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MIGRATION_V9.md

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Migration from v8 to v9

Downshift v8 receives a list of breaking changes, which are necessary to improve both the user and the developer experience. The changes are only affecting the hooks and are detailed below.

Table of Contents

onChange Typescript Improvements

The handlers below have their types improved to reflect that they will always get called with their corresponding state prop:

  • useCombobox

    • onSelectedItemChange: selectedItem is non optional
    • onIsOpenChange: isOpen is non optional
    • onHighlightedIndexChange: highlightedIndex is non optional

  • useSelect

    • onSelectedItemChange: selectedItem is non optional
    • onIsOpenChange: isOpen is non optional
    • onHighlightedIndexChange: highlightedIndex is non optional
    • onInputValueChange: inputValue is non optional

  • useMultipleSelection

    • onActiveIndexChange: activeIndex is non optional
    • onSelectedItemsChange: selectedItems is non optional

getA11ySelectionMessage

The prop has been removed from useSelect and useCombobox. If you still need an a11y selection message, use either getA11yStatusMessage or your own aria-live implementation inside a onStateChange callback.

getA11yRemovalMessage

The prop has been removed from useMultipleSelection. If you still need an a11y removal message, use either getA11yStatusMessage or your own aria-live implementation inside a onStateChange callback.

getA11yStatusMessage

The prop has been also added to useMultipleSelection, but has some changes reflected in each of the hook's readme.

  • there is no default function provided, so you will not get any aria-live message anymore if you don't provide the prop directly to the hooks.
  • the function is called only with the hook's state, and you should already have access to the props, such as items or itemToString. Values such as highlightedItem or resultsCount have been removed, so you need to compute them yourself if needed.
  • Downshift is not affected, it has the same getA11yStatusMessage as before, no changes there at all.

The HTML markup with the ARIA attributes we provide through the getter props should be enough for screen readers to report:

  • results count.
  • highlighted item.
  • item selection.
  • what actions the user can take.

If you need anything more specific as part of an aria-live region, please use the new version of getA11yStatusMessage or your own aria-live implementation.

References:

selectedItemChanged

This prop has been removed from useCombobox. You should use itemToKey instead.

Reference:

itemToKey docs