Virtual scrolling provides an alternative to paging and is useful for displaying large sets of data.
The virtualization functionality uses a fixed amount of list items in the pop-up list of the component. While the user is scrolling the pop-up list, the MultiSelect requests and displays only the visible items.
To enable virtualization, configure the
onPageChange event and the composite
virtual property which contains the following fields:
total—Represents the number of records.
skip—Represents the start of the sub-set of data which is loaded in the MultiSelect.
pageSize—Indicates the size of the sub-set of data.
onPageChange—Provides the data for each page through the
- In order for the virtualization to work properly, the items in the popup list must have the same height. If the content of an item does not fit in a single row, the height of this item will be different from the height of the other items.
- You also need to make sure that the
pageSizevalue is at least equal to the number of the visible pop-up items plus two.
The following example demonstrates how to set the virtualization of the MultiSelect.
Virtualization with Filtering
If you use virtualization in your project alongside filtering, scrolling will be reset every time the value of the filter input is changed.
Virtualization with Grouping
The below example shows how we can use the MultiSelect in a scenario with Grouping and Virtualization.