ViewToken Object Type
Important: The Vega SDK supports many of the React Native version 0.72 components and APIs. You can use the supported components and APIs in the same manner as an ordinary React Native app. This page lists a specific React Native feature supported by the Vega SDK and contains React Native v72 documentation from the reactnative.dev website created by Meta and other contributors and licensed under the Attribution 4.0 International License. For more information about React Native v72, see the React Native documentation, version 0.72. For the most current feature information, see the Release Notes.
ViewToken object is returned as one of properties in the onViewableItemsChanged callback, for example in FlatList component. It is exported by ViewabilityHelper.js.
Example
{
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
Last updated: Sep 30, 2025
