Select only one choice in grid selection

Question

Hello, I'd like to be able to select only one choice in a grid selection at the same time. Is there a way to force that? 
 OriginalPostID-202357 
 OriginalPostID-202357

Mike Schmitt · Answer

manisht209 - "it works for me, i.e retains the previous selected value." 
 You're right - I suppose what I should really say instead is "there's no way to disable the select all control, as it will not give the user their desired results" - but I never thought to try retaining the original selection. I will try incorporating something similar into my current code. 
 The following should take that into account, plus if the user clicks "select all" when nothing is selected yet, the selection will remain empty in this version. 
 (Note that this code, as well as your code, both have a quirk when "select all" is clicked on a page containing 2 items - I can't find an easy way around this but it's probably not a big deal) 
 saveInto: {
 a!save(
 local!gridSelection,
 a!gridSelection(
 pagingInfo: save!value.pagingInfo,
 selected: if(
 length(save!value.selected) > 2, /* override if "select all" was clicked: retain original value */
 local!gridSelection.selected,
 index(
 save!value.selected,
 length(save!value.selected), /* for normal clicks, this will correctly capture the first or any subsequent click, as well as a de-select click */
 {}
 )
 )
 )
 )
}

Mike Schmitt · Answer

This is a very old thread, and several of the original comments contain robust and still-working solutions to this. Though with the advent of the 19.2+ paging grid, all of this is a bit out-of-date. For instance, designers now have the ability to turn off selection for all rows other than a single selected row, among other possible options.

manisht209 · Answer

I had a similar requirement and didn&#x27;t want to give a validation error message. The intention is to automatically change the selection to the latest selected value in the grid. When User selects check all it persists the value that was selected before this operation. This is done as below in Grid&#x27;s SaveInto saveInto: {
 local!gridSelection,
 a!save(
 local!gridSelection.selected,
 if(
 rule!APN_isEmpty(
 local!gridSelection.selected
 ),
 {},
 if(
 length(
 local!gridSelection.selected
 ) > 2,
 index(
 local!gridSelection.selected,
 1,
 ""
 ),
 index(
 reverse(
 local!gridSelection.selected
 ),
 1,
 ""
 )
 )
 )
 )
}

Mike Schmitt · Answer

I find the official appian SAIL recipe approach of throwing a validation error to be unnecessary and kinda clunky, no offense, and to be quite honest it doesn't make much sense to me that after all this time they've never engineered the paging grid component to contain a "singleSelect" parameter (or alternatively "maxSelections" for greater flexibility) where the "select all" control will be hidden when # of selections is restricted (or at least, smaller than the current page size). 
 Out of necessity I've developed the following code which handles the single-select use case pretty strongly IMHO, and it has been refined quite a bit over the past 3 years or so: 
 saveInto: {
 a!save(
 local!gridSelection,
 a!gridSelection(
 pagingInfo: save!value.pagingInfo,
 selected: index(
 save!value.selected,
 length(save!value.selected),
 {}
 )
 )
 )
} 
 This code does similar to what some of the prior examples here suggest, though a bit more compact, and automatically handles the use case of de-selecting the current selected item. Note that there's currently no way to avoid the behavior where clicking the "select all" control causes the last item on the current page to be selected, as mentioned above - this is probably the single strongest reason there really needs to be an OOB control for restricting the number of selections.

Select only one choice in grid selection

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