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Used for filtering columns in a 3D-grid. If you want to dynamically exclude a column (an element in a 3D-grid), use this field to create a Jscript-expression that evaluates to a Boolean value (true or false), in the same way as when you create a condition. If this value is evaluated to ‘true’ the column is displayed, otherwise if this value is evaluated to ‘false’ the column is not displayed. If you leave the field empty, the column is always displayed.
If we set up a 3d-grid question called "time" with a numeric list question for each of the TV channels, there will be one column for each channel - .
The "time" 3d-grid from the Survey tree
We can filter these columns based on the answers to the "TVchannel" question by including conditions such as f("TVchannel").inc("1") in the "column mask" for each of them - .
Figure 1 - Properties of the "abc" multi question in the 3D-grid
The result will then be that only the channels answered in the "TVchannel" question will be displayed - :
Figure 2 - The resulting "Time spent" question