Convert complex JSON to flat JSON and assign it to the pivot table in Angular Pivotview component

27 Apr 202421 minutes to read

By default, flat JSON can only bind to the pivot table. However, you can connect complex JSON to the pivot table by converting it to flat JSON via code-behind and binding it to the pivot table using the dataSource property in the load event.

In the following example, the complexToFlatJson() method is used to convert complex JSON to flat JSON and bind it to the pivot table using the dataSource property, then modifying the field names in the rows and columns based on the converted flat JSON under dataSourceSettings in the load event.

app.component.ts

import { NgModule } from '@angular/core'
import { BrowserModule } from '@angular/platform-browser'
import { PivotViewAllModule, PivotFieldListAllModule } from '@syncfusion/ej2-angular-pivotview'

import { Component, ViewChild, OnInit } from '@angular/core';
import {
    PivotView, FieldListService, IDataOptions, LoadEventArgs
} from '@syncfusion/ej2-angular-pivotview';;
import { enableRipple } from '@syncfusion/ej2-base';
enableRipple(false);

let parentProp: any = {};
let dataSource: Object[][];

@Component({
imports: [
        
        PivotViewAllModule,
        PivotFieldListAllModule
    ],


standalone: true,
    selector: 'app-container',
    providers: [FieldListService],
    // specifies the template string for the pivot table component
    template: `<ejs-pivotview #pivotview id='PivotView' [dataSourceSettings]=dataSourceSettings 
    showFieldList='true' width='100%'  height='350' showFieldList='true' (load)='load($event)'
    showToolbar='true'></ejs-pivotview>`
})

export class AppComponent implements OnInit {

    public dataSourceSettings?: IDataOptions;

    @ViewChild('pivotview', { static: false })
    public pivotGridObj?: PivotView;

    load(args: LoadEventArgs | any) {
        dataSource = JSON.parse(JSON.stringify(args.dataSourceSettings.dataSource));
        args.dataSourceSettings.dataSource = this.complexToFlatJson(dataSource);
        let rows: any = [];
        for (let i: number = 0; i < args.dataSourceSettings.rows.length; i++) {
            if (args.dataSourceSettings.rows[i].name in parentProp) {
                rows = rows.concat(parentProp[args.dataSourceSettings.rows[i].name]);
            } else {
                rows.push(args.dataSourceSettings.rows[i]);
            }
        }
        args.dataSourceSettings.rows = rows;
        let columns: any = [];
        for (let i: number = 0; i < args.dataSourceSettings.columns.length; i++) {
            if (args.dataSourceSettings.columns[i].name in parentProp) {
                columns = columns.concat(
                    parentProp[args.dataSourceSettings.columns[i].name]
                );
            } else {
                columns.push(args.dataSourceSettings.columns[i]);
            }
        }
        args.dataSourceSettings.columns = columns;
    }

    complexToFlatJson(data: Object[][]) {
        let flatArray: any = [];
        let flatObject: any = {};
        for (let index = 0; index < data.length; index++) {
            for (let prop in data[index]) {
                let value: Object = data[index][prop];
                if (Array.isArray(value)) {
                    for (let i: number = 0; i < value.length; i++) {
                        let childProp: any = [];
                        for (let inProp in value[i]) {
                            flatObject[inProp] = value[i][inProp];
                            let object = {
                                name: inProp,
                            };
                            childProp.push(object);
                        }
                        parentProp[prop] = childProp;
                    }
                } else {
                    flatObject[prop] = value;
                }
            }
            flatArray.push(flatObject);
            flatObject = {};
        }
        return flatArray;
    }

    data() {
        return [
            {
                CustomerID: 'VINET',
                Freight: 32.38,
                OrderDetails: [
                    {
                        OrderID: 10248,
                        OrderDate: '1996-07-04T10:10:00.000Z',
                    }
                ],
                ShipDetails: [
                    {
                        ShipName: 'Vins et alcools Chevalier',
                        ShipAddress: "59 rue de l'Abbaye",
                        ShipCity: 'Reims',
                        ShipRegion: null,
                        ShipCountry: 'France',
                        ShippedDate: '1996-07-16T12:20:00.000Z',
                    }
                ]
            },
            {
                CustomerID: 'GALED',
                Freight: 10.14,
                OrderDetails: [
                    {
                        OrderID: 10366,
                        OrderDate: '1996-11-28T00:00:00.000Z',
                    }
                ],
                ShipDetails: [
                    {
                        ShippedDate: '1996-12-30T00:00:00.000Z',
                        ShipName: 'Galería del gastronómo',
                        ShipAddress: 'Rambla de Cataluña, 23',
                        ShipCity: 'Barcelona',
                        ShipRegion: null,
                        ShipCountry: 'Spain',
                    }
                ]
            },
            {
                CustomerID: 'VAFFE',
                Freight: 13.55,
                OrderDetails: [
                    {
                        OrderID: 10367,
                        OrderDate: '1996-12-02T00:00:00.000Z',
                    }
                ],
                ShipDetails: [
                    {
                        ShippedDate: '1996-12-30T00:00:00.000Z',
                        ShipName: 'Vaffeljernet',
                        ShipAddress: 'Smagsloget 45',
                        ShipCity: 'Århus',
                        ShipRegion: null,
                        ShipCountry: 'Denmark',
                    }
                ]
            },
            {
                CustomerID: 'ERNSH',
                Freight: 101.95,
                OrderDetails: [
                    {
                        OrderID: 10368,
                        OrderDate: '1996-11-29T00:00:00.000Z',
                    }
                ],
                ShipDetails: [
                    {
                        ShippedDate: '1996-12-30T00:00:00.000Z',
                        ShipName: 'Ernst Handel',
                        ShipAddress: 'Kirchgasse 6',
                        ShipCity: 'Graz',
                        ShipRegion: null,
                        ShipCountry: 'Austria',
                    }
                ]
            },
            {
                CustomerID: 'SPLIR',
                Freight: 195.68,
                OrderDetails: [
                    {
                        OrderID: 10369,
                        OrderDate: '1996-11-28T00:00:00.000Z',
                    }
                ],
                ShipDetails: [
                    {
                        ShippedDate: '1996-12-30T00:00:00.000Z',
                        ShipName: 'Split Rail Beer & Ale',
                        ShipAddress: 'P.O. Box 555',
                        ShipCity: 'Lander',
                        ShipRegion: 'WY',
                        ShipCountry: 'USA',
                    },
                ]
            }
        ];
    }
    ngOnInit(): void {

        this.dataSourceSettings = {
            expandAll: true,
            enableSorting: true,
            dataSource: this.data() as any,
            columns: [{ name: 'OrderDetails' }],
            values: [{ name: 'Freight', caption: 'Units Sold' }],
            rows: [{ name: 'ShipDetails' }],
            valueSortSettings: { headerDelimiter: ' - ' },
            formatSettings: [{ name: 'Amount', format: 'C0' }]
        };
    }
}

main.ts

import { bootstrapApplication } from '@angular/platform-browser';
import { AppComponent } from './app.component';
import 'zone.js';
bootstrapApplication(AppComponent).catch((err) => console.error(err));