Conditional block: Specify a variable based on which 
objects inserted into a 
block can be conditionally rendered.
for example user can have option for List report or chart 
report when he runs the report.
Try this out........
CONDITIONAL BLOCKS
The goal of this report is to prompt users on which display 
they would prefer, a list or a chart.
To start, create a simple list report in Report Studio. 
Using the Cognos sample data, product line, order method 
and revenue are added to the list. From the toolbox, drag 
and place a pie chart below the list. Select the chart and 
in the properties pane, attach this chart to query 1:
 
 
 
 
Now the chart can be populated from the data items tab.
 
 
 
 
The consumers of this report need the ability to choose 
between the displays they want to see. To accomplish this, 
build a blank prompt page allowing them to select from a 
drop down list either list or chart. Drag a value prompt to 
the prompt page with the following settings:
 
 
 
At this point hit ‘Finish”. The dropdown list has to be 
populated manually though the static choices property of 
the value prompt. The two choices added are list and chart.
 
 
 
 
 
*You can leave the display value blank. If you do so, 
Report Studio is smart enough that it will take the use 
value for the display value.
Now that my prompt page is set, return to the Report Page. 
In order to conditionally display an object, use the 
conditional blocks object in the toolbox. Drag this to the 
bottom of the report.
 
 
 
 
The next step is to attach the variable to the conditional 
blocks block variable property. This variable is a Boolean 
variable that either equals a list or doesn’t.
 
 
 
 
 
 
 
 
We need to test if our parameter is equal to the 
value ‘List’. If the user selected List this expression 
will evaluate to true, if the user selected ‘Chart’ from 
the prompt, then this will evaluate to false.
After this step is completed there is a new property on the 
conditional blocks object that tell us which block we are 
currently looking at. First, drag the chart into the ‘No’ 
block.
 
 
 
 
 
Now, select the conditional block again, and switch the 
current block property to ‘Yes’. The conditional blocks 
object appears empty because there is currently nothing in 
the ‘Yes’ block.
 
 
 
The final step is to drag the entire list inside the ‘Yes’ 
block.
 
 
 
Now when the report is run, the user will be prompted for 
their display of choice.