Loading busy indicator in DropDownFooterView.

3 mins read

In Xamarin.Forms ComboBox, you can add the SfBusyIndicator when the data is being loaded with the help of DropDownHeaderView or DropDownFooterView. In the following example, the SfBusyIndicator has been loaded in the DropDownFooterView until the data is fetched.

Code snippets [Xaml]:

     <StackLayout Padding="10">
        <Label Text="ComboBox"/>
        <comboBox:SfComboBox x:Name="comboBox"
                             HeightRequest="45"
                             IsEditableMode="True"
                             SuggestionMode="Contains"
                             MaximumDropDownHeight="150"
                             ShowDropDownFooterView="True"
                             DropDownFooterViewHeight="60"
                             ValueChanged="comboBox_ValueChanged"
                             NoResultsFoundText="No Results" 
                             AllowFiltering="True"
                             DisplayMemberPath="Name">
 
            <comboBox:SfComboBox.DropDownFooterView>
                <Grid VerticalOptions="StartAndExpand"
                      HeightRequest="60"
                      BackgroundColor="#f0f0f0" >
                    <busyIndicator:SfBusyIndicator VerticalOptions="Start"
                                                   x:Name="busyindicator"
                                                   AnimationType="SlicedCircle"
                                                   ViewBoxWidth = "40"
                                                   ViewBoxHeight="40"
                                                   TextColor="Maroon"
                                                   IsBusy="True"/>
                </Grid>
            </comboBox:SfComboBox.DropDownFooterView>
 
        </comboBox:SfComboBox>
    </StackLayout>

Code snippets [C#]:

private async void DataChanged()
  {
            await Task.Delay(4000);
            busyindicator.IsBusy = false;
            comboBox.DropDownFooterViewHeight = 0;
            if (comboBox.DataSource == null)
            {
                LoadItems();
            }
        }
        private void comboBox_ValueChanged(object sender, Syncfusion.XForms.ComboBox.ValueChangedEventArgs e)
        {
            DataChanged();
        }

Output:

Loading BusyIndicator in DropDownFotterview of SfComboBox

Please use the sample link for the clarification.

Conclusion

I hope you enjoyed learning about how to loading busy indicator in DropDownFooterView.

You can refer to our Xamarin.Forms ComboBox feature tour page to know about its other groundbreaking feature representations. You can also explore our Xamarin.Forms ComboBox documentation to understand how to create and manipulate data.

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