Match selected values in expression

[#1]

Hi

Lets say i load the following inline table

LOAD * INLINE [
 Id, Value
 1, A
 2, B
];

and the following variables

SET A = 1;
SET B = 2;

Then I create a Listbox with field "Value", so the user can select none of them, all of them or just one of them.

Then I create a chart where the expression in the chart will depend on if one of the values is selected. I.e. I would like an expressions like

IF(IsSelected(Id, A), ..., ...)

I have looked at the GetFieldSelections() function but that will not give me the "Id" field when the selectbox displays the "Value" field.

Is this possible? If so what would be the simpliest and most elegant way of doing this? I could always match the "Value" but I don't want to if I don't have to.

br
Per-Anders Söderqvist