JavaScript/jQuery Scheduler - Optimize Scheduler Performance with Lazy Loading

If the performance of a Scheduler component suffers due to a high number of appointments, you can lazy load the data as necessary.

1. Modify your back-end API to accept queries with time limit parameters. For example, the query appointments?startDate=01-01-2024&endDate=01-07-2024 should only return events within the specified time window.

2. Create a customStore that can pass extra arguments to your back-end code.

   const myCustomStore = new CustomStore({
       key: 'id',
       async load(loadOptions) => {
           const startDate = loadOptions.startDate;
           const endDate = loadOptions.endDate;
           try {
               const response = await fetch(`https://my-server.com/api/appointments?startDate={startDate}&endDate={endDate}`);
               const result = await response.json();
                   return {
                       data: result.data;
                   }
           } catch (err) {
               throw new Error('Data Loading Error');
           }
       }
   });

3. To indicate that your back-end server is now responsible for filtering, set the remoteFiltering Scheduler option to true.

   jQuery

   index.js

   $("#schedulerContainer").dxScheduler({
       dataSource: myCustomStore,
       remoteFiltering: true
       ...
   });

   Angular

   app.component.html

   <dx-scheduler
       [dataSource]="myCustomStore"
       [remoteFiltering]="true"
       ...>
   </dx-scheduler>

   Vue

   App.vue

   <DxScheduler
       :data-source="myCustomStore"
       :remote-filtering="true"
       ...
   />

   React

   App.js

   <Scheduler
       dataSource={myCustomStore}
       remoteFiltering={true}
       ...
   />