DevExtreme Angular - Customize Item Appearance

For a minor customization of Lookup items, you can define specific fields in item data objects. For example, the following code generates three items: the first is not customized, the second is disabled and the third is hidden.

HTML
TypeScript
  • <dx-lookup
  • [dataSource]="lookupDataSource"
  • valueExpr="text"
  • displayExpr="text">
  • </dx-lookup>
  • import { DxLookupModule } from "devextreme-angular";
  • // ...
  • export class AppComponent {
  • lookupDataSource = [
  • { text: "HD Video Player" },
  • { text: "SuperHD Video Player", disabled: true },
  • { text: "SuperPlasma 50", visible: false }
  • ];
  • }
  • @NgModule({
  • imports: [
  • // ...
  • DxLookupModule
  • ],
  • // ...
  • })

If you need a more flexible solution, define an itemTemplate. In Angular and Vue, you can declare it in the markup. In React, you can use a rendering function (shown in the code below) or component:

HTML
TypeScript
  • <dx-lookup
  • [dataSource]="lookupDataSource"
  • valueExpr="id"
  • itemTemplate="lookupItem">
  • <div *dxTemplate="let item of 'lookupItem'; let i = index">
  • <img src="{{item.imgSrc}}"/>
  • <div
  • style="display:inline-block"
  • [style.font-style]="i % 2 == 0 ? 'italic' : 'normal'">
  • {{item.name}}
  • </div>
  • </div>
  • </dx-lookup>
  • import { DxLookupModule } from "devextreme-angular";
  • // ...
  • export class AppComponent {
  • lookupDataSource = [{
  • id: 1,
  • name: "HD Video Player",
  • imgSrc: "images/products/1-small.png"
  • }, {
  • id: 2,
  • name: "UltraHD Player",
  • imgSrc: "images/products/2-small.png"
  • },
  • // ...
  • ];
  • }
  • @NgModule({
  • imports: [
  • // ...
  • DxLookupModule
  • ],
  • // ...
  • })

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

JavaScript
  • const lookupData = [{
  • id: 1,
  • name: "HD Video Player",
  • imgSrc: "images/products/1-small.png"
  • }, {
  • id: 2,
  • name: "UltraHD Player",
  • imgSrc: "images/products/2-small.png"
  • },
  • // ...
  • ];
  •  
  • $(function() {
  • $("#lookupContainer").dxLookup({
  • dataSource: lookupData,
  • valueExpr: 'id',
  • displayExpr: 'name',
  • itemTemplate: function (itemData, itemIndex, itemElement) {
  • return $("<div />").append(
  • $("<img />").attr("src", itemData.imgSrc),
  • $("<p />").text(itemData.name)
  • .css("display", "inline-block")
  • .css("font-style", (itemIndex % 2 == 0) ? "italic" : "normal")
  • );
  • }
  • });
  • });

You can also customize an individual Lookup item. For this purpose, declare a template for this item as a script and pass its id to the template field.

HTML
JavaScript
  • <script id="individualTemplate" type="text/html">
  • <!-- ... -->
  • </script>
  • const lookupData = [
  • { text: "SuperHD Player"},
  • { text: "HD Video Player", template: $("#individualTemplate") },
  • // ...
  • ];

Using similar techniques, you can customize the input field of the Lookup. The template for it should be assigned to the fieldTemplate option.

HTML
TypeScript
  • <dx-lookup
  • [dataSource]="lookupDataSource"
  • valueExpr="id"
  • displayExpr="name"
  • fieldTemplate="inputField">
  • <div *dxTemplate="let item of 'inputField'">
  • <img src="{{item.imgSrc}}" />
  • </div>
  • </dx-lookup>
  • import { DxLookupModule } from "devextreme-angular";
  • // ...
  • export class AppComponent {
  • lookupDataSource = [{
  • id: 1,
  • name: "HD Video Player",
  • imgSrc: "images/products/1-small.png"
  • }, {
  • id: 2,
  • name: "UltraHD Player",
  • imgSrc: "images/products/2-small.png"
  • },
  • // ...
  • ];
  • }
  • @NgModule({
  • imports: [
  • // ...
  • DxLookupModule
  • ],
  • // ...
  • })

View Demo

In addition, you can use a 3rd-party template engine to perform the needed customizations. For more information, see the 3rd-Party Template Engines article.

See Also