasperReports) uses a Ternary operator. For example, consider the following logic:
IF boolean condition THEN execute true code ELSE execute false code END IF Using a ternary operator, this becomes:
boolean condition ? execute true code : execute false code When using a variable with the following expression:
$F{column_value}.intValue() == 42 ? "Life, Universe, Everything" : "Naught" Then the variable's value would be "Life, Universe, Everything" if, and only if, the integer value of $F{column_value} is equal to 42.
Where things get a little obtuse is when you have to have nested conditions. For these, put the nested conditions in parenthesis and on a separate line:
condition1 ? (condition2 ? true_code2 : false_code2) : false_code1 So when you need to do many of them:
condition1 ? (condition2 ? (condition3 ? true_code3 : false_code3) : false_code2) : (condition4 ? true_code4 : false_code4) example of expression in ireport:
( $F{foo} == 0 ? "Planned" : $F{foo} == 1 ? "Reserved" : $F{foo} == 2 ? "Canceled" : $F{foo} == 3 ? "Absent" : $F{foo} == 4 ? "Complete" : "Unknown" ) If you love us? You can donate to us via Paypal or buy me a coffee so we can maintain and grow! Thank you!
Donate Us With
