DevExtreme Angular - Enable Grouping

The Lookup can organize items in groups. If you use a simple array as a data source, its objects must have the key and items fields.

jQuery
JavaScript
var lookupData = [{
    key: "Mr. John Heart",
    items: ["Google AdWords Strategy", "New Brochures", "Update NDA Agreement"]
}, {
    key: "Mrs. Olivia Peyton",
    items: ["Update Personnel Files", "Non-Compete Agreements", "Give Final Approval for Refunds"]
}, // ... 
];

$(function() {
    $("#lookupContainer").dxLookup({
        dataSource: lookupData,
        grouped: true
    });
});
Angular
TypeScript
HTML
import { DxLookupModule } from "devextreme-angular";
// ...
export class AppComponent {
    lookupDataSource = [{
        key: "Mr. John Heart",
        items: ["Google AdWords Strategy", "New Brochures", "Update NDA Agreement"]
    }, {
        key: "Mrs. Olivia Peyton",
        items: ["Update Personnel Files", "Non-Compete Agreements", "Give Final Approval for Refunds"]
    }, // ... 
    ];
}
@NgModule({
    imports: [
        // ...
        DxLookupModule
    ],
    // ...
})
<dx-lookup
    [dataSource]="lookupDataSource"
    [grouped]="true">
</dx-lookup>
NOTE
Only one-level grouping is supported.

If you use the DevExtreme DataSource, specify its group option. In both cases, you need to make the Lookup know that its data source is grouped by assigning true to the grouped option.

jQuery
JavaScript
var lookupData = [
    { name: "Amelia", birthYear: 1991, gender: "female" },
    { name: "Benjamin", birthYear: 1983, gender: "male" },
    { name: "Andrew", birthYear: 1991, gender: "male" },
    { name: "Daniela", birthYear: 1983, gender: "female" },
    { name: "Lee", birthYear: 1983, gender: "male" },
    { name: "Betty", birthYear: 1983, gender: "female" }
];

$(function() {
    $("#lookupContainer").dxLookup({
        dataSource: new DevExpress.data.DataSource({ 
            store: lookupData, 
            group: "gender"
        }),
        grouped: true,
        displayExpr: "name",
        valueExpr: "name"
    });
});
Angular
TypeScript
HTML
import { DxLookupModule } from "devextreme-angular";
import DataSource from "devextreme/data/data_source";
// ...
export class AppComponent {
    data = [
        { name: "Amelia", birthYear: 1991, gender: "female" },
        { name: "Benjamin", birthYear: 1983, gender: "male" },
        { name: "Andrew", birthYear: 1991, gender: "male" },
        { name: "Daniela", birthYear: 1983, gender: "female" },
        { name: "Lee", birthYear: 1983, gender: "male" },
        { name: "Betty", birthYear: 1983, gender: "female" }
    ];
    lookupDataSource = new DataSource({
        store: data, 
        group: "gender"
    });
}
@NgModule({
    imports: [
        // ...
        DxLookupModule
    ],
    // ...
})
<dx-lookup
    [dataSource]="lookupDataSource"
    [grouped]="true"
    displayExpr="name"
    valueExpr="name">
</dx-lookup>

You can define a custom template for the group headers. For Angular, AngularJS and Knockout apps, DevExtreme provides a markup component called dxTemplate. The following code shows how you can use dxTemplate to define a template for the Lookup group headers.

Angular
HTML
TypeScript
<dx-lookup
    [dataSource]="lookupDataSource"
    [grouped]="true"
    groupTemplate="groupTemplate">
    <div *dxTemplate="let group of 'groupTemplate'; let i = index">
        <div>[{{i + 1}}] Assigned: {{group.key}}</div>
    </div>
</dx-lookup>
import { DxLookupModule } from "devextreme-angular";
import DataSource from "devextreme/data/data_source";
// ...
export class AppComponent {
    lookupDataSource = [{
        key: "Mr. John Heart",
        items: ["Google AdWords Strategy", "New Brochures", "Update NDA Agreement"]
    }, {
        key: "Mrs. Olivia Peyton",
        items: ["Update Personnel Files", "Non-Compete Agreements", "Give Final Approval for Refunds"]
    }, // ... 
    ];
}
@NgModule({
    imports: [
        // ...
        DxLookupModule
    ],
    // ...
})
AngularJS
HTML
JavaScript
<div ng-controller="DemoController">
    <div dx-lookup="{
        dataSource: lookupData,
        groupTemplate: 'group',
        grouped: true
    }" dx-item-alias="product">
        <div data-options="dxTemplate: { name: 'group' }">
            <div>[{{$index + 1}}] Assigned: {{product.key}}</div>
        </div>
    </div>
</div>
angular.module('DemoApp', ['dx'])
    .controller('DemoController', function ($scope) {
        $scope.lookupData = [{
            key: "Mr. John Heart",
            items: ["Google AdWords Strategy", "New Brochures", "Update NDA Agreement"]
        }, {
            key: "Mrs. Olivia Peyton",
            items: ["Update Personnel Files", "Non-Compete Agreements", "Give Final Approval for Refunds"]
        }, // ... 
        ];
    });
NOTE
The dx-item-alias directive specifies the variable that is used to access the item object.
Knockout
HTML
JavaScript
<div data-bind="dxLookup: {
    dataSource: lookupData,
    grouped: true,
    groupTemplate: 'group'
}">
    <div data-options="dxTemplate: { name: 'group' }">
        <div>[<span data-bind="text: $index + 1"></span>] Assigned: <span data-bind="text: key"></span></div>
    </div>
</div>
var viewModel = {
    lookupData: [{
        key: "Mr. John Heart",
        items: ["Google AdWords Strategy", "New Brochures", "Update NDA Agreement"]
    }, {
        key: "Mrs. Olivia Peyton",
        items: ["Update Personnel Files", "Non-Compete Agreements", "Give Final Approval for Refunds"]
    }, // ... 
    ]
};

ko.applyBindings(viewModel);

If you use jQuery alone, combine the HTML markup for items manually with jQuery DOM manipulation methods. To apply this markup, use the itemTemplate callback function as shown in the following code.

JavaScript
var lookupData = [{
    key: "Mr. John Heart",
    items: ["Google AdWords Strategy", "New Brochures", "Update NDA Agreement"]
}, {
    key: "Mrs. Olivia Peyton",
    items: ["Update Personnel Files", "Non-Compete Agreements", "Give Final Approval for Refunds"]
}, // ... 
];

$(function() {
    $("#lookupContainer").dxLookup({
        dataSource: lookupData,
        grouped: true,
        groupTemplate: function (data) {
            return $("<div>Assigned: " + data.key + "</div>");
        }
    });
});
See Also