Feel free to share demo-related thoughts here.
If you have technical questions, please create a support ticket in the DevExpress Support Center.
Thank you for the feedback!
If you have technical questions, please create a support ticket in the DevExpress Support Center.
Backend API
@(Html.DevExtreme().TreeView()
.ID("simple-treeview")
.DataSource(d => d.Mvc().LoadAction("GetHierarchicalData"))
.DisplayExpr("Text")
.ItemsExpr("Items")
.ExpandedExpr("Expanded")
.Width(300)
.OnItemClick("treeViewItemClick")
)
<div id="product-details" class="hidden">
<img src="" />
<div class="name"></div>
<div class="price"></div>
</div>
<script>
function treeViewItemClick(e) {
var item = e.itemData;
if(item.Price) {
$("#product-details").removeClass("hidden");
$("#product-details > img").attr("src", item.Image);
$("#product-details > .price").text("$" + item.Price);
$("#product-details > .name").text(item.Text);
} else {
$("#product-details").addClass("hidden");
}
}
</script>
using DevExtreme.AspNet.Data;
using DevExtreme.AspNet.Mvc;
using DevExtreme.NETCore.Demos.Models.SampleData;
using Microsoft.AspNetCore.Mvc;
using System.Text.Json;
namespace DevExtreme.NETCore.Demos.Controllers {
public class TreeViewController : Controller {
public ActionResult HierarchicalDataStructure() {
return View();
}
[HttpGet]
public object GetHierarchicalData(DataSourceLoadOptions loadOptions) {
return DataSourceLoader.Load(TreeViewHierarchicalData.Products, loadOptions);
}
}
}
using System;
using System.Collections.Generic;
using System.Linq;
namespace DevExtreme.NETCore.Demos.Models {
public class Product {
public string ID { get; set; }
public string CategoryId { get; set; }
public string Text { get; set; }
public bool Expanded { get; set; }
public IEnumerable<Product> Items { get; set; }
public int Price { get; set; }
public string Image { get; set; }
}
}
using System;
using System.Linq;
using System.Collections.Generic;
using DevExtreme.NETCore.Demos.Models.TreeView;
namespace DevExtreme.NETCore.Demos.Models.SampleData {
public static class TreeViewHierarchicalData {
public static readonly Product SuperMartOfTheWest = new Product {
Text = "Super Mart of the West",
Expanded = true,
Items = new[] {
new Product {
Text = "Video Players",
Items = new[] {
new Product {
Text = "HD Video Player",
Price = 220,
Image = "../../images/ProductsLarge/1.png"
},
new Product {
Text = "SuperHD Video Player",
Price = 270,
Image = "../../images/ProductsLarge/2.png"
}
}
},
new Product {
Text = "Televisions",
Expanded = true,
Items = new[] {
new Product {
Text = "SuperLCD 42",
Price = 1200,
Image = "../../images/ProductsLarge/7.png"
},
new Product {
Text = "SuperLED 42",
Price = 1450,
Image = "../../images/ProductsLarge/5.png"
},
new Product {
Text = "SuperLED 50",
Price = 1600,
Image = "../../images/ProductsLarge/4.png"
},
new Product {
Text = "SuperLCD 55",
Price = 1350,
Image = "../../images/ProductsLarge/6.png"
},
new Product {
Text = "SuperLCD 70",
Price = 4000,
Image = "../../images/ProductsLarge/9.png"
}
}
},
new Product {
Text = "Monitors",
Expanded = true,
Items = new[] {
new Product {
Text = "19\"",
Expanded = true,
Items = new[] {
new Product {
Text = "DesktopLCD 19",
Price = 160,
Image = "../../images/ProductsLarge/10.png"
}
}
},
new Product {
Text = "21\"",
Items = new[] {
new Product {
Text = "DesktopLCD 21",
Price = 170,
Image = "../../images/ProductsLarge/12.png"
},
new Product {
Text = "DesktopLED 21",
Price = 175,
Image = "../../images/ProductsLarge/13.png"
}
}
}
}
},
new Product {
Text = "Projectors",
Items = new[] {
new Product {
Text = "Projector Plus",
Price = 550,
Image = "../../images/ProductsLarge/14.png"
},
new Product {
Text = "Projector PlusHD",
Price = 750,
Image = "../../images/ProductsLarge/15.png"
}
}
}
}
};
public static readonly Product Braeburn = new Product {
Text = "Braeburn",
Items = new[] {
new Product {
Text = "Video Players",
Items = new[] {
new Product {
Text = "HD Video Player",
Price = 240,
Image = "../../images/ProductsLarge/1.png"
},
new Product {
Text = "SuperHD Video Player",
Price = 300,
Image = "../../images/ProductsLarge/2.png"
}
}
},
new Product {
Text = "Televisions",
Items = new[] {
new Product {
Text = "SuperPlasma 50",
Price = 1800,
Image = "../../images/ProductsLarge/3.png"
},
new Product {
Text = "SuperPlasma 65",
Price = 3500,
Image = "../../images/ProductsLarge/8.png"
}
}
},
new Product {
Text = "Monitors",
Items = new[] {
new Product {
Text = "19\"",
Items = new[] {
new Product {
Text = "DesktopLCD 19",
Price = 170,
Image = "../../images/ProductsLarge/10.png"
}
}
},
new Product {
Text = "21\"",
Items = new[] {
new Product {
Text = "DesktopLCD 21",
Price = 180,
Image = "../../images/ProductsLarge/12.png"
},
new Product {
Text = "DesktopLED 21",
Price = 190,
Image = "../../images/ProductsLarge/13.png"
}
}
}
}
}
}
};
public static readonly Product EMart = new Product {
Text = "E-Mart",
Items = new[] {
new Product {
Text = "Video Players",
Items = new[] {
new Product {
Text = "HD Video Player",
Price = 220,
Image = "../../images/ProductsLarge/1.png"
},
new Product {
Text = "SuperHD Video Player",
Price = 275,
Image = "../../images/ProductsLarge/2.png"
}
}
},
new Product {
Text = "Monitors",
Items = new[] {
new Product {
Text = "19\"",
Items = new[] {
new Product {
Text = "DesktopLCD 19",
Price = 165,
Image = "../../images/ProductsLarge/10.png"
}
}
},
new Product {
Text = "21\"",
Items = new[] {
new Product {
Text = "DesktopLCD 21",
Price = 175,
Image = "../../images/ProductsLarge/12.png"
}
}
}
}
}
}
};
public static readonly Product Walters = new Product {
Text = "Walters",
Items = new[] {
new Product {
Text = "Video Players",
Items = new[] {
new Product {
Text = "HD Video Player",
Price = 210,
Image = "../../images/ProductsLarge/1.png"
},
new Product {
Text = "SuperHD Video Player",
Price = 250,
Image = "../../images/ProductsLarge/2.png"
}
}
},
new Product {
Text = "Televisions",
Items = new[] {
new Product {
Text = "SuperLCD 42",
Price = 1100,
Image = "../../images/ProductsLarge/7.png"
},
new Product {
Text = "SuperLED 42",
Price = 1400,
Image = "../../images/ProductsLarge/5.png"
},
new Product {
Text = "SuperLED 50",
Price = 1500,
Image = "../../images/ProductsLarge/4.png"
},
new Product {
Text = "SuperLCD 55",
Price = 1300,
Image = "../../images/ProductsLarge/6.png"
},
new Product {
Text = "SuperLCD 70",
Price = 4000,
Image = "../../images/ProductsLarge/9.png"
},
new Product {
Text = "SuperPlasma 50",
Price = 1700,
Image = "../../images/ProductsLarge/3.png"
}
}
},
new Product {
Text = "Monitors",
Items = new[] {
new Product {
Text = "19\"",
Items = new[] {
new Product {
Text = "DesktopLCD 19",
Price = 160,
Image = "../../images/ProductsLarge/10.png"
}
}
},
new Product {
Text = "21\"",
Items = new[] {
new Product {
Text = "DesktopLCD 21",
Price = 170,
Image = "../../images/ProductsLarge/12.png"
},
new Product {
Text = "DesktopLED 21",
Price = 180,
Image = "../../images/ProductsLarge/13.png"
}
}
}
}
},
new Product {
Text = "Projectors",
Items = new[] {
new Product {
Text = "Projector Plus",
Price = 550,
Image = "../../images/ProductsLarge/14.png"
},
new Product {
Text = "Projector PlusHD",
Price = 750,
Image = "../../images/ProductsLarge/15.png"
}
}
}
}
};
public static readonly IEnumerable<Product> Products = new[] {
new Product {
Text = "Stores",
Expanded = true,
Items = new[] {
SuperMartOfTheWest,
Braeburn,
EMart,
Walters
}
}
};
}
}
#simple-treeview,
#product-details {
display: inline-block;
}
#product-details {
vertical-align: top;
width: 400px;
height: 420px;
margin-left: 20px;
}
#product-details > img {
border: none;
height: 300px;
width: 400px;
}
#product-details > .name {
text-align: center;
font-size: 20px;
}
#product-details > .price {
text-align: center;
font-size: 24px;
}
.dark #product-details > div {
color: #f0f0f0;
}
.hidden {
visibility: hidden;
}
Each object in the TreeView's hierarchical data structure should include the following fields:
You can respectively use the keyExpr, displayExpr, and itemsExpr properties to specify custom names for the above-mentioned fields. Node objects can also include developer-defined fields and properties from this help section: items[].
In this demo, nodes use the expanded property, which specifies whether a node is collapsed or expanded. They also include the developer-defined price and image fields.
To get started with the DevExtreme TreeView component, refer to the following tutorial for step-by-step instructions: Getting Started with TreeView.