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Showing content from https://js.devexpress.com/Vue/Documentation/ApiReference/UI_Components/dxList/Configuration/items/ below:

Vue List - items | Vue Documentation

An array of items displayed by the UI component.

The items array can contain:

Strings
Objects with fields described in this section
Objects with any other fields. In this case, specify the itemTemplate.

If you need to update the UI component items, reassign the entire items array as shown in the following example:

listInstance.option('items', newItems);

As an alternative to items, you can use the dataSource property. It accepts the DataSource object, whose underlying stores provide an API that allows you to update individual items without reassigning the entire item collection.

Do not use the items property if you use dataSource, and vice versa.

View Demo

Specifies the text of a badge displayed for the list item.

If the property value is undefined or an empty string, the badge is not displayed.

Specifies whether the UI component item responds to user interaction.

Specifies the HTML markup to be inserted into the item element.

The List component evaluates the html property's value. This evaluation, however, makes the List potentially vulnerable to XSS attacks. To guard against these attacks, encode the HTML markup before you assign it to the html property. Refer to the following help topic for more information: Potentially Vulnerable API - html.

You can use the text property as a safe alternative.

Specifies the list item's icon.

Specifies the name of the list items group in a grouped list.

Specifies whether or not to display a chevron for the list item.

Specifies a template that should be used to render this item only.

jQuery

The following types of the specified value are available.

Assign a string containing the name of the required template.
Assign a jQuery object of the template's container.
Assign a DOM Node of the template's container.
Assign a function that returns the jQuery object or a DOM Node of the template's container.

The following example adds a custom item to the component.

$(function() {
    $("#listContainer").dxList({
        // ...
        items: [
            {
                // ...
                template: '<div>Custom Item</div>'
            }
        ]
    });
});

Angular

The following types of the specified value are available.

Assign a string containing the name of the required template.
Assign a DOM Node of the template's container.

The following example adds a custom item to the component. Note that Angular uses custom templates instead of the template property.

<dx-list ... >
    <dxi-item ... >
        <div *dxTemplate>
            <div>Custom Item</div>
        </div>
    </dxi-item>
</dx-list>

import { Component } from '@angular/core';

@Component({
    selector: 'app-root',
    templateUrl: './app.component.html',
    styleUrls: ['./app.component.css']
})
export class AppComponent {
    // ...
}

import { BrowserModule } from '@angular/platform-browser';
import { NgModule } from '@angular/core';
import { AppComponent } from './app.component';

import { DxListModule } from 'devextreme-angular';

@NgModule({
    declarations: [
        AppComponent
    ],
    imports: [
        BrowserModule,
        DxListModule
    ],
    providers: [ ],
    bootstrap: [AppComponent]
})
export class AppModule { }

Vue

The following types of the specified value are available.

Assign a string containing the name of the required template.
Assign a DOM Node of the template's container.

The following example adds a custom item to the component. Note that Vue uses custom templates instead of the template property.

<template>
    <DxList ... >
        <dxItem ... >
            <div>Custom Item</div>
        </dxItem>
    </DxList>
</template>

<script>

import DxList, {
    DxItem
} from 'devextreme-vue/list';

export default {
    components: {
        DxList,
        DxItem
    },
    // ...
}
</script>

React

The following types of the specified value are available.

Assign a string containing the name of the required template.
Assign a DOM Node of the template's container.

The following example adds a custom item to the component. In React, specify the render or component properties.

import React from 'react';

import List, {
    Item
} from 'devextreme-react/list';

const renderCustomItem = () => {
    return <div>Custom Item</div>;
}

const App() = () => {
    return (
        <List ... >
            <Item ...
                render={renderCustomItem}
            >
            </Item>
        </List>
    );
}
export default App;