DevExtreme Angular - Customize the Appearance

You can customize the text field and the drop-down button using the fieldTemplate and dropDownButtonTemplate. To adjust the drop-down field, use the dropDownOptions object that contains options described in the Popup Configuration section.

jQuery
JavaScript
CSS
$(function () {
    var fruits = [
        { id: 1, text: "Apples", image: "images/Apples.svg" }, 
        { id: 2, text: "Oranges", image: "images/Oranges.svg" }, 
        { id: 3, text: "Lemons", image: "images/Lemons.svg" }, 
        { id: 4, text: "Pears", image: "images/Pears.svg" }, 
        { id: 5, text: "Pineapples", image: "images/Pineapples.svg" }
    ];
    $("#dropDownBoxContainer").dxDropDownBox({
        value: fruits[0],
        dataSource: new DevExpress.data.DataSource({
            store: new DevExpress.data.ArrayStore({ data: fruits, key: "id" }),
        }),
        dropDownOptions: {
            title: "Fruits",
            showTitle: true,
            fullScreen: true,
            showCloseButton: true
        },
        dropDownButtonTemplate: function() {
            return $("<img />").attr("src", "images/icons/custom-dropbutton-icon.svg");
        },
        fieldTemplate: function (value, fieldElement) {
            return $("<div class='custom-item' />").append(
                $("<img />").attr("src", value.image),
                $("<div class='product-name' />").dxTextBox({ value: value.text, readOnly: true })
            );
        },
        contentTemplate: function(e) {
            var list = $("<div>").dxList({
                dataSource: e.component.option("dataSource"),
                selectionMode: "single",
                onSelectionChanged: function(arg) {
                    e.component.option("value", arg.addedItems[0]);
                    e.component.close();
                } 
            });
            return list;
        }
    });
});
.custom-item {
    position: relative;
    min-height: 30px;
}
.custom-item > img {
    left: 1px;
    margin-top: 3px;
    max-height: 30px;
    width: auto;
    position: absolute;
}
.product-name  {
    display: inline-block;
    padding-left: 45px;
    text-indent: 0;
    line-height: 30px;
    font-size: 15px;
    width: 100%;
}
Angular
HTML
TypeScript
CSS
<dx-drop-down-box
    [(value)]="selectedFruit"
    [(opened)]="isDropDownBoxOpened"
    fieldTemplate="fieldTemplate"
    dropDownButtonTemplate="dropDownButtonTemplate"
    [dataSource]="dataSource">
    <dxo-drop-down-options
        title="Fruits"
        [showTitle]="true"
        [fullScreen]="true"
        [showCloseButton]="true">
    </dxo-drop-down-options>
    <div *dxTemplate="let contentData of 'content'">
        <dx-list 
            [dataSource]="fruits"
            selectionMode="single"
            (onSelectionChanged)="changeDropDownBoxValue($event)">
        </dx-list>
    </div>
    <div *dxTemplate="let data of 'dropDownButtonTemplate'">
        <img src="images/icons/custom-dropbutton-icon.svg">
    </div>
    <div *dxTemplate="let data of 'fieldTemplate'">
        <div class="custom-item">
            <img src="{{data.image}}">
            <div class="product-name">
                <dx-text-box
                    [value]="data.text"
                    [readOnly]="true">
                </dx-text-box>
            </div>
        </div>
    </div>
</dx-drop-down-box>
import { DxDropDownBoxModule, DxListModule, DxTextBoxModule } from "devextreme-angular";
import DataSource from "devextreme/data/data_source";
import ArrayStore from "devextreme/data/array_store";
// ...
export class AppComponent {
    fruits = [
        { id: 1, text: "Apples", image: "images/Apples.svg" }, 
        { id: 2, text: "Oranges", image: "images/Oranges.svg" }, 
        { id: 3, text: "Lemons", image: "images/Lemons.svg" }, 
        { id: 4, text: "Pears", image: "images/Pears.svg" }, 
        { id: 5, text: "Pineapples", image: "images/Pineapples.svg" }
    ];
    dataSource: DataSource;
    selectedFruit = this.fruits[0];
    isDropDownBoxOpened: Boolean = false;
    constructor() {
        this.dataSource = new DataSource({
            store: new ArrayStore({ data: fruits, key: "id" })
        });
    }
    changeDropDownBoxValue = function (args) {
        this.selectedFruit = args.addedItems[0];
        this.isDropDownBoxOpened = false;
    }
}
@NgModule({
    imports: [
        // ...
        DxDropDownBoxModule,
        DxListModule,
        DxTextBoxModule
    ],
    // ...
})
::ng-deep .custom-item {
    position: relative;
    min-height: 30px;
}
::ng-deep .custom-item > img {
    left: 1px;
    margin-top: 3px;
    max-height: 30px;
    width: auto;
    position: absolute;
}
::ng-deep .product-name  {
    display: inline-block;
    padding-left: 45px;
    text-indent: 0;
    line-height: 30px;
    font-size: 15px;
    width: 100%;
}