CODEWITHSUNDEEP
c#xamarin.formscustom-renderer
Daprin Wakaliana
Daprin Wakaliana

Reputation: 185

Xamarin Form trigger SearchCommand in SearchBar on empty string

I am using a SearchBar on XamarinForm, the problem is whenever the searchbar is empty and I press the search button, the SearchCommand won't be triggered.

I tried using custom renderer on this link from xamarin forum but It does not work.

public class CustomSearchBarRenderer : SearchBarRenderer
{
    protected override void OnElementChanged(ElementChangedEventArgs<SearchBar> e)
    {
        base.OnElementChanged(e);
        if (e.OldElement == null)
        {
            this.Control.QueryTextSubmit += (sender, args) =>
            {
                if (string.IsNullOrEmpty(args.Query) && Element.SearchCommand != null)
                    Element.SearchCommand.Execute(null);
            };
        }
    }
}

please help me

Upvotes: 5

Views: 2948

Answers (1)

carolina lopez
carolina lopez

Reputation: 61

In MVVM use behaviors. In XAML:

<SearchBar x:Name="SearchBarVehicles" SearchCommand="{Binding SearchCommand}" Text="{Binding SearchText.Value, Mode=TwoWay}"    SearchCommandParameter="{Binding Text, Source={x:Reference SearchBarVehicles}}" >
    <SearchBar.Behaviors>
        <behaviors:EventToCommandBehavior
            EventName="TextChanged"
            Command="{Binding TextChangeInSearchCommand}"
            />
    </SearchBar.Behaviors>
</SearchBar>

In your class:

public ICommand TextChangeInSearchCommand => new Command(() => SearchInBlank());
private async void SearchInBlank()
{

    if (string.IsNullOrWhiteSpace(SearchText.Value))
    {
        //Your search in blank.
    }

}

Upvotes: 6

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