How to implemente mask behavior in xamarin

Question

Rajanikant Hawaldar · Answer

https://www.c-sharpcorner.com/article/how-to-mask-phone-number-like-xxx-xxx-xxxx-in-xamarin-forms-using-behaviors/ https://www.c-sharpcorner.com/article/input-validation-in-xamarin-forms-behaviors/ public class MaskedText : Behavior { private string _mask = "" ; public string Mask { get => _mask; set { _mask = value; SetPositions(); } } protected override void OnAttachedTo(Entry entry) { entry.TextChanged += OnEntryTextChanged; base .OnAttachedTo(entry); } protected override void OnDetachingFrom(Entry entry) { entry.TextChanged -= OnEntryTextChanged; base .OnDetachingFrom(entry); } IDictionary int , char > _positions; void SetPositions() { if ( string .IsNullOrEmpty(Mask)) { _positions = null ; return ; } var list = new Dictionary int , char >(); for (var i = 0; i if (Mask[i] != 'X' ) list.Add(i, Mask[i]); _positions = list; } private void OnEntryTextChanged( object sender, TextChangedEventArgs args) { var entry = sender as Entry; var text = entry.Text; if ( string .IsNullOrWhiteSpace(text) || _positions == null ) return ; if (text.Length > _mask.Length) { entry.Text = text.Remove(text.Length - 1); return ; } foreach (var position in _positions) if (text.Length >= position.Key + 1) { var value = position.Value.ToString(); if (text.Substring(position.Key, 1) != value) text = text.Insert(position.Key, value); } if (entry.Text != text) entry.Text = text; } } UI Code: ContentPage xmlns = "http://xamarin.com/schemas/2014/forms" xmlns:x = "http://schemas.microsoft.com/winfx/2009/xaml" xmlns:behavior = "clr-namespace:Enterprise.Behaviors" x:Class = "Enterprise.View.Features.Main.MainView" > ContentPage.Content > StackLayout VerticalOptions = "Center" > Entry Keyboard = "Numeric" > Entry.Behaviors > behavior:MaskedText Mask = "(XXX) XXX-XXX" /> Entry.Behaviors > Entry > StackLayout > ContentPage.Content > ContentPage >

Shrishail Pattar · Answer

Thanks you for helping

How to implemente mask behavior in xamarin

Answers (2)