My problem is I want to insert datepicker's value to firebase but Idk how to do it.
I already made an custom date picker but the use of it is to make an placeholder "birth date"
This is my xaml;
<frame //some property here>
<stacklayout //some property here>
<frame //some property here>
<image //some property here/>
<grid>
<local:BirthdayDatePickerControl x:Name="entryField_DateOfBirth" >
</local:BirthdayDatePickerControl >
</grid>
</frame>
</stacklayout>
</frame>
This is my code(Myproj):
Datepickerctrl.cs
public class DatePickerCtrl:DatePicker
{
public static readonly BindableProperty EnterTextProperty = BindableProperty.Create(propertyName: "Placeholder", returnType: typeof(string), declaringType: typeof(DatePickerCtrl), defaultValue: default(string));
public string Placeholder { get; set; }
}
this file or code also is save to (Myproj)
BirthdayDatePickerControl.cs:
public class BirthdayDatePickerControl : DatePicker
{
public static readonly BindableProperty EnterTextProperty = BindableProperty.Create(propertyName: "Placeholder", returnType: typeof(string), declaringType: typeof(BirthdayDatePickerControl), defaultValue: default(string));
public string Placeholder { get; set; }
}
This is my code(Myproj.android):
[assembly: ExportRenderer(typeof(BirthdayDatePickerControl), typeof(BirthdayDatePickerRenderer))] // this line is outside of my namespace in BirthdayDatePickerRenderer.cs
BirthdayDatePickerRenderer.cs
public class BirthdayDatePickerRenderer : DatePickerRenderer
{
public BirthdayDatePickerRenderer(Context context) : base(context)
{
}
protected override void OnElementChanged(ElementChangedEventArgs<Xamarin.Forms.DatePicker> e)
{
base.OnElementChanged(e);
if (Control != null)
{
Control.Text = "Birth Date";
}
}
}
My expected output is still I can place an placeholder to my datepicker UI, and also get that data from datepicker and same it to firebase.
I tried some trial and error
This is what I've done
async public void signButton_Clicked(System.Object sender, System.EventArgs e)
{
/*
some code here like assigning firstname or lastname and etc.
*/
string dateOfBirth = entryField_DateOfBirth.ToString();
CUSTOMER customer = new CUSTOMER();
customer.CusBirthOfDate = dateOfBirth;
var Savedata = await customerRepo.Save(customer);
}
I think you have done most of the work. Just make a small change to the Button Clicked handler:
async public void signButton_Clicked(System.Object sender, System.EventArgs e)
{
...
var date = entryField_DateOfBirth.Date.ToString().Split(" ")[0]; //get the date
...
}
If you want to set the default placeholder of Datepicker to "Birth Date", you should still use a custom render, otherwise xamarin forms Datepicker cannot recognize this kind of string. For more info, you could refer to Xamarin.Forms DatePicker.
Hope it works for you.
Related
My problem is, the data which is date entered by user is doesn't after submit button. So I have fields in my registration page and A button to save in my database.
This is what I've tried.
//My Datepicker Design
`
<local:BirthdayDatePickerControl
TextColor="Black"
x:Name="entryField_DateOfBirth"
/>
`
The purpose that I create a custom control in my datepicker is to put an placeholder iny my datepicker field.
//my Birthdaypickercontrol.cs
`
public class BirthdayDatePickerControl : DatePicker
{
public event EventHandler ClearRequested;
// for my placeholder "birthdate"
public static readonly BindableProperty EnterTextProperty = BindableProperty.Create(propertyName: "Placeholder", returnType: typeof(string), declaringType: typeof(BirthdayDatePickerControl), defaultValue: default(string));
public string Placeholder { get; set; }
//function to clear data of my datepicker input
public void clear()
{
if (ClearRequested != null)
{
ClearRequested(this, EventArgs.Empty);
}
}
}
`
In my project.android, I create a birthday renderer.cs
//so this is my code
`
[assembly: ExportRenderer(typeof(BirthdayDatePickerControl), typeof(BirthdayDatePickerRenderer))]
public class BirthdayDatePickerRenderer : DatePickerRenderer
{
public BirthdayDatePickerRenderer(Context context) : base(context)
{
}
EditText editText;
protected override void OnElementChanged(ElementChangedEventArgs<Xamarin.Forms.DatePicker> e)
{
base.OnElementChanged(e);
//code for placeholder
if (Control != null)
{
Control.Text = "Birth Date";
}
//end here
//code start here for clearing the data in datepicker input field
editText = Control as EditText;
if (e.NewElement != null)
{
BirthdayDatePickerControl bdaydatePickerControl = e.NewElement as BirthdayDatePickerControl;
bdaydatePickerControl.ClearRequested += DatePickerControl_ClearRequested;
}
//end here
}
public void DatePickerControl_ClearRequested(object sender, EventArgs e)
{
editText.Text = string.Empty;
}
}
`
The codes I pasted will anyway, but..
Assuming in the onload of my registration page, The UI will be like this( pic for reference and ctto to google). After user choose birthdate, example 12/1/22 and hit submit button(all data save in to database). The problem is the placeholder "birthdate" remove/disappear Like this, then if I click the datepicker input field to check the date, the date is still pointing in 12/1/22. What I expected is after performing the ClearData(), the date should be reset in today's date.
//this is my ClearData() function
`
public void ClearData()
{
entryField_DateOfBirth.clear();// this is what I tried and got an bad ouput
}
`
You said:
What I expected is after performing the ClearData(), the date should be reset in today's date.
public void DatePickerControl_ClearRequested(object sender, EventArgs e)
{
editText.Text = string.Empty;
}
Change to this:
public void DatePickerControl_ClearRequested(object sender, EventArgs e)
{
BirthdayDatePickerControl birthdayDate = sender as BirthdayDatePickerControl;
birthdayDate.Date = DateTime.Now;
editText.Text = "Birth Date";
}
I want get data selected in my viewModel
this is my xaml, but i donot know how solved my xaml, because this is bad, how use my behavior here in my xaml?
<ListView.Behaviors>
<behaviors:ItemTappedBehavior EventName="ItemSelected">
<behaviors:InvokeCommandAction Command="{Binding SelectedTagChanged}" />
</behaviors:ItemTappedBehavior>
</ListView.Behaviors>
<ListView ItemsSource="{Binding actors}" ItemTapped="ListView_ItemTapped">
in my behindcode
public partial class ActorsView : ContentPage
{
public AccountsView()
{
InitializeComponent();
}
async void ListView_ItemTapped(object sender, ItemTappedEventArgs e)
{
Actor selectedItem = (Actor)e.Item;
Console.WriteLine("WORK"+ Actor.Name);
}
but i want to get in my viewModel, dont in my behind code
i've seen to solved is with commands, or behaviors
this is my viewModel:
public class ActorsViewModel : ViewModelBase
{
public List<Actor> actors { get; set; }
public AccountsViewModel(IActorManager actorManager)
: base()
{
Edit, i am using commands but i dont know how use the answer from John Livermore, i want to use and show the console Console.WriteLine("ROW");.
public class ItemTappedBehavior : Behavior<ListView>
{
public ICommand Command { get; set; }
protected override void OnAttachedTo(ListView bindable)
{
base.OnAttachedTo(bindable);
}
protected override void OnDetachingFrom(ListView bindable)
{
base.OnDetachingFrom(bindable);
}
public Command SelectedTagChanged
{
get
{
return new Command(row =>
{
Console.WriteLine("ROW");
});
}
}
}
Since you had asked for a simpler Behavior for ListView selection changed. Please use the following:
Following class is inherited from BehaviorBase which takes care of BindingContext allocation.
On the OnAttachedTo override the ItemSelected event is hooked.
On the OnDetachingFrom override the ItemSelected event is unhooked.
Command bindable property Binds to the Command in ViewModel
In the event the e.SelectedItem is passed to the Command. (Change
it to whatever value you wish to pass)
public class SelectionChangedEventBehavior : BehaviorBase<ListView>
{
public static readonly BindableProperty CommandProperty = BindableProperty.Create("Command", typeof(ICommand), typeof(SelectionChangedEventBehavior), null);
public ICommand Command
{
get { return (ICommand)GetValue(CommandProperty); }
set { SetValue(CommandProperty, value); }
}
protected override void OnAttachedTo(BindableObject bindable)
{
base.OnAttachedTo(bindable);
AssociatedObject.ItemSelected += AssociatedObject_ItemSelected;
}
protected override void OnDetachingFrom(ListView bindable)
{
base.OnDetachingFrom(bindable);
AssociatedObject.ItemSelected -= AssociatedObject_ItemSelected;
}
private void AssociatedObject_ItemSelected(object sender, SelectedItemChangedEventArgs e)
{
if (Command != null)
{
Command.Execute(e.SelectedItem);
}
}
}
Usage
Xaml
<ListView ItemsSource="{Binding Collection}">
<ListView.Behaviors>
<local:SelectionChangedEventBehavior Command="{Binding SelectionCommand}" />
</ListView.Behaviors>
</ListView>
ViewModel
public class ViewModel : INotifyPropertyChanged
{
public Command<object> SelectionCommand { get; set; }
public ViewModel()
{
SelectionCommand = new Command<object>(OnSelection);
}
private void OnSelection(object item)
{
var selectedActor = (item as Actor);
}
}
Hope this could be useful for you. If possible use the EventToCommandBehavior as whole, just because you can reuse it for any control and any event.
In your XAML do the following:
Set your <ListView ItemsSource="{Binding actors}" ItemTapped="ListView_ItemTapped">
to be <ListView ItemsSource="{Binding actors}" SelectedItem = "{Binding SelectedActor, Mode=TwoWay}>
In your view model which your current XAML is bound to, create two new variables as so:
private Actor selectedActor;
public Actor SelectedActor {
get {return selectedActor;}
set {
selectedActor = value;
if(selectedActor != null) {//set properties here if needed}
OnPropertyChanged("SelectedActor"); //or however you raise your events, this is a
//custom method i've made
}
Now, where we define our actors item source, we will also define what a selectedActor is as so:
//get your actors, loop over them and add them to the list of actors
var actorItem = new Actor();
actors.Add(actorItem);
//outside of list raise the property changed event on your actors list.
OnPropertyChanged("actors")
That is a the pattern that i've used at work to get my selected item. If you then need to do something with it you could define it within the SelectedActor variable. For us our app is a hybrid between old xamarin (.Android and .iOS) and .Forms, so we pass Actions from the native level to the view model (ex: loading the summary page for the selected item)
I'm trying to create a custom entry control with EntryType property which I then use inside custom renderers to set platform specific values. But the EntryType is never set when used from Xaml. Here's my code:
public class ExtendedEntry : Xamarin.Forms.Entry
{
public static readonly BindableProperty EntryTypeProperty = BindableProperty.Create(
propertyName: "EntryType",
returnType: typeof(int),
declaringType: typeof(EntryTextType),
defaultValue: 1
);
public EntryTextType EntryType
{
get
{
return (EntryTextType)GetValue(EntryTypeProperty);
}
set
{
SetValue(EntryTypeProperty, value);
}
}
protected override void OnPropertyChanged([CallerMemberName] string propertyName = null)
{
base.OnPropertyChanged(propertyName);
if (propertyName == EntryTypeProperty.PropertyName)
{
}
}
}
public enum EntryTextType
{
Any,
Numeric,
Url,
Email
}
public class ExtendedEntryRenderer : EntryRenderer
{
public ExtendedEntryRenderer(Android.Content.Context context) : base(context)
{
}
protected override void OnElementChanged(ElementChangedEventArgs<Entry> e)
{
base.OnElementChanged(e);
if (Control != null)
{
var element = (ExtendedEntry)Element;
Control.Hint = element.Placeholder;
switch(element.EntryType)
{
case EntryTextType.Numeric:
Control.SetRawInputType(Android.Text.InputTypes.ClassNumber);
break;
default:
break;
}
}
}
protected override void OnElementPropertyChanged(object sender, PropertyChangedEventArgs e)
{
var p = e.PropertyName;
base.OnElementPropertyChanged(sender, e);
}
}
And then in XAML, I use the control as this:
<controls:ExtendedEntry Placeholder="Password" IsPassword="True" Text="{Binding Secret}" EntryType="Any"/>
The problem is, EntryType never gets set to EntryTextType.Any, and always uses the default value of EntryTextType.Numeric. What am I missing here? Thanks.
I noticed some discrepancies in the EntryTypeProperty declaration.
Declaring type should be the owner which is ExtendedEntry
And, to instruct XAML to use the enum TypeConverter, you will have to define the datatype as EntryTextType
So your new code will look like:
public static readonly BindableProperty EntryTypeProperty = BindableProperty.Create(
propertyName: "EntryType",
returnType: typeof(EntryTextType),
declaringType: typeof(ExtendedEntry),
defaultValue: EntryTextType.Numeric
);
I tried setting the new feature in Xamarin Forms 3 which is ReturnType and I have set it to Next. My form has multiple fields and I want to make that the next Entry is focused when the Next button is pressed. However it just closes the keyboard. I did read the documents however I could not find the way to focus it to the next Entry. Can someone please guide?
Thanks in advance.
Those who want to know how I implemented it, it is as follows:
I created a behavior which will handle the OnAttachedTo and OnDetachingFrom so that I can handle the Completed event to move the focus. Now for that, I need a BindableProperty. I created the following code out of the logic:
public class NextEntryBehavior : Behavior<Entry>
{
public static readonly BindableProperty NextEntryProperty = BindableProperty.Create(nameof(NextEntry), typeof(Entry), typeof(Entry), defaultBindingMode: BindingMode.OneTime, defaultValue: null);
public Entry NextEntry
{
get => (Entry)GetValue(NextEntryProperty);
set => SetValue(NextEntryProperty, value);
}
protected override void OnAttachedTo(Entry bindable)
{
bindable.Completed += Bindable_Completed;
base.OnAttachedTo(bindable);
}
private void Bindable_Completed(object sender, EventArgs e)
{
if (NextEntry != null)
{
NextEntry.Focus();
}
}
protected override void OnDetachingFrom(Entry bindable)
{
bindable.Completed -= Bindable_Completed;
base.OnDetachingFrom(bindable);
}
}
As you can see, there is a NextEntry property, we use it via XAML to focus on the desired entry field once the user marks it as complete using the Next button.
XAML:
<Entry ReturnType="Next">
<Entry.Behaviors>
<behaviors:NextEntryBehavior NextEntry="{x:Reference LastName}" />
</Entry.Behaviors>
</Entry>
In the above behavior, the LastName reference I used is the control to which the focus should go when the user taps on Next.
This way, it worked as expected and is reusable across the project.
the property ReturnType for Entry will only set graphically the Return Key in Keyboard to the specified type - Next in your case.
In order to set Focus for another Entry in the view you need to call Focus() from within the targeted Entry in the code-behind.
For Example:
private void txtUsername_OnCompleted(object sender, EventArgs e)
{
txtPassword.Focus();
}
if you're applying MVVM pattern. You will need a property in the Entry to Bind on for ViewModel property. One way to achieve this is by extending Entry control to add a bindable property called "IsActive" and create a Trigger that listens for changes on this property and calls Focus(), like below:
public class ExtendedEntry : Entry
{
public static readonly BindableProperty IsActiveProperty = BindableProperty.Create(
nameof(IsActive),
typeof(bool),
typeof(ExtendedEntry),
defaultBindingMode: BindingMode.TwoWay,
defaultValue: false);
public bool IsActive
{
get => (bool)GetValue(IsActiveProperty);
set => SetValue(IsActiveProperty, value);
}
private Trigger _isActiveTriger;
private EntryIsActiveAction _activeAction;
public ExtendedEntry()
{
InitTriggers();
}
private void InitTriggers()
{
InitIsActiveTrigger();
}
private void InitIsActiveTrigger()
{
_activeAction = new EntryIsActiveAction();
_isActiveTriger = new Trigger(typeof(ExtendedEntry))
{
Value = false,
Property = IsActiveProperty,
EnterActions = { _activeAction },
ExitActions = { _activeAction }
};
Triggers.Add(_isActiveTriger);
}
}
public class EntryIsActiveAction : TriggerAction<ExtendedEntry>
{
protected override void Invoke(ExtendedEntry sender)
{
if (sender.IsActive)
{
sender.Focus();
return;
}
sender.Unfocus();
}
}
Example Usage:
Xaml page:
<Entry x:Name="txtPassword" IsActive="{Binding IsPasswordActive}" />
ViewModel:
private bool _isPasswordActive;
public bool IsPasswordActive
{
get => _isPasswordActive;
set
{
_isPasswordActive = value;
OnPropertyChanged();
}
}
I have made a simple test for updating binded values in the UI but nothing seems to update, only intial values are set but never updated, what would i be missing?
code:
//the model class
public class DemoCustomer : INotifyPropertyChanged
{
// These fields hold the values for the public properties.
private Guid idValue = Guid.NewGuid();
private string customerNameValue = String.Empty;
private string phoneNumberValue = String.Empty;
public event PropertyChangedEventHandler PropertyChanged= delegate { };
// This method is called by the Set accessor of each property.
// The CallerMemberName attribute that is applied to the optional propertyName
// parameter causes the property name of the caller to be substituted as an argument.
private void NotifyPropertyChanged([CallerMemberName] String propertyName = "")
{
if (PropertyChanged != null)
{
PropertyChanged(this, new PropertyChangedEventArgs(propertyName));
}
}
// The constructor is private to enforce the factory pattern.
public DemoCustomer()
{
customerNameValue = "Customer";
phoneNumberValue = "(312)555-0100";
}
// This is the public factory method.
public static DemoCustomer CreateNewCustomer()
{
return new DemoCustomer();
}
// This property represents an ID, suitable
// for use as a primary key in a database.
public Guid ID
{
get
{
return this.idValue;
}
}
public string CustomerName
{
get
{
return this.customerNameValue;
}
set
{
if (value != this.customerNameValue)
{
this.customerNameValue = value;
NotifyPropertyChanged();
}
}
}
public string PhoneNumber
{
get
{
return this.phoneNumberValue;
}
set
{
if (value != this.phoneNumberValue)
{
this.phoneNumberValue = value;
NotifyPropertyChanged();
}
}
}
}
Then simply in my main page i do this:
public ObservableCollection<DemoCustomer> progcollection = new ObservableCollection<DemoCustomer>();
public MainPage()
{
this.InitializeComponent();
progcollection = new ObservableCollection<DemoCustomer>();
this.progcollection.Add(new DemoCustomer());
this.txtblk.DataContext = progcollection[0].CustomerName;
}
Then in a click listener for example i do this:
private void Button_Click_1(object sender, RoutedEventArgs e)
{
progcollection[0].CustomerName = "we changed the name!";
}
But nothing updates in the UI!!!
And here is my XAML:
<Page
x:Class="downloadprogressbinding.MainPage"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:local="using:simpledownload"
xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
mc:Ignorable="d">
<Grid Background="{ThemeResource ApplicationPageBackgroundThemeBrush}">
<TextBlock x:Name="txtblk" HorizontalAlignment="Left" Margin="994,421,0,0" TextWrapping="Wrap" Text="{Binding Mode=TwoWay}" VerticalAlignment="Top" Height="89" Width="226" FontSize="36"/>
<Button Content="Button" HorizontalAlignment="Left" Height="51" Margin="116,24,0,0" VerticalAlignment="Top" Width="407" Click="Button_Click_1"/>
</Grid>
Using path keyword in binding and specifying the field solved it,like this:
{Binding Path=thetext, Mode=TwoWay}