Filter Fields Operators

The Filter provides options for defining which filter operators will be displayed in the filtering dropdown.

The Operators parameter takes a literal with the available operators for each field type. You can list the desired operators and customize their text.

Supported Fields Operators

Read about the supported Filter Fields Operators...

To configure a Field Operators:

1. Provide list of <FilterListOperator> for every Field.

@using Telerik.DataSource;
@using Telerik.DataSource.Extensions;

<TelerikFilter @bind-Value="@Value">
    <FilterFields>
        <FilterField Name="@(nameof(Person.Name))" Type="@(typeof(string))" Label="First Name" Operators="@TextOperators"></FilterField>
        <FilterField Name="@(nameof(Person.AgeInYears))" Type="@(typeof(int))" Label="Age" Operators="@NumericOperators"></FilterField>
        <FilterField Name="@(nameof(Person.IsOutOfOffice))" Type="@(typeof(bool))" Label="Out Of Office" Operators="@BooleanOperators"></FilterField>
    </FilterFields>
</TelerikFilter>

@code {
    public CompositeFilterDescriptor Value { get; set; } = new CompositeFilterDescriptor();

    public List<FilterListOperator> TextOperators = new List<FilterListOperator>
    {
        new FilterListOperator { Operator = FilterOperator.StartsWith, Text = "custom starts with" },
        new FilterListOperator { Operator = FilterOperator.EndsWith, Text = "custom ends with" },
    };

    public List<FilterListOperator> NumericOperators = new List<FilterListOperator>
    {
        new FilterListOperator { Operator = FilterOperator.IsEqualTo, Text = "custom equal to" },
        new FilterListOperator { Operator = FilterOperator.IsLessThan, Text = "custom less than" },
        new FilterListOperator { Operator = FilterOperator.IsGreaterThan, Text = "custom greater than" },
    };

    public List<FilterListOperator> BooleanOperators = new List<FilterListOperator>
    {
        new FilterListOperator { Operator = FilterOperator.IsEqualTo, Text = "custom equal to" }
    };

    public class Person
    {
        public int EmployeeId { get; set; }

        public string Name { get; set; }

        public int AgeInYears { get; set; }

        public bool IsOutOfOffice { get; set; }

        public DateTime HireDate { get; set; }
    }
}