Interface: VirtuosoProps<D, C>
Type parameters
| Name |
|---|
D |
C |
Hierarchy
↳
VirtuosoProps
Properties
alignToBottom
• Optional alignToBottom: boolean
Setting alignToBottom to true aligns the items to the bottom of the list if the list is shorter than the viewport.
Use followOutput property to keep the list aligned when new items are appended.
Defined in
dist/index.d.ts:1019
atBottomStateChange
• Optional atBottomStateChange: (atBottom: boolean) => void
Type declaration
▸ (atBottom): void
Called with true / false when the list has reached the bottom / gets scrolled up.
Can be used to load newer items, like tail -f.
Parameters
| Name | Type |
|---|---|
atBottom | boolean |
Returns
void
Defined in
dist/index.d.ts:1002
atBottomThreshold
• Optional atBottomThreshold: number
The property accepts pixel values.
By default 4. Redefine to change how much away from the bottom the scroller can be before the list is not considered not at bottom.
Defined in
dist/index.d.ts:1043
atTopStateChange
• Optional atTopStateChange: (atTop: boolean) => void
Type declaration
▸ (atTop): void
Called with true / false when the list has reached the top / gets scrolled down.
Parameters
| Name | Type |
|---|---|
atTop | boolean |
Returns
void
Defined in
dist/index.d.ts:1006
atTopThreshold
• Optional atTopThreshold: number
The property accepts pixel values.
By default 0. Redefine to change how much away from the top the scroller can be before the list is not considered not at top.
Defined in
dist/index.d.ts:1037
components
• Optional components: Components<D, C>
Use the components property for advanced customization of the elements rendered by the list.
Defined in
dist/index.d.ts:915
computeItemKey
• Optional computeItemKey: ComputeItemKey<D, C>
If specified, the component will use the function to generate the key property for each list item.
Defined in
dist/index.d.ts:923
context
• Optional context: C
Additional context available in the custom components and content callbacks
Defined in
dist/index.d.ts:863
customScrollParent
• Optional customScrollParent: HTMLElement
Pass a reference to a scrollable parent element, so that the list won't wrap in its own.
Defined in
dist/index.d.ts:1027
data
• Optional data: readonly D[]
The data items to be rendered. If data is set, the total count will be inferred from the length of the array.
Defined in
dist/index.d.ts:859
defaultItemHeight
• Optional defaultItemHeight: number
By default, the component assumes the default item height from the first rendered item (rendering it as a "probe").
If the first item turns out to be an outlier (very short or tall), the rest of the rendering will be slower, as multiple passes of rendering should happen for the list to fill the viewport.
Setting defaultItemHeight causes the component to skip the "probe" rendering and use the property
value as default height instead.
Defined in
dist/index.d.ts:933
endReached
• Optional endReached: (index: number) => void
Type declaration
▸ (index): void
Gets called when the user scrolls to the end of the list. Receives the last item index as an argument. Can be used to implement endless scrolling.
Parameters
| Name | Type |
|---|---|
index | number |
Returns
void
Defined in
dist/index.d.ts:989
firstItemIndex
• Optional firstItemIndex: number
Use when implementing inverse infinite scrolling - decrease the value this property
in combination with data or totalCount to prepend items to the top of the list.
Warning: the firstItemIndex should be a positive number, based on the total amount of items to be displayed.
Defined in
dist/index.d.ts:980
fixedItemHeight
• Optional fixedItemHeight: number
Can be used to improve performance if the rendered items are of known size. Setting it causes the component to skip item measurements.
Defined in
dist/index.d.ts:944
followOutput
• Optional followOutput: FollowOutput
If set to true, the list automatically scrolls to bottom if the total count is changed.
Set to "smooth" for an animated scrolling.
By default, followOutput scrolls down only if the list is already at the bottom.
To implement an arbitrary logic behind that, pass a function:
<Virtuoso
followOutput={(isAtBottom: boolean) => {
if (expression) {
return 'smooth' // can be 'auto' or false to avoid scrolling
} else {
return false
}
}} />Defined in
dist/index.d.ts:969
headerFooterTag
• Optional headerFooterTag: string
Set to customize the wrapper tag for the header and footer components (default is div).
Defined in
dist/index.d.ts:973
increaseViewportBy
• Optional increaseViewportBy: number | { bottom: number ; top: number }
The property accepts pixel values.
Set the increaseViewportBy property to artificially increase the viewport size, causing items to be rendered before outside of the viewport.
The property causes the component to render more items than the necessary, but can help with slow loading content.
Using { top?: number, bottom?: number } lets you set the increase for each end separately.
Defined in
dist/index.d.ts:886
initialItemCount
• Optional initialItemCount: number
Use for server-side rendering - if set, the list will render the specified amount of items regardless of the container / item size.
Defined in
dist/index.d.ts:911
initialScrollTop
• Optional initialScrollTop: number
Set this value to offset the initial location of the list.
Warning: using this property will still run a render cycle at the scrollTop: 0 list window.
If possible, avoid using it and stick to initialTopMostItemIndex instead.
Defined in
dist/index.d.ts:906
initialTopMostItemIndex
• Optional initialTopMostItemIndex: number | IndexLocationWithAlign
Set to a value between 0 and totalCount - 1 to make the list start scrolled to that item.
Pass in an object to achieve additional effects similar to scrollToIndex.
Defined in
dist/index.d.ts:900
isScrolling
• Optional isScrolling: (isScrolling: boolean) => void
Type declaration
▸ (isScrolling): void
Called when the list starts/stops scrolling.
Parameters
| Name | Type |
|---|---|
isScrolling | boolean |
Returns
void
Defined in
dist/index.d.ts:984
itemContent
• Optional itemContent: ItemContent<D, C>
Set the callback to specify the contents of the item.
Defined in
dist/index.d.ts:919
itemSize
• Optional itemSize: SizeFunction
Allows customizing the height/width calculation of Item elements.
The default implementation reads el.getBoundingClientRect().height and el.getBoundingClientRect().width.
Defined in
dist/index.d.ts:939
itemsRendered
• Optional itemsRendered: (items: ListItem<D>[]) => void
Type declaration
▸ (items): void
Called with the new set of items each time the list items are rendered due to scrolling.
Parameters
| Name | Type |
|---|---|
items | ListItem<D>[] |
Returns
void
Defined in
dist/index.d.ts:1014
logLevel
• Optional logLevel: LogLevel
set to LogLevel.DEBUG to enable various diagnostics in the console, the most useful being the item measurement reports.
Ensure that you have "all levels" enabled in the browser console too see the messages.
Defined in
dist/index.d.ts:1049
overscan
• Optional overscan: number | { main: number ; reverse: number }
The property accepts pixel values.
Set the overscan property to make the component "chunk" the rendering of new items on scroll.
The property causes the component to render more items than the necessary, but reduces the re-renders on scroll.
Setting { main: number, reverse: number } lets you extend the list in both the main and the reverse scrollable directions.
See the increaseViewportBy property for a similar behavior (equivalent to the overscan in react-window).
Defined in
dist/index.d.ts:873
rangeChanged
• Optional rangeChanged: (range: ListRange) => void
Type declaration
▸ (range): void
Called with the new set of items each time the list items are rendered due to scrolling.
Parameters
| Name | Type |
|---|---|
range | ListRange |
Returns
void
Defined in
dist/index.d.ts:997
restoreStateFrom
• Optional restoreStateFrom: StateSnapshot
pass a state obtained from the getState() method to restore the list state - this includes the previously measured item sizes and the scroll location. Notice that you should still pass the same data and totalCount properties as before, so that the list can match the data with the stored measurements. This is useful when you want to keep the list state when the component is unmounted and remounted, for example when navigating to a different page.
Defined in
dist/index.d.ts:1055
scrollSeekConfiguration
• Optional scrollSeekConfiguration: false | ScrollSeekConfiguration
Use to display placeholders if the user scrolls fast through the list.
Set components.ScrollSeekPlaceholder to change the placeholder content.
Defined in
dist/index.d.ts:950
scrollerRef
• Optional scrollerRef: (ref: null | HTMLElement | Window) => any
Type declaration
▸ (ref): any
Provides access to the root DOM element
Parameters
| Name | Type |
|---|---|
ref | null | HTMLElement | Window |
Returns
any
Defined in
dist/index.d.ts:1031
startReached
• Optional startReached: (index: number) => void
Type declaration
▸ (index): void
Called when the user scrolls to the start of the list.
Parameters
| Name | Type |
|---|---|
index | number |
Returns
void
Defined in
dist/index.d.ts:993
topItemCount
• Optional topItemCount: number
Set the amount of items to remain fixed at the top of the list.
For a header that scrolls away when scrolling, check the components.Header property.
Defined in
dist/index.d.ts:895
totalCount
• Optional totalCount: number
The total amount of items to be rendered.
Defined in
dist/index.d.ts:855
totalListHeightChanged
• Optional totalListHeightChanged: (height: number) => void
Type declaration
▸ (height): void
Called when the total list height is changed due to new items or viewport resize.
Parameters
| Name | Type |
|---|---|
height | number |
Returns
void
Defined in
dist/index.d.ts:1010
useWindowScroll
• Optional useWindowScroll: boolean
Uses the document scroller rather than wrapping the list in its own.
Defined in
dist/index.d.ts:1023