Local Virtual Scrolling
Documentation
The DataGrid widget supports virtual record scrolling, allowing end users to navigate the contents of the widget by using its vertical scrollbar. In this demo, the DataGrid is connected to 100,000 records and virtual scroll mode has been enabled to simplify record navigation and eliminate the use of data pagers.
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<dx-data-grid
id="gridContainer"
[dataSource]="dataSource"
[customizeColumns]="customizeColumns"
[showBorders]="true"
(onContentReady)="onContentReady($event)">
<dxo-load-panel [enabled]="true"></dxo-load-panel>
<dxo-scrolling mode="virtual"></dxo-scrolling>
<dxo-sorting mode="none"></dxo-sorting>
</dx-data-grid>
import { NgModule, Component, enableProdMode } from '@angular/core';
import { BrowserModule } from '@angular/platform-browser';
import { platformBrowserDynamic } from '@angular/platform-browser-dynamic';
import { DxDataGridModule } from 'devextreme-angular';
import { Service, Employee } from './app.service';
if(!/localhost/.test(document.location.host)) {
enableProdMode();
}
@Component({
selector: 'demo-app',
templateUrl: 'app/app.component.html',
styleUrls: ['app/app.component.css'],
providers: [Service]
})
export class AppComponent {
dataSource: any;
constructor(service: Service) {
this.dataSource = {
store: service.generateData(100000)
};
}
customizeColumns(columns) {
columns[0].width = 70;
}
onContentReady(e) {
e.component.option("loadPanel.enabled", false);
}
}
@NgModule({
imports: [
BrowserModule,
DxDataGridModule
],
declarations: [AppComponent],
bootstrap: [AppComponent]
})
export class AppModule { }
platformBrowserDynamic().bootstrapModule(AppModule);
::ng-deep #gridContainer {
height: 440px;
}
import { Injectable } from '@angular/core';
export class Employee {
id: number;
firstName: string;
lastName: string;
gender: string;
birthDate: Date;
}
let employees: Employee[] = [];
let surnames: string[] = [
"Smith",
"Johnson",
"Brown",
"Taylor",
"Anderson",
"Harris",
"Clark",
"Allen",
"Scott",
"Carter"];
let names: string[] = [
"James",
"John",
"Robert",
"Christopher",
"George",
"Mary",
"Nancy",
"Sandra",
"Michelle",
"Betty"];
let gender: string[] = ["Male", "Female"];
let s: number = 123456789;
@Injectable()
export class Service {
random() {
s = (1103515245 * s + 12345) % 2147483647;
return s % (10 - 1);
}
generateData(count: number) {
let i: number,
startBirthDate = Date.parse("1/1/1975"),
endBirthDate = Date.parse("1/1/1992");
for (i = 0; i < count; i++) {
let birthDate = new Date(startBirthDate + Math.floor(
this.random() *
(endBirthDate - startBirthDate) / 10));
birthDate.setHours(12);
let nameIndex = this.random();
let item = {
id: i + 1,
firstName: names[nameIndex],
lastName: surnames[this.random()],
gender: gender[Math.floor(nameIndex / 5)],
birthDate: birthDate
};
employees.push(item);
}
return employees;
}
}
// In real applications, you should not transpile code in the browser. You can see how to create your own application with Angular and DevExtreme here:
// https://github.com/DevExpress/devextreme-angular/blob/master/README.md
System.config({
transpiler: 'ts',
typescriptOptions: {
module: "commonjs",
emitDecoratorMetadata: true,
experimentalDecorators: true
},
meta: {
'typescript': {
"exports": "ts"
}
},
paths: {
'npm:': 'https://unpkg.com/'
},
map: {
'ts': 'npm:plugin-typescript@8.0.0/lib/plugin.js',
'typescript': 'npm:typescript@3.4.5/lib/typescript.js',
'@angular/core': 'npm:@angular/core@8.0.0/bundles/core.umd.js',
'@angular/common': 'npm:@angular/common@8.0.0/bundles/common.umd.js',
'@angular/compiler': 'npm:@angular/compiler@8.0.0/bundles/compiler.umd.js',
'@angular/platform-browser': 'npm:@angular/platform-browser@8.0.0/bundles/platform-browser.umd.js',
'@angular/platform-browser-dynamic': 'npm:@angular/platform-browser-dynamic@8.0.0/bundles/platform-browser-dynamic.umd.js',
'@angular/router': 'npm:@angular/router@8.0.0/bundles/router.umd.js',
'@angular/forms': 'npm:@angular/forms@8.0.0/bundles/forms.umd.js',
'@angular/common/http': 'npm:@angular/common@8.0.0/bundles/common-http.umd.js',
'tslib': 'npm:tslib/tslib.js',
'rxjs': 'npm:rxjs@6.3.3',
'rxjs/operators': 'npm:rxjs@6.3.3/operators',
'devextreme': 'npm:devextreme@19.1',
'jszip': 'npm:jszip@3.1.3/dist/jszip.min.js',
'quill': 'npm:quill@1.3.6/dist/quill.js',
'devexpress-diagram': 'npm:devexpress-diagram',
'devextreme-angular': 'npm:devextreme-angular@19.1'
},
packages: {
'app': {
main: './app.component.ts',
defaultExtension: 'ts'
},
'devextreme': {
defaultExtension: 'js'
},
'rxjs': { main: 'index.js', defaultExtension: 'js' },
'rxjs/operators': { main: 'index.js', defaultExtension: 'js' },
'devextreme-angular': {
main: 'index.js',
defaultExtension: 'js'
}
}
});
<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<title>DevExtreme Demo</title>
<meta http-equiv="X-UA-Compatible" content="IE=edge" />
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<meta name="viewport" content="width=device-width, initial-scale=1.0, maximum-scale=1.0" />
<link rel="stylesheet" type="text/css" href="https://cdn3.devexpress.com/jslib/19.1.4/css/dx.common.css" />
<link rel="stylesheet" type="text/css" href="https://cdn3.devexpress.com/jslib/19.1.4/css/dx.light.css" />
<script src="https://unpkg.com/core-js@2.4.1/client/shim.min.js"></script>
<script src="https://unpkg.com/zone.js@0.6.25/dist/zone.js"></script>
<script src="https://unpkg.com/reflect-metadata@0.1.3/Reflect.js"></script>
<script src="https://unpkg.com/systemjs@0.21.3/dist/system.js"></script>
<script src="config.js"></script>
<script>
System.import('app').catch(console.error.bind(console));
</script>
</head>
<body class="dx-viewport">
<div class="demo-container">
<demo-app>Loading...</demo-app>
</div>
</body>
</html>