Preserve the selected grid value when a row is double-clicked.

Question

I'm trying to simulate a double-click-like behavior in a read-only grid using a!gridField_24r3 . The goal is to return a selected row's value when a user clicks on a field grid value twice. 
 I am able to save the value of the grid after selecting it for the very first time by using fv!deselectedRows. Refer below code: a!save(
 local!previousSelectedRow,
 if(
 length(local!currentSelectedRow) = 0,
 index(fv!deselectedRows, 1, null),
 local!previousSelectedRow
 )
 ) 
 Now within the parameter "selectionvalue" of a!gridField_24r3, I am trying to manipulate the value it holds with below logic where I put a condition if there is no selection made --> ri!selected will be empty but we have a value store within local!previousSelectedrow then we should get the id of that grid returned. 
 if(
 a!isNotNullOrEmpty(ri!selected),
 ri!selected, 
 if(
 a!isNotNullOrEmpty(tointeger(property(local!previousSelectedRow, "id", null))),
 property(local!previousSelectedRow, "id", null),
 null
 )
)
 
 But selectionvalue is not getting updated. Its only holding the values on selection. Could anyone guide me here.

Shubham Aware · Accepted Answer

SelectionValue is read-only - it only displays the current selection state. You can't use it to force selections. When a user deselects, Appian clears the selection internally and your conditional logic in selectionValue won't override this. Use selectionSaveInto to detect the double-click pattern: selectionSaveInto: {
 a!save(ri!selected, save!value),
 if(
 and(
 length(save!value) = 0, /* Deselected */
 length(fv!deselectedRows) = 1, /* Single row deselected */
 fv!deselectedRows[1] = local!lastSelectedRow /* Same row */
 ),
 /* Trigger double-click action */
 a!save(local!doubleClickedRow, fv!deselectedRows[1]),
 a!save(local!lastSelectedRow, fv!selectedRows[1])
 )
}

Stefan Helzle · Answer

There is no double-click in Appian. You could do a "very slow two clicks" thingy, but I am pretty sure this does not meet your users expectations.

Harsha Sharma · Answer

As per good design practice number of clicks should be reduced for good UX. I would suggest to have single click selection instead of double (read 2 single) clicks as they are more user friendly.

Preserve the selected grid value when a row is double-clicked.

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