GroupedList {shiny.fluent}

GroupedList

Description

A grouped list (GroupedList) allows you to render a set of items as multiple lists with various grouping properties.

For more details and examples visit the official docs. The R package cannot handle each and every case, so for advanced use cases you need to work using the original docs to achieve the desired result.

Usage

GroupedList(...)

GroupHeader(...)

Arguments

...

Props to pass to the component. The allowed props are listed below in the Details section.

Details

• className string
  Custom className

• compact boolean
  Boolean value to indicate if the component should render in compact mode. Set to false by default

• componentRef ⁠IRefObject<{}>⁠
  

• expandButtonProps ⁠React.HTMLAttributes<HTMLButtonElement>⁠
  Props for expand/collapse button

• footerText string
  Text to display for the group footer.

• group IGroup
  The group to be rendered by the header.

• groupIndex number
  The index of the group.

• groupLevel number
  The indent level of the group.

• groups IGroup[]
  Stores parent group's children.

• indentWidth number
  Width corresponding to a single level. This is multiplied by the groupLevel to get the full spacer width for the group.

• isCollapsedGroupSelectVisible boolean
  Determines if the group selection check box is shown for collapsed groups.

• isGroupLoading ⁠(group: IGroup) => boolean⁠
  Callback to determine if a group has missing items and needs to load them from the server.

• isSelected boolean
  Deprecated at v.65.1 and will be removed by v 1.0. Use selected instead.

• loadingText string
  Text shown on group headers to indicate the group is being loaded.

• onGroupHeaderClick ⁠(group: IGroup) => void⁠
  Callback for when the group header is clicked.

• onRenderTitle ⁠IRenderFunction<IGroupHeaderProps>⁠
  Override which allows the caller to provider a custom renderer for the GroupHeader title.

• onToggleCollapse ⁠(group: IGroup) => void⁠
  Callback for when the group is expanded or collapsed.

• onToggleSelectGroup ⁠(group: IGroup) => void⁠
  Callback for when the group is selected.

• onToggleSummarize ⁠(group: IGroup) => void⁠
  Callback for when the group "Show All" link is clicked

• selected boolean
  If all items in the group are selected.

• selectionMode SelectionMode
  The selection mode of the list the group lives within.

• showAllLinkText string
  Text to display for the group "Show All" link.

• theme ITheme
  Theme provided by the Higher Order Component

• viewport IViewport
  A reference to the viewport in which the header is rendered.

• className string
  Optional class name to add to the root element.

• compact boolean
  Boolean value to indicate if the component should render in compact mode. Set to false by default

• componentRef ⁠IRefObject<IGroupedList>⁠
  Optional callback to access the IGroupedList interface. Use this instead of ref for accessing the public methods and properties of the component.

• dragDropEvents IDragDropEvents
  Map of callback functions related to drag and drop functionality.

• dragDropHelper IDragDropHelper
  helper to manage drag/drop across item and groups

• eventsToRegister ⁠{ eventName: string; callback: (context: IDragDropContext, event?: any) => void; }[]⁠
  Event names and corresponding callbacks that will be registered to groups and rendered elements

• focusZoneProps IFocusZoneProps
  Optional properties to pass through to the FocusZone.

• getGroupHeight ⁠(group: IGroup, groupIndex: number) => number⁠
  Optional function to override default group height calculation used by list virtualization.

• groupProps IGroupRenderProps
  Optional override properties to render groups.

• groups IGroup[]
  Optional grouping instructions.

• items any[]
  List of items to render.

• listProps IListProps
  Optional properties to pass through to the list components being rendered.

• onGroupExpandStateChanged ⁠(isSomeGroupExpanded: boolean) => void⁠
  Optional callback when the group expand state changes between all collapsed and at least one group is expanded.

• onRenderCell ⁠(nestingDepth?: number, item?: any, index?: number) => React.ReactNode⁠
  Rendering callback to render the group items.

• onShouldVirtualize ⁠(props: IListProps) => boolean⁠
  Optional callback to determine whether the list should be rendered in full, or virtualized. Virtualization will add and remove pages of items as the user scrolls them into the visible range. This benefits larger list scenarios by reducing the DOM on the screen, but can negatively affect performance for smaller lists. The default implementation will virtualize when this callback is not provided.

• selection ISelection
  Optional selection model to track selection state.

• selectionMode SelectionMode
  Controls how/if the list manages selection.

• styles ⁠IStyleFunctionOrObject<IGroupedListStyleProps, IGroupedListStyles>⁠
  Style function to be passed in to override the themed or default styles

• theme ITheme
  Theme that is passed in from Higher Order Component

• usePageCache boolean
  boolean to control if pages containing unchanged items should be cached, this is a perf optimization The same property in List.Props

• viewport IViewport
  Optional Viewport, provided by the parent component.

• styles ⁠IStyleFunctionOrObject<IGroupFooterStyleProps, IGroupFooterStyles>⁠
  Style function to be passed in to override the themed or default styles

• checked boolean
  

• theme ITheme
  

• ariaPosInSet number
  Defines an element's number or position in the current set of listitems or treeitems

• ariaSetSize number
  Defines the number of items in the current set of listitems or treeitems

• expandButtonIcon string
  Defines the name of a custom icon to be used for group headers. If not set, the default icon will be used

• expandButtonProps ⁠React.HTMLAttributes<HTMLButtonElement>⁠
  Native props for the GroupHeader expand and collapse button

• groupedListId string
  GroupedList id for aria-controls

• onRenderGroupHeaderCheckbox ⁠IRenderFunction<IGroupHeaderCheckboxProps>⁠
  If provided, can be used to render a custom checkbox

• selectAllButtonProps ⁠React.HTMLAttributes<HTMLButtonElement>⁠
  Native props for the GroupHeader select all button

• styles ⁠IStyleFunctionOrObject<IGroupHeaderStyleProps, IGroupHeaderStyles>⁠
  Style function to be passed in to override the themed or default styles

• useFastIcons boolean
  Whether to use fast icon and check components. The icons can't be targeted by customization but are still customizable via class names.

• collapseAllVisibility CollapseAllVisibility
  Flag to indicate whether to ignore the collapsing icon on header.

• footerProps IGroupFooterProps
  Information to pass in to the group footer.

• getGroupItemLimit ⁠(group: IGroup) => number⁠
  Grouping item limit.

• headerProps IGroupHeaderProps
  Information to pass in to the group header.

• isAllGroupsCollapsed boolean
  Boolean indicating if all groups are in collapsed state.

• onRenderFooter ⁠IRenderFunction<IGroupFooterProps>⁠
  Override which allows the caller to provide a custom footer.

• onRenderHeader ⁠IRenderFunction<IGroupHeaderProps>⁠
  Override which allows the caller to provide a custom header.

• onRenderShowAll ⁠IRenderFunction<IGroupShowAllProps>⁠
  Override which allows the caller to provide a custom Show All link.

• onToggleCollapseAll ⁠(isAllCollapsed: boolean) => void⁠
  Callback for when all groups are expanded or collapsed.

• role string
  Override which allows the caller to provide a custom aria role

• showAllProps IGroupShowAllProps
  Information to pass in to the group Show all footer.

• showEmptyGroups boolean
  Boolean indicating if empty groups are shown

• showAllLinkText string
  The Show All link text.

• styles ⁠IStyleFunctionOrObject<IGroupShowAllStyleProps, IGroupShowAllStyles>⁠
  Style function to be passed in to override the themed or default styles

• count number
  Count of spacer(s)

• indentWidth number
  How much to indent

• styles ⁠IStyleFunctionOrObject<IGroupSpacerStyleProps, IGroupSpacerStyles>⁠
  Style function to be passed in to override the themed or default styles

• theme ITheme
  Theme from Higher Order Component

Value

Object with shiny.tag class suitable for use in the UI of a Shiny app.

Best practices

FAQ

My List is not re-rendering when I mutate its items. What should I do?

To determine if the list within the grouped list should re-render its contents, the component performs a referential equality check within its shouldComponentUpdate method. This is done to minimize the performance overhead associating with re-rendering the virtualized List pages, as recommended by the React documentation.

As a result of this implementation, the inner list will not determine it should re-render if the array values are mutated. To avoid this problem, we recommend re-creating the items array backing the grouped list by using a method such as Array.prototype.concat or ES6 spread syntax shown below:

public appendItems(): void {
  const { items } = this.state;

  this.setState({
    items: [...items, ...['Foo', 'Bar']]
  })
}

public render(): JSX.Element {
  const { items } = this.state;

  return <GroupedList items={items} />;
}

By re-creating the items array without mutating the values, the inner List will correctly determine its contents have changed and then it should re-render with the new values.

Examples

library(shiny.fluent)

if (interactive()) {
  shinyApp(
    ui = GroupedList(
      items = list("Item A", "Item B", "Item C", "Item D", "Item E"),
      groups = list(
        list(key = "g1", name = "Some items", startIndex = 0, count = 2),
        list(key = "g2", name = "More items", startIndex = 2, count = 3)
      ),
      selectionMode = 0,
      onRenderCell = JS("(depth, item) => (
        jsmodule['react'].createElement('span', { style: { paddingLeft: 49 } }, item)
      )")
    ),
    server = function(input, output) {}
  )
}