Data Validation in UWP AutoComplete (SfTextBoxExt)
10 May 20216 minutes to read
All editors have the data validation support, it can be done by inheriting the model class from the Syncfusion.UI.Xaml.Controls.Data.IDataValidation.
NOTE
The Model should also inherit the INotifyPropertyChanged Interface.
The following code sample shows the model class:
public class DataValidationHelper : INotifyPropertyChanged, IDataValidation
{
private string name;
public string Name
{
get { return name; }
set
{
name = value;
RaisePropertyChanged("Name");
RaisePropertyChanged("Error");
}
}
public string Error
{
get
{
if (String.IsNullOrEmpty(Name))
{
return "Name field required.";
}
return "";
}
}
public string this[string columnname]
{
get
{
switch (columnname)
{
case "Name":
if (String.IsNullOrEmpty(Name))
{
return "Name field required.";
}
break;
}
return "";
}
}
public event PropertyChangedEventHandler PropertyChanged;
public void RaisePropertyChanged(string propertyname)
{
if (PropertyChanged != null)
{
PropertyChanged(this, new PropertyChangedEventArgs(propertyname));
}
}Public Class DataValidationHelper
Implements INotifyPropertyChanged, IDataValidation
Private name_Renamed As String
Public Property Name() As String
Get
Return name_Renamed
End Get
Set(ByVal value As String)
name_Renamed = value
RaisePropertyChanged("Name")
RaisePropertyChanged("Error")
End Set
End Property
Public ReadOnly Property [Error]() As String
Get
If String.IsNullOrEmpty(Name) Then
Return "Name field required."
End If
End Get
Return ""
End Property
Default Public ReadOnly Property Item(ByVal columnname As String) As String
Get
Select Case columnname
Case "Name"
If String.IsNullOrEmpty(Name) Then
Return "Name field required."
End If
End Select
Return ""
End Get
End Property
Public Event PropertyChanged As PropertyChangedEventHandler Implements INotifyPropertyChanged.PropertyChanged
Public Sub RaisePropertyChanged(ByVal propertyname As String)
RaiseEvent PropertyChanged(Me, New PropertyChangedEventArgs(propertyname))
End SubNotifyOnDataErrors
Gets or Sets the bool value which determine the enable or disable the DataValidation with the control.
PropertyPath
Gets or sets the name of the property which bound to the SfTextBoxExt Value property.
<Page xmlns:data="using:Syncfusion.UI.Xaml.Controls.Data" xmlns:Input="using:Syncfusion.UI.Xaml.Controls.Input">
<Grid Background="{StaticResource ApplicationPageBackgroundThemeBrush}">
<StackPanel Margin="5" Orientation="Vertical">
<TextBlock Text="Name:" />
<Input:SfTextBoxExt x:Name="NameBox"
Width="250"
Text="{Binding Name,Mode=TwoWay}"
data:DataValidation.NotifyOnDataErrors="True"
data:DataValidation.PropertyPath="Name" />
</StackPanel>
</Grid>
</Page>NOTE
The following additional properties have the status of DataValidation:
HasError: Gets whether the element has data error or not.
ErrorMessage: Gets or sets the name of the property which bound to the SfTextBoxExt Value property.