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Go to docs.umbraco.com/umbraco-cms/fundamentals/backoffice/property-editors/built-in-umbraco-property-editors/dropdown for documentation for Umbraco 9 and newer versions.

    Dropdown

    Alias: Umbraco.DropDown.Flexible

    Returns: String or IEnumerable<string>

    Displays a list of preset values. Either a single value or multiple values (formatted as a collection of strings) can be returned.

    Settings

    Enable multiple choice

    If enabled, editors will be able to select multiple values from the dropdown otherwise only a single value can be selected.

    Prevalues

    Prevalues are the options which are shown in the dropdown list. You can add, edit, or remove values here.

    Data Type Definition Example

    Dropdown Data Type Definition

    Content Example

    Single Value

    Single dropdown content example

    Multiple Values

    Multiple dropdown content example

    MVC View Example

    Single item - without Modelsbuilder

    @if (Model.HasValue("category"))
{
    <p>@(Model.Value<string>("category"))</p>
}

    Multiple items - without Modelsbuilder

    @if (Model.HasValue("categories"))
{
    var categories = Model.Value<IEnumerable<string>>("categories");
    <ul>
        @foreach (var category in categories)
        {
            <li>@category</li>
        }
    </ul>
}

    Single item - with Modelsbuilder

    @if (!Model.HasValue(Model.Category))
{
   <p>@Model.Category</p>
}

    Multiple items - with Modelsbuilder

    @if (Model.Categories.Any())
{
    <ul>
        @foreach (var category in Model.Categories)
        {
            <li>@category</li>
        }
    </ul>
}

    Add values programmatically

    See the example below to see how a value can be added or changed programmatically. To update a value of a property editor you need the Content Service.

    @using Newtonsoft.Json
@{
    // Get access to ContentService
    var contentService = Services.ContentService;

    // Create a variable for the GUID of the page you want to update
    var guid = Guid.Parse("32e60db4-1283-4caa-9645-f2153f9888ef");

    // Get the page using the GUID you've defined
    var content = contentService.GetById(guid); // ID of your page

    // Set the value of the property with alias 'categories'. 
    content.SetValue("categories", JsonConvert.SerializeObject(new[] { "News" }));

    // Save the change
    contentService.Save(content);
}

    Although the use of a GUID is preferable, you can also use the numeric ID to get the page:

    @{
    // Get the page using it's id
    var content = contentService.GetById(1234); 
}

    If Modelsbuilder is enabled you can get the alias of the desired property without using a magic string:

    @{
    // Set the value of the property with alias 'categories'
    content.SetValue(Home.GetModelPropertyType(x => x.Categories).Alias, JsonConvert.SerializeObject(new[] { "News" }));
}