Backend API
@model IEnumerable<DevExtreme.NETCore.Demos.Models.ElectronicsItem>
<div class="dx-fieldset">
<div class="dx-field">
<div class="dx-field-label">Grouped items</div>
<div class="dx-field-value">
@(Html.DevExtreme().TagBox()
.DataSource(Model)
.InputAttr("aria-label", "Category")
.DataSourceOptions(o => o.Group("Category"))
.ValueExpr("ID")
.Value(new[] { 17, 19 })
.Grouped(true)
.DisplayExpr("Name")
)
</div>
</div>
<div class="dx-field">
<div class="dx-field-label">Grouped items with search enabled</div>
<div class="dx-field-value">
@(Html.DevExtreme().TagBox()
.DataSource(Model)
.InputAttr("aria-label", "Category")
.DataSourceOptions(o => o.Group("Category"))
.ValueExpr("ID")
.Value(new[] { 17, 19 })
.Grouped(true)
.DisplayExpr("Name")
.SearchEnabled(true)
)
</div>
</div>
<div class="dx-field">
<div class="dx-field-label">Grouped items with a custom group template</div>
<div class="dx-field-value">
@(Html.DevExtreme().TagBox()
.DataSource(Model)
.DataSourceOptions(o => o.Group("Category"))
.ValueExpr("ID")
.InputAttr("aria-label", "Category")
.Value(new[] { 18 })
.Grouped(true)
.DisplayExpr("Name")
.GroupTemplate(@<text>
<div class="custom-icon"><span class="dx-icon-box icon"></span><%- key %></div>
</text>)
)
</div>
</div>
</div>
using DevExtreme.AspNet.Data;
using DevExtreme.AspNet.Mvc;
using DevExtreme.NETCore.Demos.Models.SampleData;
using DevExtreme.NETCore.Demos.ViewModels;
using Microsoft.AspNetCore.Mvc;
using System.Linq;
namespace DevExtreme.NETCore.Demos.Controllers {
public class TagBoxController : Controller {
public ActionResult Grouping() {
return View(SampleData.Electronics);
}
}
}
using System;
using System.Collections.Generic;
using System.Linq;
namespace DevExtreme.NETCore.Demos.Models.SampleData {
public partial class SampleData {
public static readonly IEnumerable<ElectronicsItem> Electronics = new[] {
new ElectronicsItem {
ID = 1,
Name = "HD Video Player",
Price = 330,
CurrentInventory = 225,
Backorder = 0,
Manufacturing = 10,
Category = "Video Players",
ImageSrc = "../../images/products/1-small.png",
IconSrc = "../../images/icons/video-player.svg"
},
new ElectronicsItem {
ID = 2,
Name = "SuperHD Player",
Price = 400,
CurrentInventory = 150,
Backorder = 0,
Manufacturing = 25,
Category = "Video Players",
ImageSrc = "../../images/products/2-small.png",
IconSrc = "../../images/icons/video-player.svg"
},
new ElectronicsItem {
ID = 3,
Name = "SuperPlasma 50",
Price = 2400,
CurrentInventory = 0,
Backorder = 0,
Manufacturing = 0,
Category = "Televisions",
ImageSrc = "../../images/products/3-small.png",
IconSrc = "../../images/icons/tv.svg"
},
new ElectronicsItem {
ID = 4,
Name = "SuperLED 50",
Price = 1600,
CurrentInventory = 77,
Backorder = 0,
Manufacturing = 55,
Category = "Televisions",
ImageSrc = "../../images/products/4-small.png",
IconSrc = "../../images/icons/tv.svg"
},
new ElectronicsItem {
ID = 5,
Name = "SuperLED 42",
Price = 1450,
CurrentInventory = 445,
Backorder = 0,
Manufacturing = 0,
Category = "Televisions",
ImageSrc = "../../images/products/5-small.png",
IconSrc = "../../images/icons/tv.svg"
},
new ElectronicsItem {
ID = 6,
Name = "SuperLED 55",
Price = 1350,
CurrentInventory = 345,
Backorder = 0,
Manufacturing = 5,
Category = "Televisions",
ImageSrc = "../../images/products/6-small.png",
IconSrc = "../../images/icons/tv.svg"
},
new ElectronicsItem {
ID = 7,
Name = "SuperLCD 42",
Price = 1200,
CurrentInventory = 210,
Backorder = 0,
Manufacturing = 20,
Category = "Televisions",
ImageSrc = "../../images/products/7-small.png",
IconSrc = "../../images/icons/tv.svg"
},
new ElectronicsItem {
ID = 8,
Name = "SuperPlasma 65",
Price = 3500,
CurrentInventory = 0,
Backorder = 0,
Manufacturing = 0,
Category = "Televisions",
ImageSrc = "../../images/products/8-small.png",
IconSrc = "../../images/icons/tv.svg"
},
new ElectronicsItem {
ID = 9,
Name = "SuperLCD 70",
Price = 4000,
CurrentInventory = 95,
Backorder = 0,
Manufacturing = 5,
Category = "Televisions",
ImageSrc = "../../images/products/9-small.png",
IconSrc = "../../images/icons/tv.svg"
},
new ElectronicsItem {
ID = 10,
Name = "DesktopLED 21",
Price = 175,
CurrentInventory = 0,
Backorder = 425,
Manufacturing = 75,
Category = "Monitors",
ImageSrc = "../../images/products/10-small.png",
IconSrc = "../../images/icons/tv.svg"
},
new ElectronicsItem {
ID = 11,
Name = "DesktopLED 19",
Price = 165,
CurrentInventory = 425,
Backorder = 0,
Manufacturing = 110,
Category = "Monitors",
ImageSrc = "../../images/products/11-small.png",
IconSrc = "../../images/icons/tv.svg"
},
new ElectronicsItem {
ID = 12,
Name = "DesktopLCD 21",
Price = 170,
CurrentInventory = 210,
Backorder = 0,
Manufacturing = 60,
Category = "Monitors",
ImageSrc = "../../images/products/12-small.png",
IconSrc = "../../images/icons/tv.svg"
},
new ElectronicsItem {
ID = 13,
Name = "DesktopLCD 19",
Price = 160,
CurrentInventory = 150,
Backorder = 0,
Manufacturing = 210,
Category = "Monitors",
ImageSrc = "../../images/products/13-small.png",
IconSrc = "../../images/icons/tv.svg"
},
new ElectronicsItem {
ID = 14,
Name = "Projector Plus",
Price = 550,
CurrentInventory = 0,
Backorder = 55,
Manufacturing = 10,
Category = "Monitors",
ImageSrc = "../../images/products/14-small.png",
IconSrc = "../../images/icons/video-player.svg"
},
new ElectronicsItem {
ID = 15,
Name = "Projector PlusHD",
Price = 750,
CurrentInventory = 110,
Backorder = 0,
Manufacturing = 90,
Category = "Projectors",
ImageSrc = "../../images/products/15-small.png",
IconSrc = "../../images/icons/video-player.svg"
},
new ElectronicsItem {
ID = 16,
Name = "Projector PlusHT",
Price = 1050,
CurrentInventory = 0,
Backorder = 75,
Manufacturing = 57,
Category = "Projectors",
ImageSrc = "../../images/products/16-small.png",
IconSrc = "../../images/icons/video-player.svg"
},
new ElectronicsItem {
ID = 17,
Name = "ExcelRemote IR",
Price = 150,
CurrentInventory = 650,
Backorder = 0,
Manufacturing = 190,
Category = "Automation",
ImageSrc = "../../images/products/17-small.png",
IconSrc = "../../images/icons/video-player.svg"
},
new ElectronicsItem {
ID = 18,
Name = "ExcelRemote BT",
Price = 180,
CurrentInventory = 310,
Backorder = 0,
Manufacturing = 0,
Category = "Automation",
ImageSrc = "../../images/products/18-small.png",
IconSrc = "../../images/icons/video-player.svg"
},
new ElectronicsItem {
ID = 19,
Name = "ExcelRemote IP",
Price = 200,
CurrentInventory = 0,
Backorder = 325,
Manufacturing = 225,
Category = "Automation",
ImageSrc = "../../images/products/19-small.png",
IconSrc = "../../images/icons/video-player.svg"
}
};
}
}
using System;
using System.Collections.Generic;
using System.Linq;
namespace DevExtreme.NETCore.Demos.Models {
public class ElectronicsItem {
public int ID { get; set; }
public string Category { get; set; }
public string Name { get; set; }
public int CurrentInventory { get; set; }
public int Backorder { get; set; }
public int Manufacturing { get; set; }
public int Price { get; set; }
public string ImageSrc { get; set; }
public string IconSrc { get; set; }
}
}
.custom-icon .icon {
color: #f05b41;
}
.custom-icon {
display: flex;
align-items: center;
gap: 4px;
}
.dx-field {
margin-bottom: 50px;
}
Ensure the data source defines the hierarchy in one of the following ways:
-
Grouping Field
The data source can contain a plain array of objects with multiple fields. Assign a field to the DataSource's group property to create a hierarchical display. Parent items display unique values from the specified field, and Child items display grouped values. This demo shows how to use this data source type. -
Hierarchical Data Source Structure
You can use a dataSource where each entry is an object that contains the key and items fields. The key field specifies the group header (parent), and the items field holds an array of child items. A data source can specify different field names if the data is structured in the same way. In this case, implement the DataSource's map function to create key and items field mappings. Refer to the following help topic for more information: Item Mapping.
This demo also shows how to customize the appearance of group headers (the groupTemplate property) and enable search (the searchEnabled property).