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Button not disabled on page load in Xamarin.Forms

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0

I have a button in my page. I want to disable this button on page load, but its not disabled.

XAML:

 <Button IsEnabled="Binding IsEnabledSaveBtn,Mode=TwoWay" Text="Save" Command="Binding SaveItem" />

ViewModel:

bool _isEnabledSaveBtn = false;
 public bool IsEnabledSaveBtn
 
 get return _isEnabledSaveBtn; 
 set
 
 _isEnabledSaveBtn = value;
 OnPropertyChanged();
 
 

Inside ViewModel Constructor:

public CreateDiscountViewModel(INavigation navigation)
 
 Navigation = navigation;
 IsEnabledSaveBtn=False;
 

I'm also validating data on TextChange event and it's working fine. But I want to disable this button on page load.

How can I solve this?

xamarin xamarin.forms

share|improve this question

edited Mar 8 at 7:33

DenseCrab

1,012820

asked Mar 8 at 7:17

VidhyaVidhya

698

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Where is the problem at all? You are probably using some MVVM framework that you haven't specified and we can only guess, but if it handles PropertyChanged when you call IsEnabledSaveBtn=False; it will disable the button...
  
  – Ivan Ičin
  Mar 8 at 9:17
  

  
  
  
  


• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  Are you setting your BindingContext to your CreateDiscountViewModel?
  
  – TaylorD
  Mar 8 at 17:05
  
  

  
  
  
  

add a comment | 

0

I have a button in my page. I want to disable this button on page load, but its not disabled.

XAML:

 <Button IsEnabled="Binding IsEnabledSaveBtn,Mode=TwoWay" Text="Save" Command="Binding SaveItem" />

ViewModel:

bool _isEnabledSaveBtn = false;
 public bool IsEnabledSaveBtn
 
 get return _isEnabledSaveBtn; 
 set
 
 _isEnabledSaveBtn = value;
 OnPropertyChanged();
 
 

Inside ViewModel Constructor:

public CreateDiscountViewModel(INavigation navigation)
 
 Navigation = navigation;
 IsEnabledSaveBtn=False;
 

I'm also validating data on TextChange event and it's working fine. But I want to disable this button on page load.

How can I solve this?

xamarin xamarin.forms

share|improve this question

edited Mar 8 at 7:33

DenseCrab

1,012820

asked Mar 8 at 7:17

VidhyaVidhya

698

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Where is the problem at all? You are probably using some MVVM framework that you haven't specified and we can only guess, but if it handles PropertyChanged when you call IsEnabledSaveBtn=False; it will disable the button...
  
  – Ivan Ičin
  Mar 8 at 9:17
  

  
  
  
  


• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  Are you setting your BindingContext to your CreateDiscountViewModel?
  
  – TaylorD
  Mar 8 at 17:05
  
  

  
  
  
  

add a comment | 

I have a button in my page. I want to disable this button on page load, but its not disabled.

XAML:

 <Button IsEnabled="Binding IsEnabledSaveBtn,Mode=TwoWay" Text="Save" Command="Binding SaveItem" />

ViewModel:

bool _isEnabledSaveBtn = false;
 public bool IsEnabledSaveBtn
 
 get return _isEnabledSaveBtn; 
 set
 
 _isEnabledSaveBtn = value;
 OnPropertyChanged();
 
 

Inside ViewModel Constructor:

public CreateDiscountViewModel(INavigation navigation)
 
 Navigation = navigation;
 IsEnabledSaveBtn=False;
 

I'm also validating data on TextChange event and it's working fine. But I want to disable this button on page load.

How can I solve this?

xamarin xamarin.forms

share|improve this question

edited Mar 8 at 7:33

DenseCrab

1,012820

asked Mar 8 at 7:17

VidhyaVidhya

698

 <Button IsEnabled="Binding IsEnabledSaveBtn,Mode=TwoWay" Text="Save" Command="Binding SaveItem" />

bool _isEnabledSaveBtn = false;
 public bool IsEnabledSaveBtn
 
 get return _isEnabledSaveBtn; 
 set
 
 _isEnabledSaveBtn = value;
 OnPropertyChanged();
 
 

public CreateDiscountViewModel(INavigation navigation)
 
 Navigation = navigation;
 IsEnabledSaveBtn=False;
 

share|improve this question

edited Mar 8 at 7:33

DenseCrab

1,012820

asked Mar 8 at 7:17

VidhyaVidhya

698

share|improve this question

edited Mar 8 at 7:33

DenseCrab

1,012820

asked Mar 8 at 7:17

VidhyaVidhya

698

edited Mar 8 at 7:33

DenseCrab

1,012820

edited Mar 8 at 7:33

DenseCrab

1,012820

asked Mar 8 at 7:17

VidhyaVidhya

698

asked Mar 8 at 7:17

VidhyaVidhya

698

2 Answers
2

active

oldest

votes

0

You need the following changes:

In your XAML you do not need two-way binding :

<Button IsEnabled="Binding IsEnabledSaveBtn" Text="Save" Command="Binding SaveItem" />

Your Property should look something like this:

 private bool _isEnabledSaveBtn;
 public bool IsEnabledSaveBtn
 
 get return _isEnabledSaveBtn; 
 set
 
 _isEnabledSaveBtn = value;
 OnPropertyChanged(nameof(IsEnabledSaveBtn));
 
 

And in your ViewModel constructor set the value:

public CreateDiscountViewModel(INavigation navigation)
 
 Navigation = navigation;
 IsEnabledSaveBtn = false;
 

share|improve this answer

answered Mar 8 at 8:50

G.hakimG.hakim

5,30211136

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Not working :( still button not disabled on load
  
  – Vidhya
  Mar 8 at 10:10
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Is this button in a listview or any type of datatemplate?
  
  – G.hakim
  Mar 8 at 10:12
  
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  No this button in not in listview. on text change event its working fine.but on page load its not working
  
  – Vidhya
  Mar 8 at 10:13
  

  
  
  
  

add a comment | 

0

Something seems to be wrong with your OnPropertyChanged event.

Try the following, it will work.

is Button Enabled:

bool _isEnabledSaveBtn = false;
 public bool IsEnabledSaveBtn
 
 get return _isEnabledSaveBtn; 
 set
 
 _isEnabledSaveBtn = value;
 OnPropertyChanged("IsEnabledSaveBtn");
 
 

OnPropertyChanged

 public event PropertyChangedEventHandler PropertyChanged;
 protected void OnPropertyChanged(string propertyName)
 
 var handler = PropertyChanged;
 if (handler != null)
 handler(this, new PropertyChangedEventArgs(propertyName));
 

and in your contructor

IsEnabledSaveBtn = false;

share|improve this answer

answered Mar 8 at 8:50

GeralexGRGeralexGR

93251421

add a comment | 

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0

You need the following changes:

In your XAML you do not need two-way binding :

<Button IsEnabled="Binding IsEnabledSaveBtn" Text="Save" Command="Binding SaveItem" />

Your Property should look something like this:

 private bool _isEnabledSaveBtn;
 public bool IsEnabledSaveBtn
 
 get return _isEnabledSaveBtn; 
 set
 
 _isEnabledSaveBtn = value;
 OnPropertyChanged(nameof(IsEnabledSaveBtn));
 
 

And in your ViewModel constructor set the value:

public CreateDiscountViewModel(INavigation navigation)
 
 Navigation = navigation;
 IsEnabledSaveBtn = false;
 

share|improve this answer

answered Mar 8 at 8:50

G.hakimG.hakim

5,30211136

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Not working :( still button not disabled on load
  
  – Vidhya
  Mar 8 at 10:10
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Is this button in a listview or any type of datatemplate?
  
  – G.hakim
  Mar 8 at 10:12
  
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  No this button in not in listview. on text change event its working fine.but on page load its not working
  
  – Vidhya
  Mar 8 at 10:13
  

  
  
  
  

add a comment | 

0

You need the following changes:

In your XAML you do not need two-way binding :

<Button IsEnabled="Binding IsEnabledSaveBtn" Text="Save" Command="Binding SaveItem" />

Your Property should look something like this:

 private bool _isEnabledSaveBtn;
 public bool IsEnabledSaveBtn
 
 get return _isEnabledSaveBtn; 
 set
 
 _isEnabledSaveBtn = value;
 OnPropertyChanged(nameof(IsEnabledSaveBtn));
 
 

And in your ViewModel constructor set the value:

public CreateDiscountViewModel(INavigation navigation)
 
 Navigation = navigation;
 IsEnabledSaveBtn = false;
 

share|improve this answer

answered Mar 8 at 8:50

G.hakimG.hakim

5,30211136

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Not working :( still button not disabled on load
  
  – Vidhya
  Mar 8 at 10:10
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Is this button in a listview or any type of datatemplate?
  
  – G.hakim
  Mar 8 at 10:12
  
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  No this button in not in listview. on text change event its working fine.but on page load its not working
  
  – Vidhya
  Mar 8 at 10:13
  

  
  
  
  

add a comment | 

You need the following changes:

In your XAML you do not need two-way binding :

<Button IsEnabled="Binding IsEnabledSaveBtn" Text="Save" Command="Binding SaveItem" />

Your Property should look something like this:

 private bool _isEnabledSaveBtn;
 public bool IsEnabledSaveBtn
 
 get return _isEnabledSaveBtn; 
 set
 
 _isEnabledSaveBtn = value;
 OnPropertyChanged(nameof(IsEnabledSaveBtn));
 
 

And in your ViewModel constructor set the value:

public CreateDiscountViewModel(INavigation navigation)
 
 Navigation = navigation;
 IsEnabledSaveBtn = false;
 

share|improve this answer

answered Mar 8 at 8:50

G.hakimG.hakim

5,30211136

<Button IsEnabled="Binding IsEnabledSaveBtn" Text="Save" Command="Binding SaveItem" />

 private bool _isEnabledSaveBtn;
 public bool IsEnabledSaveBtn
 
 get return _isEnabledSaveBtn; 
 set
 
 _isEnabledSaveBtn = value;
 OnPropertyChanged(nameof(IsEnabledSaveBtn));
 
 

public CreateDiscountViewModel(INavigation navigation)
 
 Navigation = navigation;
 IsEnabledSaveBtn = false;
 

share|improve this answer

answered Mar 8 at 8:50

G.hakimG.hakim

5,30211136

answered Mar 8 at 8:50

G.hakimG.hakim

5,30211136

answered Mar 8 at 8:50

G.hakimG.hakim

5,30211136

0

Something seems to be wrong with your OnPropertyChanged event.

Try the following, it will work.

is Button Enabled:

bool _isEnabledSaveBtn = false;
 public bool IsEnabledSaveBtn
 
 get return _isEnabledSaveBtn; 
 set
 
 _isEnabledSaveBtn = value;
 OnPropertyChanged("IsEnabledSaveBtn");
 
 

OnPropertyChanged

 public event PropertyChangedEventHandler PropertyChanged;
 protected void OnPropertyChanged(string propertyName)
 
 var handler = PropertyChanged;
 if (handler != null)
 handler(this, new PropertyChangedEventArgs(propertyName));
 

and in your contructor

IsEnabledSaveBtn = false;

share|improve this answer

answered Mar 8 at 8:50

GeralexGRGeralexGR

93251421

add a comment | 

0

Something seems to be wrong with your OnPropertyChanged event.

Try the following, it will work.

is Button Enabled:

bool _isEnabledSaveBtn = false;
 public bool IsEnabledSaveBtn
 
 get return _isEnabledSaveBtn; 
 set
 
 _isEnabledSaveBtn = value;
 OnPropertyChanged("IsEnabledSaveBtn");
 
 

OnPropertyChanged

 public event PropertyChangedEventHandler PropertyChanged;
 protected void OnPropertyChanged(string propertyName)
 
 var handler = PropertyChanged;
 if (handler != null)
 handler(this, new PropertyChangedEventArgs(propertyName));
 

and in your contructor

IsEnabledSaveBtn = false;

share|improve this answer

answered Mar 8 at 8:50

GeralexGRGeralexGR

93251421

add a comment | 

Something seems to be wrong with your OnPropertyChanged event.

Try the following, it will work.

is Button Enabled:

bool _isEnabledSaveBtn = false;
 public bool IsEnabledSaveBtn
 
 get return _isEnabledSaveBtn; 
 set
 
 _isEnabledSaveBtn = value;
 OnPropertyChanged("IsEnabledSaveBtn");
 
 

OnPropertyChanged

 public event PropertyChangedEventHandler PropertyChanged;
 protected void OnPropertyChanged(string propertyName)
 
 var handler = PropertyChanged;
 if (handler != null)
 handler(this, new PropertyChangedEventArgs(propertyName));
 

and in your contructor

IsEnabledSaveBtn = false;

share|improve this answer

answered Mar 8 at 8:50

GeralexGRGeralexGR

93251421

bool _isEnabledSaveBtn = false;
 public bool IsEnabledSaveBtn
 
 get return _isEnabledSaveBtn; 
 set
 
 _isEnabledSaveBtn = value;
 OnPropertyChanged("IsEnabledSaveBtn");
 
 

 public event PropertyChangedEventHandler PropertyChanged;
 protected void OnPropertyChanged(string propertyName)
 
 var handler = PropertyChanged;
 if (handler != null)
 handler(this, new PropertyChangedEventArgs(propertyName));
 

IsEnabledSaveBtn = false;

share|improve this answer

answered Mar 8 at 8:50

GeralexGRGeralexGR

93251421

answered Mar 8 at 8:50

GeralexGRGeralexGR

93251421

answered Mar 8 at 8:50

GeralexGRGeralexGR

93251421