Horizontal Virtual Scrolling
Documentation
Horizontal virtual scrolling improves the widget's rendering performance because the widget only renders columns that are in the viewpoint. To enable this feature, set the scrolling.columnRenderingMode option to "virtual".
Feel free to share demo-related thoughts here.
If you have technical questions, please create a support ticket in the DevExpress Support Center.
If you have technical questions, please create a support ticket in the DevExpress Support Center.
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<dx-data-grid
id="grid"
[dataSource]="dataSource"
[columnWidth]="100"
[showBorders]="true">
<dxo-paging [enabled]="false"></dxo-paging>
<dxo-scrolling columnRenderingMode="virtual"></dxo-scrolling>
</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 } 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;
columns: any;
constructor(service: Service) {
let columnCount = 500,
rowCount = 50;
this.dataSource = service.getData(rowCount, columnCount);
}
}
@NgModule({
imports: [
BrowserModule,
DxDataGridModule
],
declarations: [AppComponent],
bootstrap: [AppComponent]
})
export class AppModule { }
platformBrowserDynamic().bootstrapModule(AppModule);
::ng-deep #grid {
max-height: 440px;
}
import { Injectable } from '@angular/core';
@Injectable()
export class Service {
getData (rowCount, columnCount) {
var items = [];
for (let i = 0; i < rowCount; i++) {
let item = {};
for (let j = 0; j < columnCount; j++) {
item["field" + (j + 1)] = (i + 1) + "-" + (j + 1);
}
items.push(item);
}
return items;
}
}
// 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://js.devexpress.com/Documentation/Guide/Angular_Components/Getting_Started/Create_a_DevExtreme_Application/
System.config({
transpiler: 'ts',
typescriptOptions: {
module: "system",
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': 'npm:@angular',
'tslib': 'npm:tslib/tslib.js',
'rxjs': 'npm:rxjs',
'devextreme': 'npm:devextreme@20.1',
'jszip': 'npm:jszip@3.1.3/dist/jszip.min.js',
'quill': 'npm:quill@1.3.7/dist/quill.js',
'devexpress-diagram': 'npm:devexpress-diagram@1.0.9',
'devexpress-gantt': 'npm:devexpress-gantt@1.0.7',
'devextreme-angular': 'npm:devextreme-angular@20.1'
},
packages: {
'app': {
main: './app.component.ts',
defaultExtension: 'ts'
},
'devextreme': {
defaultExtension: 'js'
},
'devextreme/events/utils': {
main: 'index'
},
'devextreme/events': {
main: 'index'
},
},
packageConfigPaths: [
"npm:*/package.json",
"npm:@angular/*/package.json",
"npm:@angular/common/*/package.json",
"npm:rxjs/operators/package.json",
"npm:devextreme-angular@20.1/*/package.json",
"npm:devextreme-angular@20.1/ui/*/package.json",
]
});
<!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/20.1.6/css/dx.common.css" />
<link rel="stylesheet" type="text/css" href="https://cdn3.devexpress.com/jslib/20.1.6/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@0.10.2/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>