OBOUT - ASP.NET ListBox - Virtual Scrolling

ASP.NET ListBox - Virtual Scrolling

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The items of the ListBox can be loaded on-demand (via AJAX requests). The advantage of using this approach
is that the items are loaded asynchronously. Thus, the page will load very fast because no item is loaded on page load.

In order to enable the on demand loading feature, set the EnableLoadOnDemand property to true.
You also need to handle the LoadingItems server-side event, which is executed each time the ListBox
requests items from the server via AJAX.

To improve the performance even further, you can use the "paging" approach for the load on demand feature. Using this approach will force the ListBox to load only a limited number at a time, instead of retrieving all the matches at once. So for example, if there are 10,000 items in the database, you can configure the ListBox to load 100 items at a time, to make the on demand loading functionality run smoother.

To load the next set of items, the end user simply needs to click on the footer text from the bottom of the list with items.

Additionally you can enable the virtual scrolling feature, which will allow end users to load new sets of items simply by scrolling the list of items (or by using the mouse wheel). To enable the virtual scrolling feature, simply set the EnableVirtualScrolling property to true.