Commands

DatePicker Commands

Date Picker for Xamarin exposes the following commands you can use to programmatically manipulate displaying the popup as well as clearing the selected time:

• ToggleCommand(ICommand): Allows you to show/hide the popup used for selecting a date value.
• ClearCommand(ICommand): Allows you to clear the displayed date.

Example for ToggleCommand and ClearCommand

• XAML

<StackLayout>
    <Button Text="Toggle Command" Command="{Binding Source={x:Reference datePicker}, Path=ToggleCommand}"/>
    <Button Text="Clear Command" Command="{Binding Source={x:Reference datePicker}, Path=ClearCommand}"/>
    <telerikInput:RadDatePicker x:Name="datePicker" />
</StackLayout>

also you need to add the following namespace:

• XAML

xmlns:telerikInput="clr-namespace:Telerik.XamarinForms.Input;assembly=Telerik.XamarinForms.Input"

PopupSelector Commands

Through the popup users can pick a date. The date value should be confirmed or rejected through the OK and Cancel buttons placed on the popup.

DatePicker allows you to add a custom logic for the Accept and Cancel commands which are executed when OK and Cancel buttons, respectively, are pressed.

• AcceptCommand(ICommand): Defines the command which confirms the current selection of the picker and closes the popup. AcceptCommandParameter can be used to pass a parameter to the command execute method.
• CancelCommand(ICommand): Defines the command which rejects the current selection of the picker and closes the popup. CancelCommandParameter can be used to pass a parameter to the command execute method.

The Accept and Cancel commands can be applied using the SelectorSettings property of RadDatePicker. In addition, you can pass command parameters through the AcceptCommandParameter and CancelCommandParameter properties of the DatePicker SelectorSettings.

Here is a quick example on how they could be set:

Example for AcceptCommand and CancelCommand

• XAML

<telerikInput:RadDatePicker x:Name="datePicker">
    <telerikInput:RadDatePicker.SelectorSettings>
        <telerikInput:PickerPopupSelectorSettings AcceptCommand="{Binding Accept}" 
                                                  AcceptCommandParameter="{Binding Date, Source={x:Reference datePicker}}"
                                                  CancelCommand="{Binding Cancel}"
                                                  CancelCommandParameter="{Binding Date, Source={x:Reference datePicker}}"/>
        </telerikInput:RadDatePicker.SelectorSettings>
    <telerikInput:RadDatePicker.BindingContext>
        <local:ViewModel/>
    </telerikInput:RadDatePicker.BindingContext>
</telerikInput:RadDatePicker>

and the ViewModel

• C#

public class ViewModel
{
    public ICommand Accept { get; set; }
    public ICommand Cancel { get; set; }

    public ViewModel()
    {
        this.Accept = new Command(this.OnAccept);
        this.Cancel = new Command(this.OnCancel);
    }

    private void OnAccept(object param)
    {
        Application.Current.MainPage.DisplayAlert("Date selected", String.Format("New Date: {0:d}", (DateTime)param), "OK");
        // implement your custom logic here
    }

    private void OnCancel(object param)
    {
        var message = param != null ? String.Format("Current date: {0:d}", (DateTime)param) : "Currently no date is selected";
        Application.Current.MainPage.DisplayAlert("Date Selection Canceled", message, "OK");
        // implement your custom logic here
    }
}

also you need to add the following namespace:

• XAML

xmlns:telerikInput="clr-namespace:Telerik.XamarinForms.Input;assembly=Telerik.XamarinForms.Input"