Editable Grid

18.2 introduces a feature called "ROW_HIGHLIGHT". which can solve the header checkbox issue. Instead of selecting checkbox, you can click anywhere on your row to select it.
In the previous versions, you cannot remove the select all checkbox. However you can design your grid to only allow one selection at a time which will automatically not allow you to check the select all checkbox.

You can make use of the selection disabled feature of a!gridRowLayout() for that or you can write a logic that would allow only one selection and automatically uncheck the previous selection if any.

There is no provision to opt out Select All checkbox. Either you can have selection or you can disable it completely.
As I can see you are using validations to ensure single item selection, whereas there is a logic for ensuring that only 1 item is selected at any point of time and this saves repetitive user clicks/actions. You can write that logic in selectionSaveInto.
Hope I answered the question to your satisfaction, please let me know if otherwise.

Hi paragk998 

The same functionality can be achieved without taking an additional column of radio button. 

Single selection can be achieved by writing the below logic in selectionSaveInto.

selectionValue: ri!selectedIndex_int,
selectionSaveInto: {
ri!selectedIndex_int,
if(
count(ri!selectedIndex_int)=count(local!items),
a!save(ri!selectedIndex_int,1),
if(count(ri!selectedIndex_int)>1,ri!selectedIndex_int<<ldrop(ri!selectedIndex_int,1),{})
)
}
)

Please check the code snippet attached. Let me know if it helps.

Regards,

Sidhant Behura

=load(
  local!items: {
    {id:1, item: "Item 1", qty: 1, unitPrice: 10},
    {id:2, item: "Item 2", qty: 2, unitPrice: 20},
    {id:3, item: "Item 3", qty: 3, unitPrice: 30},
    {id:4, item: "Item 4", qty: 4, unitPrice: 40}
  },
  local!selected,
  a!gridLayout(
    label: "Grid Layout",
    instructions: "Selected: " & ri!selectedIndex_int,
    headerCells: {
      a!gridLayoutHeaderCell(label: "Item"),
      a!gridLayoutHeaderCell(label: "Qty", align: "RIGHT"),
      a!gridLayoutHeaderCell(label: "Unit Price", align: "RIGHT"),
      a!gridLayoutHeaderCell(label: "Total", align: "RIGHT")
    },
    rows: {
      a!forEach(
        items: local!items,
        expression: a!gridRowLayout(
        id: fv!index,
        contents: {
            a!textField(
            value: fv!item.item,
            saveInto: fv!item.item
          ),
          a!integerField(
            value: fv!item.qty,
            saveInto: fv!item.qty,
            align: "RIGHT"
          ),
          a!floatingPointField(
            value: fv!item.unitPrice,
            saveInto: fv!item.unitPrice,
            align: "RIGHT"
          ),
          a!textField(
            value: dollar(tointeger(fv!item.qty) * todecimal(fv!item.unitPrice)),
            readOnly: true,
            align: "RIGHT"
          )
        }
      )
        
      )
      
      
    },
    selectable: true,
    selectionValue: ri!selectedIndex_int,
    selectionSaveInto: {
      ri!selectedIndex_int,
      if(
        count(ri!selectedIndex_int)=count(local!items),
        a!save(ri!selectedIndex_int,1),
        if(count(ri!selectedIndex_int)>1,ri!selectedIndex_int<<ldrop(ri!selectedIndex_int,1),{})
      )
      
      
     }
  )
)

You could also use an image field displaying a checkbox.

load(
  local!data: {
    1,2,3
  },
  local!selectedIndex,
  a!gridLayout(
    label: "Editable Grid",
    labelPosition: "ABOVE",
    headerCells: {
      a!gridLayoutHeaderCell(label: ""),
      a!gridLayoutHeaderCell(label: "Data")
    },
    columnConfigs: {
      a!gridLayoutColumnConfig(width: "ICON"),
      a!gridLayoutColumnConfig(width: "DISTRIBUTE")
    },
    rows: a!forEach(
      items: local!data,
      expression: a!gridRowLayout(
        contents: {
          a!imageField(
            images: a!documentImage(
              document: if(
                fv!index = tointeger(local!selectedIndex),
                cons!CHECKBOX_CHECKED,
                cons!CHECKBOX
              ),
              link: a!dynamicLink(
                saveInto: if(
                  tointeger(local!selectedIndex) = fv!index,
                  a!save(
                    target: local!selectedIndex,
                    value: null
                  ),
                  a!save(
                    target: local!selectedIndex,
                    value: fv!index
                  )
                )
              )
            )  
          ),
          a!textField(
            value: fv!item
          )
        }
      )
    )
  )
)