CODEWITHSUNDEEP
xamarinmvvmxamarin.forms
Vidhya
Vidhya

Reputation: 443

Entry FindByName getting always null in xamarin forms mvvm

I have a button and i want to focus an entry on button click so my button command is:

public Command FocusPassword
        {
            get
            {
                return new Command(() =>
                {
                    Entry myEntry= Application.Current.MainPage.FindByName<Entry>("pEntry");
                    passwordEntry.Focus();
                });
            }
        }

myEntry always returning null,so how to solve this?

Upvotes: 0

Views: 1797

Answers (3)

Vidhya
Vidhya

Reputation: 443

I simply solve this:

Page currentPage = Navigation.NavigationStack.LastOrDefault();
                    Entry passwordEntry = currentPage.FindByName<Entry>("PassEntry");
                    passwordEntry.Focus();

Upvotes: 2

Leon Lu
Leon Lu

Reputation: 9234

You could try to use my demo as well. enter image description here

MainPage.xaml (Do not forget to BindingContext)

<?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:local="clr-namespace:EntryDemo"
         x:Class="EntryDemo.MainPage">

<StackLayout>

    <Grid Margin="10">
     <Grid.BindingContext>
            <local:BindingViewModel/>
     </Grid.BindingContext>

     <Grid.RowDefinitions>
            <RowDefinition Height="Auto" />
            <RowDefinition Height="Auto" />
            <RowDefinition Height="Auto" />
     </Grid.RowDefinitions>
     <Entry 
        Grid.Row="0"
        HorizontalOptions="CenterAndExpand"
        Text="account"
        x:Name="accountEntry"
         />
    <Entry 
        Text="password"
        Grid.Row="1"
        HorizontalOptions="CenterAndExpand"
        x:Name="pEntry"
     />
    <Button
        Grid.Row="2"
        HorizontalOptions="CenterAndExpand"
        x:Name="MyButton"
        Text="FocusEntry "
        Command="{Binding FocusCommand}"
        />
    </Grid>
</StackLayout>

</ContentPage>

You should run FindByName in execute method BindingViewModel.cs

 public class BindingViewModel: BindableObject
{
    public BindingViewModel()
    {

        FocusCommand = new Command(
            execute: () =>
            {
                Entry accountEntry = Application.Current.MainPage.FindByName<Entry>("accountEntry");
                Entry myEntry = Application.Current.MainPage.FindByName<Entry>("pEntry");
                accountEntry.Focus();

            }
     );

    }
    public ICommand FocusCommand { private set; get; }
}

Upvotes: 0

jgoldberger - MSFT
jgoldberger - MSFT

Reputation: 6098

Is it myEntry that is null, or passwordEntry? You are assigning the returned object to myEntry but then trying to set the focus on passwordEntry:

Entry myEntry= Application.Current.MainPage.FindByName<Entry>("pEntry");
passwordEntry.Focus();

And yes, make sure that the Entry does have the x:Name set to pEntry, e.g.:

 <Entry x:Name="pEntry" ... />

Upvotes: 0

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