Independent "Back Selection" functionality

[vlad_komarov]

Hello,

In my application I am doing some UI manipulations based on list of items selected in the list box.

I need to create a “Back Selection” functionality for this Field and this functionality should be independent from standard QV Back / Forward operations.

Seems like straightforward process: using “SelectinField” action with parameter of string constructed from items selected one step back.

I am using the a variable vBack = '(' & Concat({$1}[FIELD_1], '|') &')' which gives me the proper sting in all cases except one:

It return ALL items listed in FIELD_1 when I am selecting any item first time the selection is made (after no selections were made).

I was trying to use GetFieldSelections() or GetSelectedCount(), but they do not have a SetAnalysis option for Previous step {$1}.

Any suggestions about how to handle this issue?

Regards,

Vladimir

[settu_periasamy]

Hi,

May be like this..

vBack  = If(GetSelectedCount([FIELD_1])>0,'(' & Concat({$1}[FIELD_1], '|') &')' ,'')

[jonathandienst]

Is that really a problem? Selecting all items is the same as selecting nothing (assuming no nulls). Is that not the correct 'back' state when you make your first selection?

[vlad_komarov]

Jonathan,

Yes, in QV selections terms, "No Selections" = "All Selected". But I am using these selections to activate corresponding columns in a large straight table. So "No Selections" means no columns are visible. Selecting all items will force all columns in straight table to be displayed. Trying to avoid that...

Vladimir

[#5]

it sounds like what you want to do is make the coluns conditional.  You can use the conditional attribute on an expression or dimension - when you activate you would place the expression that you would want to column to appear.  If the expression is not satisfied, the dimsion or expression does not appear

[vlad_komarov]

Adam,

I am pretty familiar with "Conditional" option and how to show/hide individual column(s).

The question was about different thing - how to use List Box selections to activate this option in each column.

Vladimir