Component going to infinite renders, if I update state in On Blur

[avp1598]

On Blur event keeps getting triggered infinitely if some state is changed in on blur callback I have checked all useEffects and everything, the problem is with the component itself. Just the onBlur event being called infintely and for any type of cell update.

I am using a dynamicDatasheet as I need the columns to be dynamic

[nick-keller]

Thx for the report @avp1598, Can you provide a sandbox to demonstrate the issue?

[kivircik-parantez]

On Blur event keeps getting triggered infinitely if some state is changed in on blur callback I have checked all useEffects and everything, the problem is with the component itself. Just the onBlur event being called infintely and for any type of cell update.

I am using a dynamicDatasheet as I need the columns to be dynamic

const [selectionState, setSelectionsState] = useState<SelectionWithId | null>(null);  
const selectionCallback = useCallback(
    (opt: { selection: SelectionWithId | null }) => {
      if (!_.isEqual(opt.selection, selectionState)) {
        setSelectionsState(opt.selection ?? selectionState);
      }
    },
    [selectionState]
  );```

I solved the problem by giving onSelectionChange to selectionCallback . If it helps. @avp1598 

[larissa-n]

https://codesandbox.io/s/fervent-khayyam-oqzfps?file=/src/App.js

@nick-keller you'll notice: AFTER the table was focused & blurred at least once, the onBlur function is fired EVERY TIME you add a row or "generate table data", i.e. every time you update table state externally.

This seems like a bug.

[larissa-n]

https://github.com/nick-keller/react-datasheet-grid/blob/92fdf7d0e01e4ccdd1385423efc4abf7b714eaf9/src/components/DataSheetGrid.tsx#L1728

Is the lastEditingCellRef reset after an onBlur event?

[larissa-n]

By the way, I think it would be neat if the onBlur event had a newValue argument like onChange does. Would make it more robust in cases where onBlur is used to get the new state, like if getting the new table state with every keystroke is performance overkill. As it is, you'd have to sync from the spreadsheet controlled state variable onBlur, which is a problem if onBlur fires every time you sync to the table controlled state. Thanks!

Also: Pasting into the datasheet (incl. clicking in and out) does not trigger an onBlur event, right? Should it?

[larissa-n]

onSelectionChange is triggered every time anything about the spreadsheet content changes, the spreadsheet first renders, re-renders, an undo-function changes its state, and on every single keystroke when typing in a cell. Not sure if that's as intended, as the Docs say it should only be called when the selection changes or the grid is blurred.

Sandbox: https://codesandbox.io/s/cool-platform-8083xp?file=/src/App.js

[larissa-n]

@nick-keller any updates on this yet? Thank you!