CheckRulesOnRow on TextChanged

StrataFrame Forum

CheckRulesOnRow on TextChanged

http://forum.strataframe.net/Topic13718.aspx

By Marcel Heitlager - 1/24/2008

BindingUpdateMode is set to OnPropertyChanged. I'm trying to activate/deactivate a button depending on whether all required fields are filled in.

I figured I could do a CheckRulesOnRow when the textbox_TextChanged event occurs. But it seems that the business object hasn't been updated yet at this point. Is there a way to do this after the bo has been updated with the new value?

Thanks,

Marcel

By Marcel Heitlager - 1/24/2008

OK, after some further thought this is what I came up with. Am I killing a mosquito with an ICBM?

I added a custom field property to my business object (lValidated), added a propertychanged sub for each required field, which call me.CheckRequiredFieldRules function. Then on the form, the button's, enabled property is bound to the business object.

In business object:

Private _lValidated As Boolean = False
<Browsable(False), 
BusinessFieldDisplayInEditor(), _
Description("Boolean, Are All Required Fields Validated?"), _
DesignerSerializationVisibility(DesignerSerializationVisibility.Hidden)> _
Public ReadOnly Property [lValidated]() As Boolean
  Get
      Return _lValidated
  End Get
End Property
Protected Overrides Function GetCustomBindablePropertyDescriptors() _ As MicroFour.StrataFrame.Business.FieldPropertyDescriptor()
    Return New FieldPropertyDescriptor() {New ReflectionPropertyDescriptor("lValidated", Me.GetType())}
End Function
Private Sub CheckRequiredFieldRules()
   Dim llValidated As Boolean
   llValidated = Me.CheckRulesOnRow()
   If llValidated Then
      Me._lValidated = True
   Else
       Me._lValidated = False
   End If
End Sub
Private Sub boParticipants_address1Changed(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.address1Changed
   Me.CheckRequiredFieldRules()
End Sub

Then on the button I set:
BindingField = lValidated
BindingProperty = Enabled
BindingUpdateMode = Never
BusinessObject = boParticipants
ControlSourceUpdate = OnPropertyChanged

And I turned then little error arrows off

I took some of it from other posts. Oh, and I know I could use an IIF() instead of If..then. One thing I like is that all the logic is in the Business Object.

Thanks

Marcel

By Trent L. Taylor - 1/27/2008

OK...what you did will work, but it may be more energy than you really need to implement...especially to reproduce over and over again.

First, if the update mode is set to OnPropertyChanged, and the BO does not show the changes in the OnTextChanged event, then it is a matter of handler order. In other words, the TextChanged event that you are handling is being fired BEFORE the base. If you want to prove this, create a MyTextBox class, inherit the SF TextBox, then override the OnTextChanged event and place your code AFTER the MyBase.OnTextChanged call. This should then prove where the issue was and then you can start to work the problem so that it may be easier to implement this same logic in the future.