Newbie: calculation in a field & datasource with same tags

[martham]

1. Hi,  I am new to Jasper. My question is how can i perform a calculation of 2 fields in 1 . e.g. $F{rsp}  = $F{cost_price} + $F{tax}? do i do this in  the Text Field Expression?

2. I am using XML as my data source, 8 nodes have the same name tags, i want to use the 7th note to access the address from it, my template is displaying the wrong address from one of the nodes.

Please help. thanks.

<comp>
   <address> 12 This one gets
   <address> Displayed
<comp>
   <address>
   <address>
<comp>
   <address>34 Whereas I want
   <address>ThisOne
<comp>
   <address>
   <address>

 

 

 

[ghudson_1]

1. You can do a calculation right within an expression of a textfield.  It could be simple math, or it could be other java or groovy statements, let's say you're mixing string and integer 'calculations':

<textFieldExpression><![CDATA[string.valueOf($F{FreightColumn}.intValue() * 100) + "-" + String.valueOf(($F{FreightColumn}.intValue() + 1) * 100)]]></textFieldExpression>

You can also use variables to do the calculation with different reset intervals, etc, then print the value of the variable in the textfieldexpression... or do some math with the variable if needed:
http://community.jaspersoft.com/wiki/variables

2. XML datasource sample is here - does this help - http://jasperreports.sourceforge.net/sample.reference/xmldatasource/index.html#xmldatasource