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

• Scrolling
• pager

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

The following scrolling modes are available:

• Standard
  A user scrolls a single page only. Scrolling is available only if all the page's rows do not fit into the UI component's height. In this mode, the pager performs the main navigation and scrolling is auxiliary. If paging is disabled, the UI component loads all rows simultaneously which can reduce the UI component's performance. In this case, we recommend that you use another scrolling mode.

• Virtual
  Rows are loaded when they get into the viewport and removed once they leave it. If the rows take time to be loaded and rendered, they display gray boxes. Rendering optimization can reduce rendering time and remove gray boxes. In this mode, users can move to any page instantly.

• Infinite
  Each next page is loaded once the scrollbar reaches the end of its scale. In this mode, users scroll data gradually from the first to the last page. Row selection in infinite and virtual scroll mode with Shift+Click does not work in the following cases:

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

  Set the grouping.allowCollapsing property to false when using infinite scrolling in conjunction with grouping.

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

• Scrolling

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.

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. Rows that are being currently rendered can be shown as grey boxes.

View Demo

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.

By default, the UI component employs native scrolling on most platforms, except non-Mac desktops and devices based on Android older than version 4. To employ native scrolling on all platforms without exception, assign true to this property. If you assign false, the UI component simulates scrolling on all platforms.