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+---
+title: Combine a Default Filter Menu with a Checkbox List
+description: Learn how to create Excel-like filtering in Blazor Data Grid columns by combining operator-based filters and checkbox lists.
+type: how-to
+page_title: Combine a Default Filter Menu with a Checkbox List
+meta_title: Combine a Default Filter Menu with a Checkbox List
+slug: grid-kb-combine-filters-checkbox
+tags: grid, blazor, filter, menu, template, checkbox, list, excel
+res_type: kb
+ticketid: 1708346
+---
+
+## Environment
+
+
+
+
+
Product
+
Grid for Blazor
+
+
+
+
+## Description
+
+I want to enable "Excel-like" filtering in the Blazor Grid. Specifically, for each column, I want to combine operator-based filtering (e.g., contains or equals) with a checkbox list for selecting distinct values from the data source. By default, the Blazor Grid allows either the filter menu or the checkbox list, but not both simultaneously.
+
+## Solution
+
+To combine operator-based filters and checkbox lists in the same column, use the [`FilterMenuTemplate`](slug:grid-templates-filter#filter-menu-template) that allows you to customize the filter menu.
+
+````Razor
+@using Telerik.DataSource
+
+
+
+
+
+
+
+ @{
+ EnsureFilterDescriptors(context);
+ var fd0 = (FilterDescriptor)context.FilterDescriptor.FilterDescriptors[0];
+ var fd1 = (FilterDescriptor)context.FilterDescriptor.FilterDescriptors[1];
+ }
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+ @foreach (var size in Sizes)
+ {
+
+
+
+
+ }
+
+
+
+
+
+@code {
+ private List GridData { get; set; }
+ private string[] Sizes = new[] { "XS", "S", "M", "L", "XL", null };
+
+ private readonly List> FilterOperators =
+ Enum.GetValues(typeof(FilterOperator))
+ .Cast()
+ .Select(o => new DropDownItem
+ {
+ Text = o.ToString(),
+ Value = o
+ }).ToList();
+
+ private readonly List> LogicalOperators =
+ Enum.GetValues(typeof(FilterCompositionLogicalOperator))
+ .Cast()
+ .Select(o => new DropDownItem
+ {
+ Text = o.ToString(),
+ Value = o
+ }).ToList();
+
+ private void EnsureFilterDescriptors(FilterMenuTemplateContext context)
+ {
+ while (context.FilterDescriptor.FilterDescriptors.Count < 2)
+ {
+ context.FilterDescriptor.FilterDescriptors.Add(new FilterDescriptor());
+ }
+ }
+
+ private bool IsCheckboxInCurrentFilter(CompositeFilterDescriptor filterDescriptor, string size)
+ {
+ if (size == null)
+ {
+ return filterDescriptor.FilterDescriptors
+ .OfType()
+ .Any(fd => fd.Operator == FilterOperator.IsNull);
+ }
+
+ return filterDescriptor.FilterDescriptors
+ .OfType()
+ .Any(fd => fd.Value?.ToString() == size);
+ }
+
+ private void UpdateCheckedSizes(bool isChecked, string itemValue, FilterMenuTemplateContext context)
+ {
+ var composite = context.FilterDescriptor;
+ composite.LogicalOperator = FilterCompositionLogicalOperator.Or;
+
+ if (!isChecked)
+ {
+ var toRemove = composite.FilterDescriptors
+ .OfType()
+ .FirstOrDefault(fd =>
+ (fd.Operator == FilterOperator.IsNull && itemValue == null) ||
+ (fd.Operator == FilterOperator.IsEqualTo && fd.Value?.ToString() == itemValue));
+
+ if (toRemove != null)
+ {
+ composite.FilterDescriptors.Remove(toRemove);
+ }
+ }
+ else
+ {
+ composite.FilterDescriptors.Add(new FilterDescriptor
+ {
+ Member = nameof(Product.Size),
+ MemberType = typeof(string),
+ Operator = itemValue == null ? FilterOperator.IsNull : FilterOperator.IsEqualTo,
+ Value = itemValue
+ });
+ }
+ }
+
+ protected override void OnInitialized()
+ {
+ GridData = Enumerable.Range(1, 70).Select(x => new Product
+ {
+ Id = x,
+ Name = $"Product {x}",
+ Size = Sizes[x % Sizes.Length]
+ }).ToList();
+ }
+
+ public class Product
+ {
+ public int Id { get; set; }
+ public string Name { get; set; }
+ public string Size { get; set; }
+ }
+
+ public class DropDownItem
+ {
+ public string Text { get; set; }
+ public T Value { get; set; }
+ }
+}
+````
+
+## See Also
+
+* [Filter Menu Template Documentation](slug:grid-templates-filter#filter-menu-template)
+* [Filter Menu Documentation](slug:grid-filter-menu)
+* [CheckBoxList Filter Documentation](slug:grid-checklist-filter)