DxComboBox<TData, TValue>.DropDownWidthMode Property

Specifies the width of the drop-down list.

Namespace: DevExpress.Blazor

Assembly: DevExpress.Blazor.v23.2.dll

NuGet Package: DevExpress.Blazor

Declaration

[DefaultValue(DropDownWidthMode.ContentOrEditorWidth)]
[Parameter]
public DropDownWidthMode DropDownWidthMode { get; set; }

Property Value

Type	Default	Description
DropDownWidthMode	ContentOrEditorWidth	A DropDownWidthMode enumeration value.

Available values:

Name	Description
ContentOrEditorWidth	The list displays item text completely. The minimum list width matches the editor.
ContentWidth	The list width is equal to the width of the longest list item.
EditorWidth	The list width matches the editor. List items are cut if they do not fit.

Remarks

Use the DropDownWidthMode property to specify the width of the drop-down list. The following values are available:

• ContentOrEditorWidth (Default) - The list displays item text completely. The minimum list width matches the editor.

  

• ContentWidth - The list width is equal to the width of the longest list item.

  

• EditorWidth - The list width matches the editor. List items are cut if they do not fit.

  

Note

When the ComboBox renders items on demand (ListRenderMode is set to Virtual), the list width can change while users scroll items.

The following code sets the width of the drop-down list to the editor width.

Razor

@using BlazorApp.Data

<DxComboBox Data="@Staff.DataSource"
            @bind-Value="@Value"
            TextFieldName="@nameof(Person.Text)"
            DropDownWidthMode="DropDownWidthMode.EditorWidth">
</DxComboBox>

@code {
  Person Value { get; set; } = Staff.DataSource[0];
}

Person

namespace BlazorApp.Data {
    public class Person {
        public int Id { get; set; }
        public string FirstName { get; set; }
        public string LastName { get; set; }
        public Department Department { get; set; }
        public string Text => $"{FirstName} {LastName} ({Department} Dept.)";
    }

    public enum Department { Motors, Electronics, Software }

    public override bool Equals(object obj) {
        if (obj is Person typedObj) {
            return (this.Id == typedObj.Id) && (this.FirstName == typedObj.FirstName) && (this.LastName == typedObj.LastName) 
            && (this.Department == typedObj.Department);
        }
        return base.Equals(obj);
    }
}

Staff

using System;
using System.Collections.Generic;

namespace BlazorApp.Data {
    public static class Staff {
        private static readonly Lazy<List<Person>> dataSource = new Lazy<List<Person>>(() => {
            var dataSource = new List<Person>() {
                new Person() { Id= 0 , FirstName="John", LastName="Heart", Department=Department.Electronics },
                new Person() { Id= 1 , FirstName="Samantha", LastName="Bright", Department=Department.Motors },
                new Person() { Id= 2 , FirstName="Arthur", LastName="Miller", Department=Department.Software },
                new Person() { Id= 3 , FirstName="Robert", LastName="Reagan", Department=Department.Electronics },
                new Person() { Id= 4 , FirstName="Greta", LastName="Sims", Department=Department.Motors },
                new Person() { Id= 5 , FirstName="Brett", LastName="Wade", Department=Department.Software },
                new Person() { Id= 6 , FirstName="Sandra", LastName="Johnson", Department=Department.Electronics },
                new Person() { Id= 7 , FirstName="Edward", LastName="Holmes", Department=Department.Motors },
                new Person() { Id= 8 , FirstName="Barbara", LastName="Banks", Department=Department.Software },
                new Person() { Id= 9 , FirstName="Kevin", LastName="Carter", Department=Department.Electronics },
                new Person() { Id= 10, FirstName="Cynthia", LastName="Stanwick", Department=Department.Motors },
                new Person() { Id= 11, FirstName="Sam", LastName="Hill", Department=Department.Electronics }};
            return dataSource;
        });
        public static List<Person> DataSource { get { return dataSource.Value; } }
    }
}

Run Demo: ComboBox – Drop-Down List Width