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How To

Work in offline mode

On remote data binding, every time invoking executeQuery will send request to the server and the query will be processed on server-side. To avoid post back to server on calling executeQuery, you can set the DataManager to load all the data on initialization time and make the query processing in client-side. To enable this behavior, you can use offline property of DataManager.

import { Component, OnInit } from '@angular/core';
import { DataManager, Query, ODataAdaptor, ReturnOption } from '@syncfusion/ej2-data';

const SERVICE_URI: string =  'https://js.syncfusion.com/demos/ejServices/Wcf/Northwind.svc/Orders';

@Component({
    selector: 'app-container',
    templateUrl: 'app/app.template.html',
    styles: [`
            .e-table {
                border: solid 1px #e0e0e0;
                border-collapse: collapse;
                font-family: Roboto;
            }

            .e-table td, .e-table th {
                border-style: solid;
                border-width: 1px 0 0;
                border-color: #e0e0e0;
                display: table-cell;
                font-size: 14px;
                line-height: 20px;
                overflow: hidden;
                padding: 8px 21px;
                vertical-align: middle;
                white-space: nowrap;
                width: auto;
            }
    `]
})
export class AppComponent implements OnInit {

    public items: Object[];

    public ngOnInit(): void {
        let dm: DataManager = new DataManager(
            { url: SERVICE_URI, adaptor: new ODataAdaptor, offline: true },
            new Query().take(8)
        );

        dm.ready.then((e: ReturnOption) => this.items = <Object[]>e.result).catch((e) => true);
    }
}

The loaded data will be cached in the json property of DataManager.

Sending additional parameters to server

You can use the addParams method of Query class, to add custom parameter to the data request.

Source
Preview
app.component.ts
app.module.ts
datasource.ts
main.ts
app.template.html
import { Component, OnInit } from '@angular/core';
import { DataManager, Query, ODataAdaptor, ReturnOption } from '@syncfusion/ej2-data';

const SERVICE_URI: string =  'https://js.syncfusion.com/demos/ejServices/Wcf/Northwind.svc/Orders';

@Component({
    selector: 'app-container',
    templateUrl: 'app/app.template.html',
    styles: [`
            .e-table {
                border: solid 1px #e0e0e0;
                border-collapse: collapse;
                font-family: Roboto;
            }

            .e-table td, .e-table th {
                border-style: solid;
                border-width: 1px 0 0;
                border-color: #e0e0e0;
                display: table-cell;
                font-size: 14px;
                line-height: 20px;
                overflow: hidden;
                padding: 8px 21px;
                vertical-align: middle;
                white-space: nowrap;
                width: auto;
            }
    `]
})
export class AppComponent implements OnInit {

    public items: Object[];

    public ngOnInit(): void {
        new DataManager({ url: SERVICE_URI, adaptor: new ODataAdaptor})
        .executeQuery(new Query().addParams('$top', '8')).then((e: ReturnOption) => this.items = <Object[]>e.result).catch((e) => true);
    }
}
import { NgModule } from '@angular/core';
import { BrowserModule } from '@angular/platform-browser';
import { AppComponent } from './app.component';

/**
 * Module
 */
@NgModule({
    imports: [
        BrowserModule,
    ],
    declarations: [AppComponent],
    bootstrap: [AppComponent]
})
export class AppModule { }
export let data: Object[] = [
    {
        OrderID: 10248, CustomerID: 'VINET', EmployeeID: 5, OrderDate: new Date(8364186e5),
        ShipName: 'Vins et alcools Chevalier', ShipCity: 'Reims', ShipAddress: '59 rue de l Abbaye',
        ShipRegion: 'CJ', ShipPostalCode: '51100', ShipCountry: 'France', Freight: 32.38, Verified: !0
    },
    {
        OrderID: 10249, CustomerID: 'TOMSP', EmployeeID: 6, OrderDate: new Date(836505e6),
        ShipName: 'Toms Spezialitäten', ShipCity: 'Münster', ShipAddress: 'Luisenstr. 48',
        ShipRegion: 'CJ', ShipPostalCode: '44087', ShipCountry: 'Germany', Freight: 11.61, Verified: !1
    },
    {
        OrderID: 10250, CustomerID: 'HANAR', EmployeeID: 4, OrderDate: new Date(8367642e5),
        ShipName: 'Hanari Carnes', ShipCity: 'Rio de Janeiro', ShipAddress: 'Rua do Paço, 67',
        ShipRegion: 'RJ', ShipPostalCode: '05454-876', ShipCountry: 'Brazil', Freight: 65.83, Verified: !0
    },
    {
        OrderID: 10251, CustomerID: 'VICTE', EmployeeID: 3, OrderDate: new Date(8367642e5),
        ShipName: 'Victuailles en stock', ShipCity: 'Lyon', ShipAddress: '2, rue du Commerce',
        ShipRegion: 'CJ', ShipPostalCode: '69004', ShipCountry: 'France', Freight: 41.34, Verified: !0
    },
    {
        OrderID: 10252, CustomerID: 'SUPRD', EmployeeID: 4, OrderDate: new Date(8368506e5),
        ShipName: 'Suprêmes délices', ShipCity: 'Charleroi', ShipAddress: 'Boulevard Tirou, 255',
        ShipRegion: 'CJ', ShipPostalCode: 'B-6000', ShipCountry: 'Belgium', Freight: 51.3, Verified: !0
    },
    {
        OrderID: 10253, CustomerID: 'HANAR', EmployeeID: 3, OrderDate: new Date(836937e6),
        ShipName: 'Hanari Carnes', ShipCity: 'Rio de Janeiro', ShipAddress: 'Rua do Paço, 67',
        ShipRegion: 'RJ', ShipPostalCode: '05454-876', ShipCountry: 'Brazil', Freight: 58.17, Verified: !0
    },
    {
        OrderID: 10254, CustomerID: 'CHOPS', EmployeeID: 5, OrderDate: new Date(8370234e5),
        ShipName: 'Chop-suey Chinese', ShipCity: 'Bern', ShipAddress: 'Hauptstr. 31',
        ShipRegion: 'CJ', ShipPostalCode: '3012', ShipCountry: 'Switzerland', Freight: 22.98, Verified: !1
    },
    {
        OrderID: 10255, CustomerID: 'RICSU', EmployeeID: 9, OrderDate: new Date(8371098e5),
        ShipName: 'Richter Supermarkt', ShipCity: 'Genève', ShipAddress: 'Starenweg 5',
        ShipRegion: 'CJ', ShipPostalCode: '1204', ShipCountry: 'Switzerland', Freight: 148.33, Verified: !0
    },
    {
        OrderID: 10256, CustomerID: 'WELLI', EmployeeID: 3, OrderDate: new Date(837369e6),
        ShipName: 'Wellington Importadora', ShipCity: 'Resende', ShipAddress: 'Rua do Mercado, 12',
        ShipRegion: 'SP', ShipPostalCode: '08737-363', ShipCountry: 'Brazil', Freight: 13.97, Verified: !1
    },
    {
        OrderID: 10257, CustomerID: 'HILAA', EmployeeID: 4, OrderDate: new Date(8374554e5),
        ShipName: 'HILARION-Abastos', ShipCity: 'San Cristóbal', ShipAddress: 'Carrera 22 con Ave. Carlos Soublette #8-35',
        ShipRegion: 'Táchira', ShipPostalCode: '5022', ShipCountry: 'Venezuela', Freight: 81.91, Verified: !0
    },
    {
        OrderID: 10258, CustomerID: 'ERNSH', EmployeeID: 1, OrderDate: new Date(8375418e5),
        ShipName: 'Ernst Handel', ShipCity: 'Graz', ShipAddress: 'Kirchgasse 6',
        ShipRegion: 'CJ', ShipPostalCode: '8010', ShipCountry: 'Austria', Freight: 140.51, Verified: !0
    },
    {
        OrderID: 10259, CustomerID: 'CENTC', EmployeeID: 4, OrderDate: new Date(8376282e5),
        ShipName: 'Centro comercial Moctezuma', ShipCity: 'México D.F.', ShipAddress: 'Sierras de Granada 9993',
        ShipRegion: 'CJ', ShipPostalCode: '05022', ShipCountry: 'Mexico', Freight: 3.25, Verified: !1
    },
    {
        OrderID: 10260, CustomerID: 'OTTIK', EmployeeID: 4, OrderDate: new Date(8377146e5),
        ShipName: 'Ottilies Käseladen', ShipCity: 'Köln', ShipAddress: 'Mehrheimerstr. 369',
        ShipRegion: 'CJ', ShipPostalCode: '50739', ShipCountry: 'Germany', Freight: 55.09, Verified: !0
    },
    {
        OrderID: 10261, CustomerID: 'QUEDE', EmployeeID: 4, OrderDate: new Date(8377146e5),
        ShipName: 'Que Delícia', ShipCity: 'Rio de Janeiro', ShipAddress: 'Rua da Panificadora, 12',
        ShipRegion: 'RJ', ShipPostalCode: '02389-673', ShipCountry: 'Brazil', Freight: 3.05, Verified: !1
    },
    {
        OrderID: 10262, CustomerID: 'RATTC', EmployeeID: 8, OrderDate: new Date(8379738e5),
        ShipName: 'Rattlesnake Canyon Grocery', ShipCity: 'Albuquerque', ShipAddress: '2817 Milton Dr.',
        ShipRegion: 'NM', ShipPostalCode: '87110', ShipCountry: 'USA', Freight: 48.29, Verified: !0
    }];
import { platformBrowserDynamic } from '@angular/platform-browser-dynamic';
import { enableProdMode } from '@angular/core';
import { AppModule } from './app.module';

enableProdMode();
platformBrowserDynamic().bootstrapModule(AppModule);
<table class='e-table'>
    <tr><th>Order ID</th><th>Customer ID</th><th>Employee ID</th></tr>
    <tr *ngFor="let item of items">
        <td>{{item.OrderID}}</td><td>{{item.CustomerID}}</td><td>{{item.EmployeeID}}</td>
    </tr>
</table>

Adding custom headers

You can add custom headers to the request made by DataManager using the headers property.

import { DataManager, Query, ReturnOption, ODataAdaptor } from '@syncfusion/ej2-data';

const SERVICE_URI: string =  'https://js.syncfusion.com/demos/ejServices/Wcf/Northwind.svc/Orders';

new DataManager({ url: SERVICE_URI, adaptor: new ODataAdaptor, headers: [{ 'syncfusion': 'true' }] })
    .executeQuery(new Query())
    .then((e: ReturnOption) => {
        //get result from e.result
    });

Adding custom headers while making cross domain request will initiate preflight request.