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Sep 13, 2021
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kb(scheduler): load on demand #486

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30 changes: 30 additions & 0 deletions knowledge-base/scheduler-load-on-demand.md
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---
title: Scheduler backend filtering
description: How to load scheduler events (appointments) on demand from the backend page by page?
type: how-to
page_title: Load Scheduler appointments on demand
slug: scheduler-kb-lod-server
position:
tags:
ticketid: 1531423
res_type: kb
---

## Environment
<table>
<tbody>
<tr>
<td>Product</td>
<td>Scheduler for Blazor</td>
</tr>
</tbody>
</table>


## Description
How do I "page" the scheduler data? I want to load on demand only the currently visible appointments in the view from the backend to improve performance.

## Solution
You can use the events the component provides to pass the current view and date to the data service so it can implement a high performant query to return only the necessary items, instead of returning all available appointments.

You can find an example in the following sample project: [Scheduler - Load Appointments On Demand](https://github.com/telerik/blazor-ui/tree/master/scheduler/load-appointments-on-demand)