Multiple selection in Xamarin.Android SfComboBox

17 Jan 20255 minutes to read

Select multiple items from a suggestion list. In the combo box, you can perform multi selection in the following two ways:

• Token representation

• Delimiter

NOTE

The default mode of multiple selection is None.

Token representation

Selected items will be displayed with a customizable token representation, and the users can remove each tokenized item with the close button.

C#

comboBox.MultiSelectMode = MultiSelectMode.Token;
comboBox.TokensWrapMode = TokensWrapMode.Wrap;
comboBox.IsSelectedItemsVisibleInDropDown = false;

Wrap mode of token

The selected item can be displayed as token inside the combo box in two ways. They are,

• Wrap - When TokensWrapMode is set to Wrap ,the selected items will be wrapped to the next line of the SfComboBox.

• None - When TokensWrapMode is set to None, the selected item will be wrapped in horizontal orientation.

C#

// Create a Employee Class Which holds the Name and Image
public class Employee
{
private string image;
public string Image
{
    get { return image; }
    set { image = value; }
}

private string name;
public string Name
{
    get { return name; }
    set { name = value; }
}
}

// Create EmployeeViewModel class holds the Collection of employee date
public class EmployeeViewModel : INotifyPropertyChanged
{
private ObservableCollection<Employee> employeeCollection;
public ObservableCollection<Employee> EmployeeCollection
{
    get { return employeeCollection; }
    set { employeeCollection = value; }
}
public EmployeeViewModel()
{
    employeeCollection = new ObservableCollection<Employee>();
    employeeCollection.Add(new Employee() { Image ="Frank.png", Name = "Frank" });
    employeeCollection.Add(new Employee() { Image = "James.png", Name = "James" });
    employeeCollection.Add(new Employee() { Image = "Steve.png", Name = "Steve" });
    employeeCollection.Add(new Employee() { Image = "Lucas.png", Name = "Lucas" });
    employeeCollection.Add(new Employee() { Image = "Mark.png", Name = "Mark" });
}

public event PropertyChangedEventHandler PropertyChanged;
private void RaisePropertyChanged(String name)
{
    if (PropertyChanged != null)
        this.PropertyChanged(this, new PropertyChangedEventArgs(name));
}
}

Setting ImageMemberPath

The combo box control is populated with the list of employees. But, the Employee model contains two properties: Image and Name. So, you should intimate by which property it should filter suggestions. The DisplayMemberPath and ImageMemberPath properties specify the property path with which filtering is done on business objects.

C#

comboBox.DisplayMemberPath = "Name";
comboBox.ImageMemberPath = "Image";

Token customization

Token can be customized in the following ways:

• TextColor - sets the color of the text inside the token.

• FontSize - sets the size of the font inside the token.

• FontFamily - sets the font family for the text inside the token.

• BackgroundColor - sets the background color of the token.

• SelectedBackgroundColor - sets the background color of the token when it is selected.

• IsCloseButtonVisible - Enables and disables the close button inside the SfComboBox.

• DeleteButtonColor - sets the color of the close button inside the SfComboBox.

• CornerRadius - sets the corner radius for the token.

C#

//Create an object to do Token Customization 
TokenSettings token = new TokenSettings();
token.BackgroundColor = Color.ParseColor("#f49e42");
token.TextSize = 16;
token.TextColor = Color.White;
token.SelectedBackgroundColor = Color.ParseColor("#ffffe0");
token.DeleteButtonColor = Color.Brown;
token.IsCloseButtonVisible = true;
token.CornerRadius = 15;
comboBox.TokenSettings = token;

Delimiter

When selecting the multiple items, the selected items can be divided with a desired character given for delimiter. The delimiter character can be set using the Delimiter property.

NOTE

The Default Delimiter Character is “,”.

C#

//Set the MultiSelectMode
comboBox.MultiSelectMode = MultiSelectMode.Delimiter;

We can add the custom delimiter character by Delimiter property.

C#

//Set the MultiSelectMode
comboBox.MultiSelectMode = MultiSelectMode.Delimiter;
comboBox.Delimiter = '#';