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Backend API
@(Html.DevExtreme().TreeView()
.ID("treeview")
.DataSource(d => d.Mvc().LoadAction("GetHierarchicalDataForSearch"))
.DisplayExpr("Text")
.ItemsExpr("Items")
.ExpandedExpr("Expanded")
.Width(500)
.SearchEnabled(true)
)
<div class="options">
<div class="caption">Options</div>
<div class="option">
<span>Search mode</span>
@(Html.DevExtreme().SelectBox()
.ID("searchMode")
.DataSource(new[] { "contains", "startsWith", "equals" })
.Value("contains")
.InputAttr("aria-label", "Search Mode")
.OnValueChanged("selectBox_valueChanged")
)
</div>
</div>
<script>
function selectBox_valueChanged(e) {
$("#treeview").dxTreeView("option", "searchMode", e.value);
}
</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 TreeViewWithSearchBar() {
return View();
}
[HttpGet]
public object GetHierarchicalDataForSearch(DataSourceLoadOptions loadOptions) {
return DataSourceLoader.Load(TreeViewHierarchicalDataForSearch.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.Collections.Generic;
using System.Linq;
namespace DevExtreme.NETCore.Demos.Models.SampleData {
public static class TreeViewHierarchicalDataForSearch {
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 = "../../Content/Images/ProductsLarge/1.png"
},
new Product {
Text = "SuperHD Video Player",
Price = 270,
Image = "../../Content/Images/ProductsLarge/2.png"
}
}
},
new Product {
Text = "Televisions",
Items = new[] {
new Product {
Text = "SuperLCD 42",
Price = 1200,
Image = "../../Content/Images/ProductsLarge/7.png"
},
new Product {
Text = "SuperLED 42",
Price = 1450,
Image = "../../Content/Images/ProductsLarge/5.png"
},
new Product {
Text = "SuperLED 50",
Price = 1600,
Image = "../../Content/Images/ProductsLarge/4.png"
},
new Product {
Text = "SuperLCD 55",
Price = 1350,
Image = "../../Content/Images/ProductsLarge/6.png"
},
new Product {
Text = "SuperLCD 70",
Price = 4000,
Image = "../../Content/Images/ProductsLarge/9.png"
}
}
},
new Product {
Text = "Monitors",
Items = new[] {
new Product {
Text = "19\"",
Items = new[] {
new Product {
Text = "DesktopLCD 19",
Price = 160,
Image = "../../Content/Images/ProductsLarge/10.png"
}
}
},
new Product {
Text = "21\"",
Items = new[] {
new Product {
Text = "DesktopLCD 21",
Price = 170,
Image = "../../Content/Images/ProductsLarge/12.png"
},
new Product {
Text = "DesktopLED 21",
Price = 175,
Image = "../../Content/Images/ProductsLarge/13.png"
}
}
}
}
},
new Product {
Text = "Projectors",
Items = new[] {
new Product {
Text = "Projector Plus",
Price = 550,
Image = "../../Content/Images/ProductsLarge/14.png"
},
new Product {
Text = "Projector PlusHD",
Price = 750,
Image = "../../Content/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 = "../../Content/Images/ProductsLarge/1.png"
},
new Product {
Text = "SuperHD Video Player",
Price = 300,
Image = "../../Content/Images/ProductsLarge/2.png"
}
}
},
new Product {
Text = "Televisions",
Items = new[] {
new Product {
Text = "SuperPlasma 50",
Price = 1800,
Image = "../../Content/Images/ProductsLarge/3.png"
},
new Product {
Text = "SuperPlasma 65",
Price = 3500,
Image = "../../Content/Images/ProductsLarge/8.png"
}
}
},
new Product {
Text = "Monitors",
Items = new[] {
new Product {
Text = "19\"",
Items = new[] {
new Product {
Text = "DesktopLCD 19",
Price = 170,
Image = "../../Content/Images/ProductsLarge/10.png"
}
}
},
new Product {
Text = "21\"",
Items = new[] {
new Product {
Text = "DesktopLCD 21",
Price = 180,
Image = "../../Content/Images/ProductsLarge/12.png"
},
new Product {
Text = "DesktopLED 21",
Price = 190,
Image = "../../Content/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 = "../../Content/Images/ProductsLarge/1.png"
},
new Product {
Text = "SuperHD Video Player",
Price = 275,
Image = "../../Content/Images/ProductsLarge/2.png"
}
}
},
new Product {
Text = "Monitors",
Items = new[] {
new Product {
Text = "19\"",
Items = new[] {
new Product {
Text = "DesktopLCD 19",
Price = 165,
Image = "../../Content/Images/ProductsLarge/10.png"
}
}
},
new Product {
Text = "21\"",
Items = new[] {
new Product {
Text = "DesktopLCD 21",
Price = 175,
Image = "../../Content/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 = "../../Content/Images/ProductsLarge/1.png"
},
new Product {
Text = "SuperHD Video Player",
Price = 250,
Image = "../../Content/Images/ProductsLarge/2.png"
}
}
},
new Product {
Text = "Televisions",
Items = new[] {
new Product {
Text = "SuperLCD 42",
Price = 1100,
Image = "../../Content/Images/ProductsLarge/7.png"
},
new Product {
Text = "SuperLED 42",
Price = 1400,
Image = "../../Content/Images/ProductsLarge/5.png"
},
new Product {
Text = "SuperLED 50",
Price = 1500,
Image = "../../Content/Images/ProductsLarge/4.png"
},
new Product {
Text = "SuperLCD 55",
Price = 1300,
Image = "../../Content/Images/ProductsLarge/6.png"
},
new Product {
Text = "SuperLCD 70",
Price = 4000,
Image = "../../Content/Images/ProductsLarge/9.png"
},
new Product {
Text = "SuperPlasma 50",
Price = 1700,
Image = "../../Content/Images/ProductsLarge/3.png"
}
}
},
new Product {
Text = "Monitors",
Items = new[] {
new Product {
Text = "19\"",
Items = new[] {
new Product {
Text = "DesktopLCD 19",
Price = 160,
Image = "../../Content/Images/ProductsLarge/10.png"
}
}
},
new Product {
Text = "21\"",
Items = new[] {
new Product {
Text = "DesktopLCD 21",
Price = 170,
Image = "../../Content/Images/ProductsLarge/12.png"
},
new Product {
Text = "DesktopLED 21",
Price = 180,
Image = "../../Content/Images/ProductsLarge/13.png"
}
}
}
}
},
new Product {
Text = "Projectors",
Items = new[] {
new Product {
Text = "Projector Plus",
Price = 550,
Image = "../../Content/Images/ProductsLarge/14.png"
},
new Product {
Text = "Projector PlusHD",
Price = 750,
Image = "../../Content/Images/ProductsLarge/15.png"
}
}
}
}
};
public static readonly IEnumerable<Product> Products = new[] {
new Product {
Text = "Stores",
Expanded = true,
Items = new[] {
SuperMartOfTheWest,
Braeburn,
EMart,
Walters
}
}
};
}
}
#treeview {
height: 400px;
}
.options {
padding: 20px;
position: absolute;
bottom: 0;
right: 0;
width: 260px;
top: 0;
background-color: rgba(191, 191, 191, 0.15);
}
.caption {
font-size: 18px;
font-weight: 500;
}
.option {
margin-top: 10px;
}
.option > .dx-selectbox {
display: inline-block;
vertical-align: middle;
max-width: 350px;
width: 100%;
margin-top: 5px;
}
The TreeView uses the TextBox component as a search bar. To customize it, specify TextBox properties in the searchEditorOptions object.
We do not recommend that you enable search if the TreeView uses virtual mode or custom logic to load data on demand. In these cases, the TreeView may not have the full dataset, and the search results include only loaded nodes.