DxTreeView.FilterStringChanged Event

Fires when a component’s filter string changes.

Assembly : DevExpress.Blazor.v25.2.dll

Declaration

csharp

[Parameter]
public EventCallback<string> FilterStringChanged { get; set; }

Parameters

Type	Description
String

The new FilterString property value.

Remarks

The FilterStringChanged event allows you to handle changes to the FilterString property value.

In the following example, an error message appears if a user types less than 4 characters in the search panel:

razor

<DxTreeView @ref="@treeView"
            ShowFilterPanel="true"
            FilterStringChanged=@OnFilterStringChanged
            FilterMinLength="4"
            FilterMode="NavigationFilterMode.Nodes"
            CssClass="cw-480"
            Data="@DataSource"
            LoadChildNodesOnDemand="true">
    <DataMappings>
        <DxTreeViewDataMapping HasChildren="HasSubGroups"
                               Children="SubGroups"
                               Text="Title" />
    </DataMappings>
</DxTreeView>

@Message

@code {
    string Message = "";
    void OnFilterStringChanged(string NewString) {
        if (NewString.Length < 4)
            Message = "You need to enter at least 4 characters to apply the filter";
        else
            Message = "";
    }
    @* ... *@
}