CODEWITHSUNDEEP
c#wpf
AnOldNew_Coder
AnOldNew_Coder

Reputation: 33

How to code A mandatory entry in this field

<Border Grid.Row="1" Background="Gray" Padding="7">
  <StackPanel Orientation="Horizontal" HorizontalAlignment="Right" Margin="0,0,30,0">
    <optimumScheduler:LookUpOKButton Grid.Row="1" Content="OK" HorizontalAlignment="Center" Padding="20,0,20,0" Margin="0,0,20,0"/>
    <optimumScheduler:LookUpCancelButton Grid.Row="1" Content="Cancel" HorizontalAlignment="Center" Padding="20,0,20,0"/>

I need to condition the entry. I need to condition the OK button. If the user does not enter one of the following: Patient, Doctor/Therapist, DEpartment then we would want to disable the OK button or not allow entry.

here they are defined. one of them. How would i code that it has to have an entry in Subject

public static string FormatAppointmentFormCaption(bool allDay, string subject, bool readOnly)
{
    string format = allDay ? "Event - {0}" : "Appt Editor - {0}";
    string text = subject;
    if (string.IsNullOrEmpty(text))
         text = "Untitled";
    text = String.Format(CultureInfo.InvariantCulture, format, text);
    if (readOnly)
         text += " [Read only]";
    return text;
}

Upvotes: 0

Views: 186

Answers (2)

Daniel
Daniel

Reputation: 11064

I recommend using the IDataErrorInfo interface and triggering the IsEnabled property of your button on the Validation.HasError property for your entry.

For example, your ViewModel may look like:

public class UserEntry: IDataErrorInfo
{
    public string UserType{get;set;}

    string IDataErrorInfo.this[string propertyName]
    {
        get
        {
            if(propertyName=="UserType")
            {
                // This is greatly simplified -- your validation may be different
                if(UserType != "Patient" || UserType != "Doctor" || UserType != "Department")
                {
                    return "Entry must be either Patient, Doctor, or Department.";
                }
            }
            return null;
        }
    }

    string IDataErrorInfo.Error
    {
        get
        {
            return null; // You can implement this if you like
        }
    }
}

And your View may have some XAML that looks similar to this:

<TextBox Name="_userType"
         Text="{Binding UserType, UpdateSourceTrigger=PropertyChanged, ValidatesOnDataErrors=true}" />

<Button Command="{Binding OKCommand}"
        Name="OK">
  <Button.Style>
    <Style TargetType="Button">
      <Style.Triggers>
        <DataTrigger Binding="{Binding ElementName=_userType, Path=(Validation.HasError), Mode=OneWay}"
                      Value="False">
          <Setter Property="IsEnabled"
                  Value="True" />
        </DataTrigger>
        <DataTrigger Binding="{Binding ElementName=_userType, Path=(Validation.HasError), Mode=OneWay}"
                      Value="True">
          <Setter Property="IsEnabled"
                  Value="False" />
        </DataTrigger>
      </Style.Triggers>
    </Style>
  </Button.Style>
</Button>

Upvotes: 1

trinaldi
trinaldi

Reputation: 2950

Check out this link. It was very helpful for me at the time!

ICommand Implementation

If by any chances you cannot accomplish using ICommand, use an if statement and set the element IsEnabled property to false:

if(String.IsNullOrEmpty(Patient) || String.IsNullOrEmpty(Doctor) || String.IsNullOrEmpty(Therapist) || String.IsNullOrEmpty(DEpartment))
{
    yourElement.IsEnabled = false
}

Assuming that Patient, Doctor, Therapist and DEpartment is a string property (i.e TextBox.Text, Label.Content, and so on...).

Upvotes: 0

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