ViewToken Object Type

ViewToken object is returned as one of properties in the onViewableItemsChanged callback, for example in FlatList component. It is exported by ViewabilityHelper.js.

{
  item: { key: "key-12" },
  key: "key-12",
  index: 11,
  isViewable: true
}

Keys and values

index

Unique numeric identifier assigned to the data element.

Type	Optional
number	Yes

isViewable

Specifies if at least some part of list element is visible in the viewport.

Type	Optional
boolean	No

item

Item data

Type	Optional
any	No

key

Key identifier assigned of the data element extracted to the top level.

Type	Optional
string	No

section

Item section data when used with SectionList.

Type	Optional
any	Yes

Used by

• FlatList
• SectionList
• VirtualizedList