Filtering in Blazor AutoComplete Component

8 Aug 202311 minutes to read

The AutoComplete has built-in support to filter data items. The filter operation starts as soon as you start typing characters in the component.

Change the filter type

Determines on which filter type the component needs to be considered on search action. The available FilterType and its supported data types are:

Filter Type	Description	Supported Types
StartsWith	Checks whether a value begins with the specified value.	String
EndsWith	Checks whether a value ends with specified value.	String
Contains	Checks whether a value contains with specified value.	String

The following examples shows data filtering is done with the StartsWith type.

@using Syncfusion.Blazor.Data
@using Syncfusion.Blazor.DropDowns

<SfAutoComplete TValue="string" TItem="OrderDetails"  Placeholder="Select a customerID" Query="@RemoteDataQuery" FilterType="Syncfusion.Blazor.DropDowns.FilterType.StartsWith">
    <SfDataManager Url="https://js.syncfusion.com/demos/ejServices/Wcf/Northwind.svc/Orders" Adaptor="Adaptors.ODataAdaptor" CrossDomain=true></SfDataManager>
    <AutoCompleteFieldSettings  Value="CustomerID"></AutoCompleteFieldSettings>
</SfAutoComplete>

@code {
    public Query RemoteDataQuery = new Query().Select(new List<string> { "CustomerID" }).Take(6).RequiresCount();
    public class OrderDetails
    {
        public int? OrderID { get; set; }
        public string CustomerID { get; set; }
        public int? EmployeeID { get; set; }
        public double? Freight { get; set; }
        public string ShipCity { get; set; }
        public bool Verified { get; set; }
        public DateTime? OrderDate { get; set; }
        public string ShipName { get; set; }
        public string ShipCountry { get; set; }
        public DateTime? ShippedDate { get; set; }
        public string ShipAddress { get; set; }
    }
}

Filter item count

You can specify the filter suggestion item count using the SuggestionCount property of AutoComplete.

Refer to the following example to restrict the suggestion list item counts as 3.

@using Syncfusion.Blazor.Data

<SfAutoComplete TValue="string" TItem="OrderDetails"  Placeholder="Select a customerID" SuggestionCount=3 Query="@RemoteDataQuery" FilterType="Syncfusion.Blazor.DropDowns.FilterType.StartsWith">
    <SfDataManager Url="https://js.syncfusion.com/demos/ejServices/Wcf/Northwind.svc/Orders" Adaptor="Adaptors.ODataAdaptor" CrossDomain=true></SfDataManager>
    <AutoCompleteFieldSettings  Value="CustomerID"></AutoCompleteFieldSettings>
</SfAutoComplete>

@code {

    public Query RemoteDataQuery = new Query().Select(new List<string> { "CustomerID" }).RequiresCount();
    public class OrderDetails
    {
        public int? OrderID { get; set; }
        public string CustomerID { get; set; }
        public int? EmployeeID { get; set; }
        public double? Freight { get; set; }
        public string ShipCity { get; set; }
        public bool Verified { get; set; }
        public DateTime? OrderDate { get; set; }
        public string ShipName { get; set; }
        public string ShipCountry { get; set; }
        public DateTime? ShippedDate { get; set; }
        public string ShipAddress { get; set; }
    }
}

Limit the minimum filter character

You can set the limit for the character count to filter the data on the AutoComplete. This can be done by setting the MinLength property to AutoComplete.

In the following example, the remote request doesn’t fetch the search data until the search key contains three characters.

@using Syncfusion.Blazor.Data
@using Syncfusion.Blazor.DropDowns

<SfAutoComplete TValue="string" TItem="OrderDetails"  Placeholder="Select a customerID" MinLength=3 Query="@RemoteDataQuery" FilterType="Syncfusion.Blazor.DropDowns.FilterType.StartsWith">
    <SfDataManager Url="https://js.syncfusion.com/demos/ejServices/Wcf/Northwind.svc/Orders" Adaptor="Adaptors.ODataAdaptor" CrossDomain=true></SfDataManager>
    <AutoCompleteFieldSettings Value="CustomerID"></AutoCompleteFieldSettings>
</SfAutoComplete>

@code {
    public Query RemoteDataQuery = new Query().Select(new List<string> { "CustomerID" }).RequiresCount();
    public class OrderDetails
    {
        public int? OrderID { get; set; }
        public string CustomerID { get; set; }
        public int? EmployeeID { get; set; }
        public double? Freight { get; set; }
        public string ShipCity { get; set; }
        public bool Verified { get; set; }
        public DateTime? OrderDate { get; set; }
        public string ShipName { get; set; }
        public string ShipCountry { get; set; }
        public DateTime? ShippedDate { get; set; }
        public string ShipAddress { get; set; }
    }
}

Case sensitive filtering

Data items can be filtered either with or without case sensitivity using the DataManager. This can be done by setting the IgnoreCase property of AutoComplete.

The following sample depicts how to filter the data with case-sensitive.

@using Syncfusion.Blazor.Data
@using Syncfusion.Blazor.DropDowns

<SfAutoComplete TValue="string" TItem="Country" Placeholder="Select a country" IgnoreCase=false DataSource="@LocalData">
    <AutoCompleteFieldSettings Value="Name"></AutoCompleteFieldSettings>
</SfAutoComplete>

@code {

    public class Country
    {
        public string Name { get; set; }
        public string Code { get; set; }
    }

    List<Country> LocalData = new List<Country> {
        new Country() { Name = "Australia", Code = "AU" },
        new Country() { Name = "Bermuda", Code = "BM" },
        new Country() { Name = "Canada", Code = "CA" },
        new Country() { Name = "Cameroon", Code = "CM" },
        new Country() { Name = "Denmark", Code = "DK" },
        new Country() { Name = "France", Code = "FR" },
        new Country() { Name = "Finland", Code = "FI" },
        new Country() { Name = "Germany", Code = "DE" },
        new Country() { Name = "Greenland", Code = "GL" },
        new Country() { Name = "Hong Kong", Code = "HK" },
    };
}

Custom filtering

The AutoComplete component filter queries can be customized. You can also use your own filter libraries to filter data like Fuzzy search.

@using Syncfusion.Blazor.Data

<SfAutoComplete TValue="string" @ref="autoObj" TItem="Country" Placeholder="e.g. Australia" AllowFiltering="true">
    <AutoCompleteFieldSettings Text="Name" Value="Code"></AutoCompleteFieldSettings>
    <AutoCompleteEvents TValue="string" TItem="Country" Filtering="OnFilter"></AutoCompleteEvents>
</SfAutoComplete>

@code {

    SfAutoComplete<string, Country> autoObj { get; set; }

    public class Country
    {
        public string Name { get; set; }

        public string Code { get; set; }
    }

    List<Country> Country = new List<Country>
    {
        new Country() { Name = "Australia", Code = "AU" },
        new Country() { Name = "Bermuda", Code = "BM" },
        new Country() { Name = "Canada", Code = "CA" },
        new Country() { Name = "Cameroon", Code = "CM" },
        new Country() { Name = "Denmark", Code = "DK" }
    };

    private async Task OnFilter(FilteringEventArgs args)
    {
        args.PreventDefaultAction = true;
        var query = new Query().Where(new WhereFilter() { Field = "Name", Operator = "contains", value = args.Text, IgnoreCase = true });

        query = !string.IsNullOrEmpty(args.Text) ? query : new Query();

        await autoObj.FilterAsync(Country, query);
    }
}

Highlighting Search character

Highlighting Search character using property

You can highlight the search text in the suggested list items of the autocomplete component by using the Highlight property. When set to true, it will highlight the characters that match the search query in the list items.

RAZOR

@using Syncfusion.Blazor.DropDowns;

<SfAutoComplete TValue="string" TItem="Country" Placeholder="e.g. Australia" DataSource="@LocalData" Highlight="@Highlight">
    <AutoCompleteFieldSettings Value="Name" />
</SfAutoComplete>

@code {

    public class Country
    {
        public string Name { get; set; }
        public string Code { get; set; }
    }

    List<Country> LocalData = new List<Country> {
        new Country() { Name = "Australia", Code = "AU" },
        new Country() { Name = "Bermuda", Code = "BM" },
        new Country() { Name = "Canada", Code = "CA" },
        new Country() { Name = "Cameroon", Code = "CM" },
        new Country() { Name = "Denmark", Code = "DK" }
    };

    public bool Highlight { get; set; } = true;
}

Highlighting Search character using method

You can highlight the search text in the suggested list items of the autocomplete component by using the HighLightSearch method. It accepts several arguments, including textValue, ignoreCase, filtertype and highLighText. When called, it will highlight the characters that match the search query in the list items.”

• textValue - The text to be highlighted in the list item.
• ignoreCase - A boolean value which when set to true performs the search text based on casing.
• filterType - Determines on which filter type the highlight text is updated on the text.
• highlightText - The text to be highlighted. This is an optional argument. If not provided, it will use the filter value as the highlight text.”

RAZOR

@using Syncfusion.Blazor.DropDowns;

<SfAutoComplete @ref="@AutoCompleteObj" TValue="string" TItem="Country" Placeholder="e.g. Australia" DataSource="@LocalData">
    <AutoCompleteFieldSettings Value="Name" />
       <AutoCompleteTemplates TItem="Country">

        <ItemTemplate Context="icontext">

            <div class="samplename"> @((MarkupString)AutoCompleteObj.HighLightSearch(icontext.Name, true, Syncfusion.Blazor.DropDowns.FilterType.Contains))</div>

        </ItemTemplate>

    </AutoCompleteTemplates>
</SfAutoComplete>

@code {
    SfAutoComplete<string, Country> AutoCompleteObj;

    public class Country
    {
        public string Name { get; set; }
        public string Code { get; set; }
    }

    List<Country> LocalData = new List<Country> {
        new Country() { Name = "Australia", Code = "AU" },
        new Country() { Name = "Bermuda", Code = "BM" },
        new Country() { Name = "Canada", Code = "CA" },
        new Country() { Name = "Cameroon", Code = "CM" },
        new Country() { Name = "Denmark", Code = "DK" }
    };

}