grouping.md

title	page_title	description	slug	tags	published	position
Grouping	MultiSelect - Grouping	Grouping in the MultiSelect for Blazor.	components/multiselect/grouping	telerik,blazor,multiselect,group,grouping	true	15

MultiSelect Grouping

The MultiSelect component allows users to see the dropdown items grouped in categories. This can improve the user experience and make browsing through the items faster.

To enable MultiSelect grouping, set the GroupField parameter to a field name from the model. The MultiSelect will display the corresponding field values as group headers in the dropdown. Nested values of complex object properties are supported (see the example below).

The group headers can stick to the top of the dropdown during scrolling. In other words, users will always know which is the group of the current topmost items in the scrollable list.

caption Grouping in the MultiSelect

<TelerikMultiSelect Data="@Data"
                 @bind-Value="@SelectedProducts"
                 GroupField="Category.CategoryName"
                 TextField="ProductName"
                 ValueField="ProductId"
                 Placeholder="Select a product">
</TelerikMultiSelect>

@code {
    public IEnumerable<Product> Data { get; set; }
    public List<int> SelectedProducts { get; set; } = new List<int>();

    protected override void OnInitialized()
    {
        List<Product> products = new List<Product>();
        for (int i = 0; i < 20; i++)
        {
            products.Add(new Product()
            {
                ProductId = i,
                ProductName = $"Product {i}",
                Category = new Category() { CategoryId = i % 5, CategoryName = $"Category {i % 5}" }
            });
        }

        Data = products;

        base.OnInitialized();
    }

    public class Product
    {
        public int ProductId { get; set; }
        public string ProductName { get; set; }
        public Category Category { get; set; }
    }

    public class Category
    {
        public int CategoryId { get; set; }
        public string CategoryName { get; set; }
    }
}

Notes

• One level of grouping is supported.
• A grouped MultiSelect will provide a Groups property with a single GroupDescriptor in the DataSourceRequest argument of its [OnRead event]({%slug multiselect-events%}#onread). This will allow the developer to apply grouping with [manual data operations]({%slug components/grid/manual-operations%}).

See Also

• Live Demo: MultiSelect Grouping