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:
- Set its height either through its
heightinput or through thestyleproperty. - Set the regular or detail row height and the number of records.
- Provide the data for each page through the
pageChangeevent handler.
To work properly, virtual scrolling requires you to set the following configuration options:
- (Required)
scrollable—Set it tovirtual. - (Required)
height - (Required)
rowHeight - (Required)
skip - (Required)
pageSize—To avoid unexpected behavior during scrolling, setpageSizeto at least three times the number of the visible Grid elements. The number of the visible Grid elements is determined by theheightandrowHeightsettings of the Grid. - (Required)
data—Instruct thedataoption to useGridDataResultwith the configuredtotalfield. - (Optional)
detailRowHeight—Set thedetailRowHeightoption only when you use detail rows.
The following example demonstrates how to use virtual scrolling with local data.
import {
Component
} from '@angular/core';
import {
GridDataResult,
PageChangeEvent
} from '@progress/kendo-angular-grid';
@Component({
selector: 'my-app',
template: `
<kendo-grid
[data]="gridView"
[skip]="skip"
[pageSize]="pageSize"
[scrollable]="'virtual'"
[rowHeight]="35"
[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({
encapsulation: ViewEncapsulation.None,
providers: [OrdersService],
selector: 'my-app',
template: `
<kendo-grid
[data]="query | async"
[loading]="loading"
[skip]="state.skip"
[pageSize]="state.take"
[scrollable]="'virtual'"
[rowHeight]="40"
[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>
`,
styles: [`
.k-grid tbody td {
white-space: nowrap;
height: 40px;
}
`]
})
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
} from '@angular/core';
import {
GridDataResult,
PageChangeEvent
} from '@progress/kendo-angular-grid';
@Component({
selector: 'my-app',
template: `
<kendo-grid
[kendoGridGroupBinding]="data"
[navigable]="true"
[groupable]="true"
[sortable]="true"
[pageSize]="80"
[rowHeight]="35"
[height]="450"
scrollable="virtual"
>
<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
} from '@angular/core';
import {
GridComponent,
GridDataResult,
PageChangeEvent
} from '@progress/kendo-angular-grid';
import { debounceTime } from 'rxjs/operators';
@Component({
selector: 'my-app',
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",
"Description": "Sweet and savory sauces, relishes, spreads, and seasonings"
}
}, {
"ProductID": 4,
"ProductName": "Chef Anton's Cajun Seasoning",
"SupplierID": 2,
"CategoryID": 2,
"QuantityPerUnit": "48 - 6 oz jars",
"UnitPrice": 22.0000,
"UnitsInStock": 53,
"UnitsOnOrder": 0,
"ReorderLevel": 0,
"Discontinued": false,
"Category": {
"CategoryID": 2,
"CategoryName": "Condiments",
"Description": "Sweet and savory sauces, relishes, spreads, and seasonings"
}
}, {
"ProductID": 5,
"ProductName": "Chef Anton's Gumbo Mix",
"SupplierID": 2,
"CategoryID": 2,
"QuantityPerUnit": "36 boxes",
"UnitPrice": 21.3500,
"UnitsInStock": 0,
"UnitsOnOrder": 0,
"ReorderLevel": 0,
"Discontinued": true,
"Category": {
"CategoryID": 2,
"CategoryName": "Condiments",
"Description": "Sweet and savory sauces, relishes, spreads, and seasonings"
}
}, {
"ProductID": 6,
"ProductName": "Grandma's Boysenberry Spread",
"SupplierID": 3,
"CategoryID": 2,
"QuantityPerUnit": "12 - 8 oz jars",
"UnitPrice": 25.0000,
"UnitsInStock": 120,
"UnitsOnOrder": 0,
"ReorderLevel": 25,
"Discontinued": false,
"Category": {
"CategoryID": 2,
"CategoryName": "Condiments",
"Description": "Sweet and savory sauces, relishes, spreads, and seasonings"
}
}, {
"ProductID": 7,
"ProductName": "Uncle Bob's Organic Dried Pears",
"SupplierID": 3,
"CategoryID": 7,
"QuantityPerUnit": "12 - 1 lb pkgs.",
"UnitPrice": 30.0000,
"UnitsInStock": 15,
"UnitsOnOrder": 0,
"ReorderLevel": 10,
"Discontinued": false,
"Category": {
"CategoryID": 7,
"CategoryName": "Produce",
"Description": "Dried fruit and bean curd"
}
}, {
"ProductID": 8,
"ProductName": "Northwoods Cranberry Sauce",
"SupplierID": 3,
"CategoryID": 2,
"QuantityPerUnit": "12 - 12 oz jars",
"UnitPrice": 40.0000,
"UnitsInStock": 6,
"UnitsOnOrder": 0,
"ReorderLevel": 0,
"Discontinued": false,
"Category": {
"CategoryID": 2,
"CategoryName": "Condiments",
"Description": "Sweet and savory sauces, relishes, spreads, and seasonings"
}
}, {
"ProductID": 9,
"ProductName": "Mishi Kobe Niku",
"SupplierID": 4,
"CategoryID": 6,
"QuantityPerUnit": "18 - 500 g pkgs.",
"UnitPrice": 97.0000,
"UnitsInStock": 29,
"UnitsOnOrder": 0,
"ReorderLevel": 0,
"Discontinued": true,
"Category": {
"CategoryID": 6,
"CategoryName": "Meat/Poultry",
"Description": "Prepared meats"
}
}, {
"ProductID": 10,
"ProductName": "Ikura",
"SupplierID": 4,
"CategoryID": 8,
"QuantityPerUnit": "12 - 200 ml jars",
"UnitPrice": 31.0000,
"UnitsInStock": 31,
"UnitsOnOrder": 0,
"ReorderLevel": 0,
"Discontinued": false,
"Category": {
"CategoryID": 8,
"CategoryName": "Seafood",
"Description": "Seaweed and fish"
}
}, {
"ProductID": 11,
"ProductName": "Queso Cabrales",
"SupplierID": 5,
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"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
} from '@angular/core';
import {
GridComponent,
GridDataResult,
PageChangeEvent
} from '@progress/kendo-angular-grid';
import { debounceTime } from 'rxjs/operators';
@Component({
selector: 'my-app',
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);