Components / Grid / Scroll Modes

Virtual Scrolling

Virtual scrolling provides an alternative to paging.

While the user is scrolling the table, the Grid requests and displays only the visible pages. To define the virtual scrolling functionality, set scrollable to virtual.

Generally, to determine when a pageChange event has to be fired so that the Grid obtains and displays the next or the previous portion (page) of data items, the virtual scrolling functionality of the Grid relies on calculations that are based on the fixed and equal rowHeight of the rows, the set pageSize of the Grid, and the scrollTop position of the scrollable data table container. In master-detail scenarios, you have to predefine both rowHeight and detailRowHeight to ensure the proper functioning of the data virtualization, loading, and rendering of the correct items.

Getting Started

To configure the Grid for virtual scrolling:

  1. Set its height either through its height input or through the style property.
  2. Set the regular or detail row height and the number of records.
  3. Provide the data for each page through the pageChange event handler.

To work properly, virtual scrolling requires you to set the following configuration options:

  • (Required) scrollable—Set it to virtual.
  • (Required) height
  • (Required) rowHeight
  • (Required) skip
  • (Required) pageSize—To avoid unexpected behavior during scrolling, set pageSize to at least three times the number of the visible Grid elements. The number of the visible Grid elements is determined by the height and rowHeight settings of the Grid.
  • (Required) data—Instruct the data option to use GridDataResult with the configured total field.
  • (Optional) detailRowHeight—Set the detailRowHeight option only when you use detail rows.

The following example demonstrates how to use virtual scrolling with local data.

import { Component, ViewEncapsulation } from '@angular/core';
import { GridDataResult, PageChangeEvent } from '@progress/kendo-angular-grid';

@Component({
    selector: 'my-app',
    /*
     * Set a fixed row height of 36px (20px line height, 2 * 8px padding)
     *
     * [row height] = [line height] + [padding] + [border]
     *
     * Note: If using the Kendo UI Material theme, add 1px to the row height
     * to account for the bottom border width.
     */
    encapsulation: ViewEncapsulation.None,
    styles: [`
        .k-grid tbody td {
            white-space: nowrap;
            line-height: 20px;
            padding: 8px 12px;
        }
    `],
    template: `
      <kendo-grid
          [data]="gridView"
          [skip]="skip"
          [pageSize]="pageSize"
          scrollable="virtual"
          [rowHeight]="36"
          [height]="450"
          (pageChange)="pageChange($event)"
          [navigable]="true"
        >
        <kendo-grid-column field="id" [width]="80" title="ID"></kendo-grid-column>
        <kendo-grid-column field="firstName" title="First Name" [width]="130"></kendo-grid-column>
        <kendo-grid-column field="lastName" title="Last Name" [width]="130"></kendo-grid-column>
        <kendo-grid-column field="city" title="City" [width]="130"></kendo-grid-column>
        <kendo-grid-column field="title" title="Title" [width]="180"></kendo-grid-column>
      </kendo-grid>
  `
})
export class AppComponent {
    public gridView: GridDataResult;
    public data: any[];
    public pageSize = 100;
    public skip = 0;

    constructor() {
        this.data = this.createRandomData(100000);
        this.loadProducts();
    }

    public pageChange(event: PageChangeEvent): void {
        this.skip = event.skip;
        this.loadProducts();
    }

    private loadProducts(): void {
        this.gridView = {
            data: this.data.slice(this.skip, this.skip + this.pageSize),
            total: this.data.length
        };
    }

    /* Generating example data */
    private createRandomData(count: number): any[] {
        const firstNames = ['Nancy', 'Andrew', 'Janet', 'Margaret', 'Steven', 'Michael', 'Robert', 'Laura', 'Anne', 'Nige'],
            lastNames = ['Davolio', 'Fuller', 'Leverling', 'Peacock', 'Buchanan', 'Suyama', 'King', 'Callahan', 'Dodsworth', 'White'],
            cities = ['Seattle', 'Tacoma', 'Kirkland', 'Redmond', 'London', 'Philadelphia', 'New York', 'Seattle', 'London', 'Boston'],
            titles = ['Accountant', 'Vice President, Sales', 'Sales Representative', 'Technical Support', 'Sales Manager', 'Web Designer',
                'Software Developer'];

        return Array(count).fill({}).map((_, idx) => ({
            id: idx + 1,
            firstName: firstNames[Math.floor(Math.random() * firstNames.length)],
            lastName: lastNames[Math.floor(Math.random() * lastNames.length)],
            city: cities[Math.floor(Math.random() * cities.length)],
            title: titles[Math.floor(Math.random() * titles.length)]
        })
        );
    }
}

import { NgModule } from '@angular/core';
import { BrowserModule } from '@angular/platform-browser';
import { BrowserAnimationsModule } from '@angular/platform-browser/animations';
import { FormsModule } from '@angular/forms';
import { GridModule } from '@progress/kendo-angular-grid';

import { AppComponent } from './app.component';

@NgModule({
  imports: [ BrowserModule, BrowserAnimationsModule, FormsModule, GridModule ],
  declarations: [ AppComponent ],
  bootstrap: [ AppComponent ]
})

export class AppModule { }

import { enableProdMode } from '@angular/core';
import { platformBrowserDynamic } from '@angular/platform-browser-dynamic';
import { AppModule } from './app.module';

enableProdMode();

const platform = platformBrowserDynamic();
platform.bootstrapModule(AppModule);

The following example demonstrates how to use virtual scrolling with remote data.

import {
    Component,
    ViewEncapsulation
} from '@angular/core';

import { tap } from 'rxjs/operators/tap';
import { switchMap } from 'rxjs/operators/switchMap';
import { BehaviorSubject } from 'rxjs/BehaviorSubject';

import { OrdersService } from './northwind.service';

@Component({
    selector: 'my-app',
    providers: [OrdersService],
    /*
     * Set a fixed row height of 36px (20px line height, 2 * 8px padding)
     *
     * [row height] = [line height] + [padding] + [border]
     *
     * Note: If using the Kendo UI Material theme, add 1px to the row height
     * to account for the bottom border width.
     */
    encapsulation: ViewEncapsulation.None,
    styles: [`
        .k-grid tbody td {
            white-space: nowrap;
            line-height: 20px;
            padding: 8px 12px;
        }
    `],
    template: `
      <kendo-grid
          [data]="query | async"
          [loading]="loading"
          [skip]="state.skip"
          [pageSize]="state.take"
          scrollable="virtual"
          [rowHeight]="36"
          [height]="450"
          (pageChange)="pageChange($event)"
        >
        <kendo-grid-column field="OrderID" [width]="80" title="ID"></kendo-grid-column>
        <kendo-grid-column field="ShipName" title="Ship Name" [width]="200"></kendo-grid-column>
        <kendo-grid-column field="ShipAddress" title="Ship Address" [width]="200"></kendo-grid-column>
        <kendo-grid-column field="ShipCity" title="Ship City" [width]="100"></kendo-grid-column>
        <kendo-grid-column field="ShipCountry" title="Ship Country" [width]="100"></kendo-grid-column>
      </kendo-grid>
  `
})
export class AppComponent {
    public loading: boolean;

    public state: any = {
        skip: 0,
        take: 100
    };

    public query: any;
    private stateChange = new BehaviorSubject<any>(this.state);

    constructor(private service: OrdersService) {

        this.query = this.stateChange.pipe(
            tap(state => {
                this.state = state;
                this.loading = true;
            }),
            switchMap(state => service.fetch(state)),
            tap(() => {
                this.loading = false;
            })
        );
    }

    public pageChange(state: any): void {
        this.stateChange.next(state);
    }
}

import { Injectable } from '@angular/core';
import { HttpClient } from '@angular/common/http';
import { toODataString } from '@progress/kendo-data-query';
import { Observable } from 'rxjs/Observable';
import { BehaviorSubject } from 'rxjs/BehaviorSubject';
import { map } from 'rxjs/operators/map';

export abstract class NorthwindService {
    private BASE_URL = 'https://odatasampleservices.azurewebsites.net/V4/Northwind/Northwind.svc/';

    constructor(
        private http: HttpClient,
        protected tableName: string
    ) {
    }

    public fetch(state: any): Observable<GridDataResult> {
        const queryStr = `${toODataString(state)}&$count=true`;

        return this.http
            .get(`${this.BASE_URL}${this.tableName}?${queryStr}`)
            .pipe(
                map(response => (<GridDataResult>{
                    data: response['value'],
                    total: parseInt(response['@odata.count'], 10)
                }))
            );
    }
}

@Injectable()
export class OrdersService extends NorthwindService {
    constructor(http: HttpClient) { super(http, 'Orders'); }
}

import { NgModule } from '@angular/core';
import { BrowserModule } from '@angular/platform-browser';
import { BrowserAnimationsModule } from '@angular/platform-browser/animations';
import { FormsModule } from '@angular/forms';
import { HttpClientModule } from '@angular/common/http';
import { GridModule } from '@progress/kendo-angular-grid';

import { AppComponent } from './app.component';

@NgModule({
  imports: [ BrowserModule, BrowserAnimationsModule, FormsModule, GridModule, HttpClientModule ],
  declarations: [ AppComponent ],
  bootstrap: [ AppComponent ]
})

export class AppModule { }

import { enableProdMode } from '@angular/core';
import { platformBrowserDynamic } from '@angular/platform-browser-dynamic';
import { AppModule } from './app.module';

enableProdMode();

const platform = platformBrowserDynamic();
platform.bootstrapModule(AppModule);

Using Virtualization with Grouping

You can use virtual scrolling in combination with grouped data by utilizing the kendoGridGroupBinding directive. The directive supports only the processing of in-memory data and you have to provide the full set of data that will be processed.

import { Component, ViewEncapsulation } from '@angular/core';
import { GridDataResult, PageChangeEvent } from '@progress/kendo-angular-grid';

@Component({
    selector: 'my-app',
    /*
     * Set a fixed row height of 36px (20px line height, 2 * 8px padding)
     *
     * [row height] = [line height] + [padding] + [border]
     *
     * Note: If using the Kendo UI Material theme, add 1px to the row height
     * to account for the bottom border width.
     */
    encapsulation: ViewEncapsulation.None,
    styles: [`
        .k-grid tbody td {
            white-space: nowrap;
            line-height: 20px;
            padding: 8px 12px;
        }
    `],
    template: `
      <kendo-grid
          [kendoGridGroupBinding]="data"
          [navigable]="true"
          [groupable]="true"
          [sortable]="true"
          [pageSize]="80"
          scrollable="virtual"
          [rowHeight]="36"
          [height]="450"
        >
        <kendo-grid-column field="id" [width]="80" title="ID"></kendo-grid-column>
        <kendo-grid-column field="firstName" title="First Name" [width]="130"></kendo-grid-column>
        <kendo-grid-column field="lastName" title="Last Name" [width]="130"></kendo-grid-column>
        <kendo-grid-column field="city" title="City" [width]="130"></kendo-grid-column>
        <kendo-grid-column field="title" title="Title" [width]="180"></kendo-grid-column>
      </kendo-grid>
  `
})
export class AppComponent {
    public data: any[] = [];

    constructor() {
        this.data = this.createRandomData(100000);
    }

    /* Generating example data */
    private createRandomData(count: number): any[] {
        const firstNames = ['Nancy', 'Andrew', 'Janet', 'Margaret', 'Steven', 'Michael', 'Robert', 'Laura', 'Anne', 'Nige'],
            lastNames = ['Davolio', 'Fuller', 'Leverling', 'Peacock', 'Buchanan', 'Suyama', 'King', 'Callahan', 'Dodsworth', 'White'],
            cities = ['Seattle', 'Tacoma', 'Kirkland', 'Redmond', 'London', 'Philadelphia', 'New York', 'Seattle', 'London', 'Boston'],
            titles = ['Accountant', 'Vice President, Sales', 'Sales Representative', 'Technical Support', 'Sales Manager', 'Web Designer',
                'Software Developer'];

        return Array(count).fill({}).map((_, idx) => ({
            id: idx + 1,
            firstName: firstNames[Math.floor(Math.random() * firstNames.length)],
            lastName: lastNames[Math.floor(Math.random() * lastNames.length)],
            city: cities[Math.floor(Math.random() * cities.length)],
            title: titles[Math.floor(Math.random() * titles.length)]
        })
        );
    }
}

import { NgModule } from '@angular/core';
import { BrowserModule } from '@angular/platform-browser';
import { BrowserAnimationsModule } from '@angular/platform-browser/animations';
import { FormsModule } from '@angular/forms';
import { GridModule } from '@progress/kendo-angular-grid';

import { AppComponent } from './app.component';

@NgModule({
  imports: [ BrowserModule, BrowserAnimationsModule, FormsModule, GridModule ],
  declarations: [ AppComponent ],
  bootstrap: [ AppComponent ]
})

export class AppModule { }

import { enableProdMode } from '@angular/core';
import { platformBrowserDynamic } from '@angular/platform-browser-dynamic';
import { AppModule } from './app.module';

enableProdMode();

const platform = platformBrowserDynamic();
platform.bootstrapModule(AppModule);

Using Virtualization with Responsive Columns

The virtual scrolling functionality requires that all Grid rows have an equal, predefined height. However, you can still keep virtual scrolling and use responsive columns which have different cell templates based on the column width.

import {
    AfterViewInit,
    Component,
    Renderer2,
    ViewChild,
    ViewEncapsulation
} from '@angular/core';

import {
    GridComponent,
    GridDataResult,
    PageChangeEvent
} from '@progress/kendo-angular-grid';

import { debounceTime } from 'rxjs/operators';

@Component({
    selector: 'my-app',
    /*
     * Set a fixed row height of 36px (20px line height, 2 * 8px padding)
     *
     * [row height] = [line height] + [padding] + [border]
     *
     * Note: If using the Kendo UI Material theme, add 1px to the row height
     * to account for the bottom border width.
     */
    encapsulation: ViewEncapsulation.None,
    styles: [`
        .k-grid tbody td {
            white-space: nowrap;
            line-height: 20px;
            padding: 8px 12px;
        }
    `],
    template: `
      <kendo-grid #grid
          [data]="gridView"
          [skip]="skip"
          [pageSize]="pageSize"
          scrollable="virtual"
          [rowHeight]="rowHeight"
          [height]="350"
        >
        <kendo-grid-column media="xs" title="Items">
            <ng-template kendoGridCellTemplate let-dataItem>
              <div class="mobile-row">
                <!-- template for mobile -->
                <h4 [class.discontinued]="dataItem.Discontinued">
                    {{ dataItem.firstName }} {{ dataItem.lastName }}
                </h4>
                <dl>
                    <dt>City</dt>
                    <dd>{{ dataItem.city }}</dd>

                    <dt>ID</dt>
                    <dd>{{ dataItem.id }}</dd>
                </dl>
              </div>
            </ng-template>
        </kendo-grid-column>

        <kendo-grid-column media="sm" field="id" [width]="80" title="ID"></kendo-grid-column>
        <kendo-grid-column media="sm" field="firstName" title="First Name" [width]="130"></kendo-grid-column>
        <kendo-grid-column media="sm" field="lastName" title="Last Name" [width]="130"></kendo-grid-column>
        <kendo-grid-column media="sm" field="city" title="City" [width]="130"></kendo-grid-column>
        <kendo-grid-column media="sm" field="title" title="Title" [width]="180"></kendo-grid-column>
      </kendo-grid>
  `,
  styles: [
    `
        dl { margin: 0; }
        .mobile-row { height: 140px; overflow: hidden; }

    `
  ]
})
export class AppComponent implements AfterViewInit {
    private gridView: GridDataResult;
    private data: any[];
    private pageSize = 100;
    private skip = 0;

    private rowHeight = 36;

    @ViewChild('grid')
    private grid: GridComponent;

    constructor(private renderer: Renderer2) {
        this.data = this.createRandomData(100000);
        this.loadProducts();

        this.updateRowHeight();
        renderer.listen('window', 'resize', () => this.updateRowHeight());
    }

    ngAfterViewInit(): void {
        this.grid.pageChange.pipe(debounceTime(50))
            .subscribe((e) => this.pageChange(e));
    }

    public updateRowHeight(): void {
      // change row height for given media
      // XS responsive brakpoint as defined in http://www.telerik.com/kendo-angular-ui/components/grid/responsive/
      this.rowHeight = window.matchMedia("(max-width: 576px)").matches ? 156 : 36;
      console.log('rowHeight is now ', this.rowHeight);
    }

    protected pageChange(event: PageChangeEvent): void {
        this.skip = event.skip;
        this.loadProducts();
    }

    private loadProducts(): void {
        this.gridView = {
            data: this.data.slice(this.skip, this.skip + this.pageSize),
            total: this.data.length
        };
    }

    /* Generating example data */
    private createRandomData(count: number) {
        const firstNames = ["Nancy", "Andrew", "Janet", "Margaret", "Steven", "Michael", "Robert", "Laura", "Anne", "Nige"],
            lastNames = ["Davolio", "Fuller", "Leverling", "Peacock", "Buchanan", "Suyama", "King", "Callahan", "Dodsworth", "White"],
            cities = ["Seattle", "Tacoma", "Kirkland", "Redmond", "London", "Philadelphia", "New York", "Seattle", "London", "Boston"],
            titles = ["Accountant", "Vice President, Sales", "Sales Representative", "Technical Support", "Sales Manager", "Web Designer",
                "Software Developer"];

        return Array(count).fill({}).map((_, idx) => ({
            id: idx + 1,
            firstName: firstNames[Math.floor(Math.random() * firstNames.length)],
            lastName: lastNames[Math.floor(Math.random() * lastNames.length)],
            city: cities[Math.floor(Math.random() * cities.length)],
            title: titles[Math.floor(Math.random() * titles.length)]
        })
        );
    }
}

import { NgModule } from '@angular/core';
import { BrowserModule } from '@angular/platform-browser';
import { BrowserAnimationsModule } from '@angular/platform-browser/animations';
import { GridModule } from '@progress/kendo-angular-grid';

import { AppComponent } from './app.component';

@NgModule({
  imports:      [ BrowserModule, BrowserAnimationsModule, GridModule ],
  declarations: [ AppComponent ],
  bootstrap:    [ AppComponent ]
})

export class AppModule { }

export const sampleProducts = [
    {
        "ProductID": 1,
        "ProductName": "Chai",
        "SupplierID": 1,
        "CategoryID": 1,
        "QuantityPerUnit": "10 boxes x 20 bags",
        "UnitPrice": 18,
        "UnitsInStock": 39,
        "UnitsOnOrder": 0,
        "ReorderLevel": 10,
        "Discontinued": false,
        "Category": {
            "CategoryID": 1,
            "CategoryName": "Beverages",
            "Description": "Soft drinks, coffees, teas, beers, and ales"
        },
        "FirstOrderedOn": new Date(1996, 8, 20)
    },
    {
        "ProductID": 2,
        "ProductName": "Chang",
        "SupplierID": 1,
        "CategoryID": 1,
        "QuantityPerUnit": "24 - 12 oz bottles",
        "UnitPrice": 19,
        "UnitsInStock": 17,
        "UnitsOnOrder": 40,
        "ReorderLevel": 25,
        "Discontinued": false,
        "Category": {
            "CategoryID": 1,
            "CategoryName": "Beverages",
            "Description": "Soft drinks, coffees, teas, beers, and ales"
        },
        "FirstOrderedOn": new Date(1996, 7, 12)
    },
    {
        "ProductID": 3,
        "ProductName": "Aniseed Syrup",
        "SupplierID": 1,
        "CategoryID": 2,
        "QuantityPerUnit": "12 - 550 ml bottles",
        "UnitPrice": 10,
        "UnitsInStock": 13,
        "UnitsOnOrder": 70,
        "ReorderLevel": 25,
        "Discontinued": false,
        "Category": {
            "CategoryID": 2,
            "CategoryName": "Condiments",
            "Description": "Sweet and savory sauces, relishes, spreads, and seasonings"
        },
        "FirstOrderedOn": new Date(1996, 8, 26)
    },
    {
        "ProductID": 4,
        "ProductName": "Chef Anton's Cajun Seasoning",
        "SupplierID": 2,
        "CategoryID": 2,
        "QuantityPerUnit": "48 - 6 oz jars",
        "UnitPrice": 22,
        "UnitsInStock": 53,
        "UnitsOnOrder": 0,
        "ReorderLevel": 0,
        "Discontinued": false,
        "Category": {
            "CategoryID": 2,
            "CategoryName": "Condiments",
            "Description": "Sweet and savory sauces, relishes, spreads, and seasonings"
        },
        "FirstOrderedOn": new Date(1996, 9, 19)
    },
    {
        "ProductID": 5,
        "ProductName": "Chef Anton's Gumbo Mix",
        "SupplierID": 2,
        "CategoryID": 2,
        "QuantityPerUnit": "36 boxes",
        "UnitPrice": 21.35,
        "UnitsInStock": 0,
        "UnitsOnOrder": 0,
        "ReorderLevel": 0,
        "Discontinued": true,
        "Category": {
            "CategoryID": 2,
            "CategoryName": "Condiments",
            "Description": "Sweet and savory sauces, relishes, spreads, and seasonings"
        },
        "FirstOrderedOn": new Date(1996, 7, 17)
    },
    {
        "ProductID": 6,
        "ProductName": "Grandma's Boysenberry Spread",
        "SupplierID": 3,
        "CategoryID": 2,
        "QuantityPerUnit": "12 - 8 oz jars",
        "UnitPrice": 25,
        "UnitsInStock": 120,
        "UnitsOnOrder": 0,
        "ReorderLevel": 25,
        "Discontinued": false,
        "Category": {
            "CategoryID": 2,
            "CategoryName": "Condiments",
            "Description": "Sweet and savory sauces, relishes, spreads, and seasonings"
        },
        "FirstOrderedOn": new Date(1996, 9, 19)
    },
    {
        "ProductID": 7,
        "ProductName": "Uncle Bob's Organic Dried Pears",
        "SupplierID": 3,
        "CategoryID": 7,
        "QuantityPerUnit": "12 - 1 lb pkgs.",
        "UnitPrice": 30,
        "UnitsInStock": 15,
        "UnitsOnOrder": 0,
        "ReorderLevel": 10,
        "Discontinued": false,
        "Category": {
            "CategoryID": 7,
            "CategoryName": "Produce",
            "Description": "Dried fruit and bean curd"
        },
        "FirstOrderedOn": new Date(1996, 7, 22)
    },
    {
        "ProductID": 8,
        "ProductName": "Northwoods Cranberry Sauce",
        "SupplierID": 3,
        "CategoryID": 2,
        "QuantityPerUnit": "12 - 12 oz jars",
        "UnitPrice": 40,
        "UnitsInStock": 6,
        "UnitsOnOrder": 0,
        "ReorderLevel": 0,
        "Discontinued": false,
        "Category": {
            "CategoryID": 2,
            "CategoryName": "Condiments",
            "Description": "Sweet and savory sauces, relishes, spreads, and seasonings"
        },
        "FirstOrderedOn": new Date(1996, 11, 1)
    },
    {
        "ProductID": 9,
        "ProductName": "Mishi Kobe Niku",
        "SupplierID": 4,
        "CategoryID": 6,
        "QuantityPerUnit": "18 - 500 g pkgs.",
        "UnitPrice": 97,
        "UnitsInStock": 29,
        "UnitsOnOrder": 0,
        "ReorderLevel": 0,
        "Discontinued": true,
        "Category": {
            "CategoryID": 6,
            "CategoryName": "Meat/Poultry",
            "Description": "Prepared meats"
        },
        "FirstOrderedOn": new Date(1997, 1, 21)
    },
    {
        "ProductID": 10,
        "ProductName": "Ikura",
        "SupplierID": 4,
        "CategoryID": 8,
        "QuantityPerUnit": "12 - 200 ml jars",
        "UnitPrice": 31,
        "UnitsInStock": 31,
        "UnitsOnOrder": 0,
        "ReorderLevel": 0,
        "Discontinued": false,
        "Category": {
            "CategoryID": 8,
            "CategoryName": "Seafood",
            "Description": "Seaweed and fish"
        },
        "FirstOrderedOn": new Date(1996, 8, 5)
    }
];

export const products = [{
    "ProductID": 1,
    "ProductName": "Chai",
    "SupplierID": 1,
    "CategoryID": 1,
    "QuantityPerUnit": "10 boxes x 20 bags",
    "UnitPrice": 18.0000,
    "UnitsInStock": 39,
    "UnitsOnOrder": 0,
    "ReorderLevel": 10,
    "Discontinued": false,
    "Category": {
        "CategoryID": 1,
        "CategoryName": "Beverages",
        "Description": "Soft drinks, coffees, teas, beers, and ales"
    }
}, {
    "ProductID": 2,
    "ProductName": "Chang",
    "SupplierID": 1,
    "CategoryID": 1,
    "QuantityPerUnit": "24 - 12 oz bottles",
    "UnitPrice": 19.0000,
    "UnitsInStock": 17,
    "UnitsOnOrder": 40,
    "ReorderLevel": 25,
    "Discontinued": false,
    "Category": {
        "CategoryID": 1,
        "CategoryName": "Beverages",
        "Description": "Soft drinks, coffees, teas, beers, and ales"
    }
}, {
    "ProductID": 3,
    "ProductName": "Aniseed Syrup",
    "SupplierID": 1,
    "CategoryID": 2,
    "QuantityPerUnit": "12 - 550 ml bottles",
    "UnitPrice": 10.0000,
    "UnitsInStock": 13,
    "UnitsOnOrder": 70,
    "ReorderLevel": 25,
    "Discontinued": false,
    "Category": {
        "CategoryID": 2,
        "CategoryName": "Condiments",
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        "CategoryName": "Meat/Poultry",
        "Description": "Prepared meats"
    }
}, {
    "ProductID": 54,
    "ProductName": "Tourtière",
    "SupplierID": 25,
    "CategoryID": 6,
    "QuantityPerUnit": "16 pies",
    "UnitPrice": 7.4500,
    "UnitsInStock": 21,
    "UnitsOnOrder": 0,
    "ReorderLevel": 10,
    "Discontinued": false,
    "Category": {
        "CategoryID": 6,
        "CategoryName": "Meat/Poultry",
        "Description": "Prepared meats"
    }
}, {
    "ProductID": 55,
    "ProductName": "Pâté chinois",
    "SupplierID": 25,
    "CategoryID": 6,
    "QuantityPerUnit": "24 boxes x 2 pies",
    "UnitPrice": 24.0000,
    "UnitsInStock": 115,
    "UnitsOnOrder": 0,
    "ReorderLevel": 20,
    "Discontinued": false,
    "Category": {
        "CategoryID": 6,
        "CategoryName": "Meat/Poultry",
        "Description": "Prepared meats"
    }
}, {
    "ProductID": 56,
    "ProductName": "Gnocchi di nonna Alice",
    "SupplierID": 26,
    "CategoryID": 5,
    "QuantityPerUnit": "24 - 250 g pkgs.",
    "UnitPrice": 38.0000,
    "UnitsInStock": 21,
    "UnitsOnOrder": 10,
    "ReorderLevel": 30,
    "Discontinued": false,
    "Category": {
        "CategoryID": 5,
        "CategoryName": "Grains/Cereals",
        "Description": "Breads, crackers, pasta, and cereal"
    }
}, {
    "ProductID": 57,
    "ProductName": "Ravioli Angelo",
    "SupplierID": 26,
    "CategoryID": 5,
    "QuantityPerUnit": "24 - 250 g pkgs.",
    "UnitPrice": 19.5000,
    "UnitsInStock": 36,
    "UnitsOnOrder": 0,
    "ReorderLevel": 20,
    "Discontinued": false,
    "Category": {
        "CategoryID": 5,
        "CategoryName": "Grains/Cereals",
        "Description": "Breads, crackers, pasta, and cereal"
    }
}, {
    "ProductID": 58,
    "ProductName": "Escargots de Bourgogne",
    "SupplierID": 27,
    "CategoryID": 8,
    "QuantityPerUnit": "24 pieces",
    "UnitPrice": 13.2500,
    "UnitsInStock": 62,
    "UnitsOnOrder": 0,
    "ReorderLevel": 20,
    "Discontinued": false,
    "Category": {
        "CategoryID": 8,
        "CategoryName": "Seafood",
        "Description": "Seaweed and fish"
    }
}, {
    "ProductID": 59,
    "ProductName": "Raclette Courdavault",
    "SupplierID": 28,
    "CategoryID": 4,
    "QuantityPerUnit": "5 kg pkg.",
    "UnitPrice": 55.0000,
    "UnitsInStock": 79,
    "UnitsOnOrder": 0,
    "ReorderLevel": 0,
    "Discontinued": false,
    "Category": {
        "CategoryID": 4,
        "CategoryName": "Dairy Products",
        "Description": "Cheeses"
    }
}, {
    "ProductID": 60,
    "ProductName": "Camembert Pierrot",
    "SupplierID": 28,
    "CategoryID": 4,
    "QuantityPerUnit": "15 - 300 g rounds",
    "UnitPrice": 34.0000,
    "UnitsInStock": 19,
    "UnitsOnOrder": 0,
    "ReorderLevel": 0,
    "Discontinued": false,
    "Category": {
        "CategoryID": 4,
        "CategoryName": "Dairy Products",
        "Description": "Cheeses"
    }
}, {
    "ProductID": 61,
    "ProductName": "Sirop d'érable",
    "SupplierID": 29,
    "CategoryID": 2,
    "QuantityPerUnit": "24 - 500 ml bottles",
    "UnitPrice": 28.5000,
    "UnitsInStock": 113,
    "UnitsOnOrder": 0,
    "ReorderLevel": 25,
    "Discontinued": false,
    "Category": {
        "CategoryID": 2,
        "CategoryName": "Condiments",
        "Description": "Sweet and savory sauces, relishes, spreads, and seasonings"
    }
}, {
    "ProductID": 62,
    "ProductName": "Tarte au sucre",
    "SupplierID": 29,
    "CategoryID": 3,
    "QuantityPerUnit": "48 pies",
    "UnitPrice": 49.3000,
    "UnitsInStock": 17,
    "UnitsOnOrder": 0,
    "ReorderLevel": 0,
    "Discontinued": false,
    "Category": {
        "CategoryID": 3,
        "CategoryName": "Confections",
        "Description": "Desserts, candies, and sweet breads"
    }
}, {
    "ProductID": 63,
    "ProductName": "Vegie-spread",
    "SupplierID": 7,
    "CategoryID": 2,
    "QuantityPerUnit": "15 - 625 g jars",
    "UnitPrice": 43.9000,
    "UnitsInStock": 24,
    "UnitsOnOrder": 0,
    "ReorderLevel": 5,
    "Discontinued": false,
    "Category": {
        "CategoryID": 2,
        "CategoryName": "Condiments",
        "Description": "Sweet and savory sauces, relishes, spreads, and seasonings"
    }
}, {
    "ProductID": 64,
    "ProductName": "Wimmers gute Semmelknödel",
    "SupplierID": 12,
    "CategoryID": 5,
    "QuantityPerUnit": "20 bags x 4 pieces",
    "UnitPrice": 33.2500,
    "UnitsInStock": 22,
    "UnitsOnOrder": 80,
    "ReorderLevel": 30,
    "Discontinued": false,
    "Category": {
        "CategoryID": 5,
        "CategoryName": "Grains/Cereals",
        "Description": "Breads, crackers, pasta, and cereal"
    }
}, {
    "ProductID": 65,
    "ProductName": "Louisiana Fiery Hot Pepper Sauce",
    "SupplierID": 2,
    "CategoryID": 2,
    "QuantityPerUnit": "32 - 8 oz bottles",
    "UnitPrice": 21.0500,
    "UnitsInStock": 76,
    "UnitsOnOrder": 0,
    "ReorderLevel": 0,
    "Discontinued": false,
    "Category": {
        "CategoryID": 2,
        "CategoryName": "Condiments",
        "Description": "Sweet and savory sauces, relishes, spreads, and seasonings"
    }
}, {
    "ProductID": 66,
    "ProductName": "Louisiana Hot Spiced Okra",
    "SupplierID": 2,
    "CategoryID": 2,
    "QuantityPerUnit": "24 - 8 oz jars",
    "UnitPrice": 17.0000,
    "UnitsInStock": 4,
    "UnitsOnOrder": 100,
    "ReorderLevel": 20,
    "Discontinued": false,
    "Category": {
        "CategoryID": 2,
        "CategoryName": "Condiments",
        "Description": "Sweet and savory sauces, relishes, spreads, and seasonings"
    }
}, {
    "ProductID": 67,
    "ProductName": "Laughing Lumberjack Lager",
    "SupplierID": 16,
    "CategoryID": 1,
    "QuantityPerUnit": "24 - 12 oz bottles",
    "UnitPrice": 14.0000,
    "UnitsInStock": 52,
    "UnitsOnOrder": 0,
    "ReorderLevel": 10,
    "Discontinued": false,
    "Category": {
        "CategoryID": 1,
        "CategoryName": "Beverages",
        "Description": "Soft drinks, coffees, teas, beers, and ales"
    }
}, {
    "ProductID": 68,
    "ProductName": "Scottish Longbreads",
    "SupplierID": 8,
    "CategoryID": 3,
    "QuantityPerUnit": "10 boxes x 8 pieces",
    "UnitPrice": 12.5000,
    "UnitsInStock": 6,
    "UnitsOnOrder": 10,
    "ReorderLevel": 15,
    "Discontinued": false,
    "Category": {
        "CategoryID": 3,
        "CategoryName": "Confections",
        "Description": "Desserts, candies, and sweet breads"
    }
}, {
    "ProductID": 69,
    "ProductName": "Gudbrandsdalsost",
    "SupplierID": 15,
    "CategoryID": 4,
    "QuantityPerUnit": "10 kg pkg.",
    "UnitPrice": 36.0000,
    "UnitsInStock": 26,
    "UnitsOnOrder": 0,
    "ReorderLevel": 15,
    "Discontinued": false,
    "Category": {
        "CategoryID": 4,
        "CategoryName": "Dairy Products",
        "Description": "Cheeses"
    }
}, {
    "ProductID": 70,
    "ProductName": "Outback Lager",
    "SupplierID": 7,
    "CategoryID": 1,
    "QuantityPerUnit": "24 - 355 ml bottles",
    "UnitPrice": 15.0000,
    "UnitsInStock": 15,
    "UnitsOnOrder": 10,
    "ReorderLevel": 30,
    "Discontinued": false,
    "Category": {
        "CategoryID": 1,
        "CategoryName": "Beverages",
        "Description": "Soft drinks, coffees, teas, beers, and ales"
    }
}, {
    "ProductID": 71,
    "ProductName": "Flotemysost",
    "SupplierID": 15,
    "CategoryID": 4,
    "QuantityPerUnit": "10 - 500 g pkgs.",
    "UnitPrice": 21.5000,
    "UnitsInStock": 26,
    "UnitsOnOrder": 0,
    "ReorderLevel": 0,
    "Discontinued": false,
    "Category": {
        "CategoryID": 4,
        "CategoryName": "Dairy Products",
        "Description": "Cheeses"
    }
}, {
    "ProductID": 72,
    "ProductName": "Mozzarella di Giovanni",
    "SupplierID": 14,
    "CategoryID": 4,
    "QuantityPerUnit": "24 - 200 g pkgs.",
    "UnitPrice": 34.8000,
    "UnitsInStock": 14,
    "UnitsOnOrder": 0,
    "ReorderLevel": 0,
    "Discontinued": false,
    "Category": {
        "CategoryID": 4,
        "CategoryName": "Dairy Products",
        "Description": "Cheeses"
    }
}, {
    "ProductID": 73,
    "ProductName": "Röd Kaviar",
    "SupplierID": 17,
    "CategoryID": 8,
    "QuantityPerUnit": "24 - 150 g jars",
    "UnitPrice": 15.0000,
    "UnitsInStock": 101,
    "UnitsOnOrder": 0,
    "ReorderLevel": 5,
    "Discontinued": false,
    "Category": {
        "CategoryID": 8,
        "CategoryName": "Seafood",
        "Description": "Seaweed and fish"
    }
}, {
    "ProductID": 74,
    "ProductName": "Longlife Tofu",
    "SupplierID": 4,
    "CategoryID": 7,
    "QuantityPerUnit": "5 kg pkg.",
    "UnitPrice": 10.0000,
    "UnitsInStock": 4,
    "UnitsOnOrder": 20,
    "ReorderLevel": 5,
    "Discontinued": false,
    "Category": {
        "CategoryID": 7,
        "CategoryName": "Produce",
        "Description": "Dried fruit and bean curd"
    }
}, {
    "ProductID": 75,
    "ProductName": "Rhönbräu Klosterbier",
    "SupplierID": 12,
    "CategoryID": 1,
    "QuantityPerUnit": "24 - 0.5 l bottles",
    "UnitPrice": 7.7500,
    "UnitsInStock": 125,
    "UnitsOnOrder": 0,
    "ReorderLevel": 25,
    "Discontinued": false,
    "Category": {
        "CategoryID": 1,
        "CategoryName": "Beverages",
        "Description": "Soft drinks, coffees, teas, beers, and ales"
    }
}, {
    "ProductID": 76,
    "ProductName": "Lakkalikööri",
    "SupplierID": 23,
    "CategoryID": 1,
    "QuantityPerUnit": "500 ml",
    "UnitPrice": 18.0000,
    "UnitsInStock": 57,
    "UnitsOnOrder": 0,
    "ReorderLevel": 20,
    "Discontinued": false,
    "Category": {
        "CategoryID": 1,
        "CategoryName": "Beverages",
        "Description": "Soft drinks, coffees, teas, beers, and ales"
    }
}, {
    "ProductID": 77,
    "ProductName": "Original Frankfurter grüne Soße",
    "SupplierID": 12,
    "CategoryID": 2,
    "QuantityPerUnit": "12 boxes",
    "UnitPrice": 13.0000,
    "UnitsInStock": 32,
    "UnitsOnOrder": 0,
    "ReorderLevel": 15,
    "Discontinued": false,
    "Category": {
        "CategoryID": 2,
        "CategoryName": "Condiments",
        "Description": "Sweet and savory sauces, relishes, spreads, and seasonings"
    }
}];

import { enableProdMode } from '@angular/core';
import { platformBrowserDynamic } from '@angular/platform-browser-dynamic';
import { AppModule } from './app.module';

enableProdMode();

const platform = platformBrowserDynamic();
platform.bootstrapModule(AppModule);

Debouncing pageChange Events

When configured for virtualization, the Grid fires the pageChange event as often as possible. This behavior allows for a smoother scrolling experience when the data is available in memory.

If the data is requested from a remote service, it is advisable to debounce or otherwise limit the page changes.

import {
    AfterViewInit,
    Component,
    ViewChild,
    ViewEncapsulation
} from '@angular/core';

import {
    GridComponent,
    GridDataResult,
    PageChangeEvent
} from '@progress/kendo-angular-grid';

import { debounceTime } from 'rxjs/operators';

@Component({
    selector: 'my-app',
    /*
     * Set a fixed row height of 36px (20px line height, 2 * 8px padding)
     *
     * [row height] = [line height] + [padding] + [border]
     *
     * Note: If using the Kendo UI Material theme, add 1px to the row height
     * to account for the bottom border width.
     */
    encapsulation: ViewEncapsulation.None,
    styles: [`
        .k-grid tbody td {
            white-space: nowrap;
            line-height: 20px;
            padding: 8px 12px;
        }
    `],
    template: `
      <kendo-grid #grid
          [data]="gridView"
          [skip]="skip"
          [pageSize]="pageSize"
          scrollable="virtual"
          [rowHeight]="36"
          [height]="350"
        >
        <kendo-grid-column field="id" [width]="80" title="ID"></kendo-grid-column>
        <kendo-grid-column field="firstName" title="First Name" [width]="130"></kendo-grid-column>
        <kendo-grid-column field="lastName" title="Last Name" [width]="130"></kendo-grid-column>
        <kendo-grid-column field="city" title="City" [width]="130"></kendo-grid-column>
        <kendo-grid-column field="title" title="Title" [width]="180"></kendo-grid-column>
      </kendo-grid>
  `
})
export class AppComponent implements AfterViewInit {
    public gridView: GridDataResult;
    public data: any[];
    public pageSize = 100;
    public skip = 0;

    @ViewChild('grid') private grid: GridComponent;

    constructor() {
        this.data = this.createRandomData(100000);
        this.loadProducts();
    }

    public ngAfterViewInit(): void {
        this.grid.pageChange.pipe(debounceTime(500))
            .subscribe((e) => this.pageChange(e));
    }

    public pageChange(event: PageChangeEvent): void {
        this.skip = event.skip;
        this.loadProducts();
    }

    private loadProducts(): void {
        this.gridView = {
            data: this.data.slice(this.skip, this.skip + this.pageSize),
            total: this.data.length
        };
    }

    /* Generating example data */
    private createRandomData(count: number): any[] {
        const firstNames = ['Nancy', 'Andrew', 'Janet', 'Margaret', 'Steven', 'Michael', 'Robert', 'Laura', 'Anne', 'Nige'],
            lastNames = ['Davolio', 'Fuller', 'Leverling', 'Peacock', 'Buchanan', 'Suyama', 'King', 'Callahan', 'Dodsworth', 'White'],
            cities = ['Seattle', 'Tacoma', 'Kirkland', 'Redmond', 'London', 'Philadelphia', 'New York', 'Seattle', 'London', 'Boston'],
            titles = ['Accountant', 'Vice President, Sales', 'Sales Representative', 'Technical Support', 'Sales Manager', 'Web Designer',
                'Software Developer'];

        return Array(count).fill({}).map((_, idx) => ({
            id: idx + 1,
            firstName: firstNames[Math.floor(Math.random() * firstNames.length)],
            lastName: lastNames[Math.floor(Math.random() * lastNames.length)],
            city: cities[Math.floor(Math.random() * cities.length)],
            title: titles[Math.floor(Math.random() * titles.length)]
        })
        );
    }
}

import { NgModule } from '@angular/core';
import { BrowserModule } from '@angular/platform-browser';
import { BrowserAnimationsModule } from '@angular/platform-browser/animations';
import { FormsModule } from '@angular/forms';
import { GridModule } from '@progress/kendo-angular-grid';

import { AppComponent } from './app.component';

@NgModule({
  imports: [ BrowserModule, BrowserAnimationsModule, FormsModule, GridModule ],
  declarations: [ AppComponent ],
  bootstrap: [ AppComponent ]
})

export class AppModule { }

import { enableProdMode } from '@angular/core';
import { platformBrowserDynamic } from '@angular/platform-browser-dynamic';
import { AppModule } from './app.module';

enableProdMode();

const platform = platformBrowserDynamic();
platform.bootstrapModule(AppModule);

In this article