The virtual scrolling option allows you to load the large amounts of data without performance degradation by rendering rows and columns only in the content viewport. The data will refresh dynamically on vertical or horizontal scroll. This feature can be enabled by setting the enableVirtualization property to true.
To use the virtual scrolling feature, inject the VirtualScroll module in to the pivot grid.
import { IDataOptions, IDataSet, PivotViewComponent, VirtualScroll, Inject } from '@syncfusion/ej2-react-pivotview';
import * as React from 'react';
import * as ReactDOM from 'react-dom';
let date1: number;
let date2: number;
function data(count: number) {
let result: Object[] = [];
let dt: number = 0;
for (let i: number = 1; i < (count + 1); i++) {
dt++;
let round: string;
let toString: string = i.toString();
if (toString.length === 1) {
round = '0000' + (i);
}
else if (toString.length === 2) {
round = '000' + i;
}
else if (toString.length === 3) {
round = '00' + i;
} else if (toString.length === 4) {
round = '0' + i;
} else {
round = toString;
}
result.push({
ProductID: 'PRO-' + round,
Year: "FY " + (dt + 2013),
Price: Math.round(Math.random() * 5000) + 5000,
Sold: Math.round(Math.random() * 80) + 10,
});
if (dt / 4 == 1) {
dt = 0;
}
}
return result;
};
class App extends React.Component<{}, {}>{
public dataSource: IDataOptions = {
data: data(1000),
enableSorting: false,
expandAll: true,
formatSettings: [{ name: 'Price', format: 'C0' }],
rows: [{ name: 'ProductID' }],
columns: [{ name: 'Year' }],
values: [{ name: 'Price', caption: 'Unit Price' }, { name: 'Sold', caption: 'Unit Sold' }]
}
public pivotGridObj: PivotViewComponent;
render() {
return <PivotViewComponent ref={d => this.pivotGridObj = d!} id='PivotView' height={300} width={735} enableVirtualization={true} dataSource={this.dataSource}><Inject services={[VirtualScroll]}/></PivotViewComponent>
}
};
ReactDOM.render(<App />, document.getElementById('pivotview'));The
heightandwidthproperties should be set for virtual scrolling. If it is not defined then the pivot grid will consider its value as300pxand800pxrespectively.