Xamarin.Forms: How to diplay a modal when an item in ListView is clicked? - xaml

Question

Good Day everyone. I'm currently doing a simple application in Xamarin.Forms that allows me to CRUD record of an Employee. The created records are displayed on a ListView. Here's my screenshot.
What I want to do is whenever I click an Item on the ListView, is it will display a modal with a more detailed information of an Employee e.g (Birthday, Address, Gender, Work Experience). How can I do that? Is that even possible? Can you show me how?
This is my code that displays the ListView.
<?xml version="1.0" encoding="utf-8" ?>
<ContentPage xmlns="http://xamarin.com/schemas/2014/forms"
xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
x:Class="XamarinFormsDemo.EmployeeRecordsPage"
xmlns:ViewModels="clr-namespace:XamarinFormsDemo.ViewModels;assembly=XamarinFormsDemo"
xmlns:controls="clr-namespace:ImageCircle.Forms.Plugin.Abstractions;assembly=ImageCircle.Forms.Plugin.Abstractions"
BackgroundImage="bg3.jpg"
Title="List of Employees">
<ContentPage.BindingContext>
<ViewModels:MainViewModel/>
</ContentPage.BindingContext>
<StackLayout Orientation="Vertical">
<ListView ItemsSource="{Binding EmployeesList, Mode=TwoWay}"
HasUnevenRows="True">
<ListView.ItemTemplate>
<DataTemplate>
<ViewCell>
<Grid Padding="10" RowSpacing="10" ColumnSpacing="5">
<Grid.RowDefinitions>
<RowDefinition Height="Auto"/>
<RowDefinition Height="*"/>
</Grid.RowDefinitions>
<Grid.ColumnDefinitions>
<ColumnDefinition Width="Auto"/>
<ColumnDefinition Width="*"/>
</Grid.ColumnDefinitions>
<controls:CircleImage Source="icon.png"
HeightRequest="66"
HorizontalOptions="CenterAndExpand"
Aspect="AspectFill"
WidthRequest="66"
Grid.RowSpan="2"
/>
<Label Grid.Column="1"
Text="{Binding Name}"
TextColor="#24e97d"
FontSize="24"/>
<Label Grid.Column="1"
Grid.Row="1"
Text="{Binding Department}"
TextColor="White"
FontSize="18"
Opacity="0.6"/>
</ViewCell>
</DataTemplate>
</ListView.ItemTemplate>
</ListView>
<StackLayout Orientation="Vertical"
Padding="30,10,30,10"
HeightRequest="20"
BackgroundColor="#24e97d"
VerticalOptions="Center"
Opacity="0.5">
<Label Text="© Copyright 2015 smesoft.com.ph All Rights Reserved "
HorizontalTextAlignment="Center"
VerticalOptions="Center"
HorizontalOptions="Center" />
</StackLayout>
</StackLayout>
</ContentPage>
NOTE: Records that are displayed are CREATED in ASP.NET Web Application and just displayed on a ListView in UWP. If you need to see more codes, just please let me know.
Thanks a lot Guys.

Answer 1

To bind a command to item selected property see the example bellow otherwise ItemSelected will bind to a model property only
For full example see https://github.com/TheRealAdamKemp/Xamarin.Forms-Tests/blob/master/RssTest/View/Pages/MainPage.xaml.cs
Now you can bind an Icommand which could have something like
private Command login;
public ICommand Login
{
get
{
login = login ?? new Command(DoLogin);
return login;
}
}
private async void DoLogin()
{
await Navigation.PopModalAsync(new MySampXamlPage());
//await DisplayAlert("Hai", "thats r8", "ok");
}
and view :
[Navigation.RegisterViewModel(typeof(RssTest.ViewModel.Pages.MainPageViewModel))]
public partial class MainPage : ContentPage
{
public const string ItemSelectedCommandPropertyName = "ItemSelectedCommand";
public static BindableProperty ItemSelectedCommandProperty = BindableProperty.Create(
propertyName: "ItemSelectedCommand",
returnType: typeof(ICommand),
declaringType: typeof(MainPage),
defaultValue: null);
public ICommand ItemSelectedCommand
{
get { return (ICommand)GetValue(ItemSelectedCommandProperty); }
set { SetValue(ItemSelectedCommandProperty, value); }
}
public MainPage ()
{
InitializeComponent();
}
protected override void OnBindingContextChanged()
{
base.OnBindingContextChanged();
RemoveBinding(ItemSelectedCommandProperty);
SetBinding(ItemSelectedCommandProperty, new Binding(ItemSelectedCommandPropertyName));
}
protected override void OnAppearing()
{
base.OnAppearing();
_listView.SelectedItem = null;
}
private void HandleItemSelected(object sender, SelectedItemChangedEventArgs e)
{
if (e.SelectedItem == null)
{
return;
}
var command = ItemSelectedCommand;
if (command != null && command.CanExecute(e.SelectedItem))
{
command.Execute(e.SelectedItem);
}
}
}
XAML:
<?xml version="1.0" encoding="UTF-8"?>
<ContentPage
xmlns="http://xamarin.com/schemas/2014/forms"
xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
xmlns:ValueConverters="clr-namespace:RssTest.ValueConverters;assembly=RssTest"
x:Class="RssTest.View.Pages.MainPage"
Title="{Binding Title}">
<ContentPage.Resources>
<ResourceDictionary>
<ValueConverters:BooleanNegationConverter x:Key="not" />
</ResourceDictionary>
</ContentPage.Resources>
<Grid VerticalOptions="FillAndExpand" HorizontalOptions="FillAndExpand">
<ListView x:Name="_listView"
IsVisible="{Binding IsLoading, Converter={StaticResource not}" ItemsSource="{Binding Items}"
ItemSelected="HandleItemSelected"
VerticalOptions="FillAndExpand" HorizontalOptions="FillAndExpand">
<ListView.ItemTemplate>
<DataTemplate>
<TextCell Text="{Binding Title}" />
</DataTemplate>
</ListView.ItemTemplate>
</ListView>
<ActivityIndicator IsVisible="{Binding IsLoading}" IsRunning="{Binding IsLoading}"
VerticalOptions="FillAndExpand" HorizontalOptions="FillAndExpand" />
</Grid>
</ContentPage>