Angular DataGrid - scrolling

Configures scrolling.

Selector: dxo-scrolling
Type:

Scrolling

Scrolling allows a user to browse data left outside the current viewport. The UI component provides several scrolling modes detailed in the mode property description.

Virtual Scrolling Demo Infinite Scrolling Demo

See Also

columnRenderingMode

Specifies the rendering mode for columns. Applies when columns are left outside the viewport. Requires the columnWidth, columnAutoWidth, or width (for all columns) property specified.

Type:

DataRenderMode

Default Value: 'standard'

The following rendering modes are available in the UI component:

  • "standard"
    Renders all columns at once.

  • "virtual"
    Renders only those columns that get into the viewport.

View Demo

mode

Specifies the scrolling mode.

Type:

DataGridScrollMode

Default Value: 'standard'

If you change this property, the DataGrid reloads.

The following scrolling modes are available:

  • Standard
    A user scrolls a single page only. Scrolling is available only if all rows of a page do not fit within the UI component's height. In this mode, the pager performs the main navigation and scrolling is auxiliary. If you disable the paging feature, the UI component loads all rows simultaneously. This action can reduce the UI component's performance. In this case, use another scrolling mode.

  • Virtual
    The component loads pages while they are visible within the viewport and removes them once they leave it. In this mode, users can move to any page instantly. If the component takes time to load and render rows, they display gray boxes. Rendering optimization can reduce render time and remove the gray boxes.

  • Infinite
    The component loads the next page once the scrollbar reaches the end of its scale. In this mode, users scroll data gradually from the first to the last page.

NOTE

  • Set the grouping.allowCollapsing property to false when you use infinite scrolling in conjunction with grouping.

  • Specify the component's height if you use virtual or infinite scrolling.

  • Set editing.refreshMode to repaint to support editing if you use infinite scrolling.

  • Row selection in infinite and virtual scroll mode with Shift+Click does not work in the following cases:

    • Deferred selection is enabled.
    • Row grouping is enabled.
    • The allowSelectAll property is set to false.

Note that the rowRenderingMode property value is "virtual" and cannot be changed if you set the mode property to "virtual" or "infinite".

Regardless of the scrolling mode, you can use the paging.pageSize property to specify the number of rows on a page.

Virtual Scrolling Demo Infinite Scrolling Demo

See Also

preloadEnabled

Specifies whether the UI component should load adjacent pages. Applies only if scrolling.mode is "virtual" or "infinite".

Type:

Boolean

Default Value: false

In virtual and infinite scrolling modes, pages are loaded on demand. If you set this property to true, the adjacent pages are loaded in advance for smoother scrolling. This property can reduce the performance on older devices.

renderAsync

Specifies whether to render rows after a user stops scrolling or at the same time as the user scrolls the DataGrid.

Type:

Boolean

| undefined
Default Value: undefined

This property can have one of the following values:

scrolling.renderAsync Description
true Rows are rendered after a user stops scrolling.
In this mode, row content may take time to appear, but scrolling is smoother.
false Rows are rendered at the same time as the user scrolls the DataGrid.
In this mode, row content is displayed quicker, but the component performance during scrolling may be lowered.
undefined The mode is defined automatically based on the row content.

rowRenderingMode

Specifies the rendering mode for loaded rows.

Type:

DataRenderMode

Default Value: 'standard'

Unlike the mode property, which defines when to load data for rows, this property defines when to render them. The following rendering modes are available:

  • "standard"
    Renders all the loaded rows at once.

  • "virtual"
    Renders only those rows that get into the viewport. Use this mode if the pageSize is large. Specify the component's height and height of its container if you use the virtual mode.

NOTE
The rowRenderingMode property value is "virtual" and cannot be changed if you set the scrolling.mode property to "virtual" or "infinite".

View Demo

scrollByContent

Specifies whether a user can scroll the content with a swipe gesture. Applies only if useNative is false.

Type:

Boolean

Default Value: true, false (non-touch devices)

scrollByThumb

Specifies whether a user can scroll the content with the scrollbar. Applies only if useNative is false.

Type:

Boolean

Default Value: false

showScrollbar

Specifies when to show scrollbars. Applies only if useNative is false.

Type:

ScrollbarMode

Default Value: 'onScroll', 'onHover' (desktop)

The scrollbars help to scroll the content vertically and horizontally. Vertical scrolling is available when all the rows do not fit in the UI component's height. Horizontal scrolling is available when all the columns do not fit in the UI component's width, which can happen when columns have fixed widths or the columnAutoWidth property is set to true.

useNative

Specifies whether the DataGrid should use native or simulated scrolling.

Type:

Boolean

|

Mode

Default Value: 'auto'

This property can have one of the following values:

scrolling.useNative Description
"auto" Native scrolling on all platforms, except non-Mac desktops.
true Native scrolling on all platforms, without exceptions.
false Simulated scrolling on all platforms.