ToggleButton Events

This article explains the events available in the Telerik ToggleButton for Blazor:

• SelectedChanged
• OnClick

SelectedChanged

The SelectedChanged fires when the user changes the state of the button by clicking it (or by using Space or Enter). You can use it to call local view-model logic. To fetch data or perform async operations, use the OnClick event.

Handle the SelectedChanged event

@* If you do not update the view-model in the handler, you can effectively cancel the event *@

<TelerikToggleButton Selected="@IsSelected" SelectedChanged="@MySelectedChangedHandler">
    Selected: @IsSelected
</TelerikToggleButton>

@code {
    bool IsSelected { get; set; }

    void MySelectedChangedHandler(bool currSelectedState)
    {
        IsSelected = currSelectedState;
        //you have to update the model manually because handling the SelectedChanged event does not let you use @bind-Selected

        Console.WriteLine($"Current state is {IsSelected}");
    }
}

OnClick

The OnClick event fires when the user clicks or taps the button. You can use it to invoke async logic such as fetching data or calling a service.

Handle the Toggle Button OnClick event

@result
<br />

<TelerikToggleButton @bind-Selected="@IsSelected" OnClick="@ToggleButtonClickHandler">
    Selected: &nbsp; <strong>@IsSelected</strong>
</TelerikToggleButton>

@code {
    bool IsSelected { get; set; } = true;

    string result { get; set; }

    async Task ToggleButtonClickHandler()
    {
        await Task.Delay(500); // simulate a service call
        string currState = IsSelected ? "ON" : "OFF";
        result = $"The user clicked the {currState} state.";
    }
}

The event is an EventCallback and it can be synchronous (return void), or it can also be asynchronous and return async Task.

See Also

• ToggleButton Overview