I found a small hole in an application I am developing where a null value in a textbox bound to an integer value wouldn’t get validated. It was slightly more complicated than that however. The xaml was as follows; Where my Validation was set for when the control lost focus. When I added a new [...]
While working on an Application for a Client recently, I found that I needed to be able to control the visibility of the WPF Error Adorners. These error adorners are a great way of giving the end user a visual representation of where any Validation Errors exist. However, as a result of their design, these [...]
While developing a shopping cart function for a client, I needed to restrict the user to entering numbers only in an Input fieldI came across this handy post;http://www.itjungles.com/javascript/how-to-use-javascript-to-force-numeric-value-in-textboxBasically, we need to add the following function to the JavaScript section; function isNumericKey(evt){ var charCode = (evt.which) ? evt.which : event.keyCode if (charCode > 31 && (charCode [...]
In an application I am developing, I required that two checkboxes be validated together, when either one of them were clicked. I also needed to only show the Validation error once in my Error Message Box. To achieve this we first call the OnPropertyChanged routine, which in turn raises the PropertyChanged event, for each linked [...]
In order to validate an email address, use the following function; Public Function IsValidEmailAddress(ByVal EmailAddress As String) As Boolean Dim Expression As New System.Text.RegularExpressions.Regex("S+@S+.S+") If EmailAddress = "" Then Return True Else Return Expression.IsMatch(EmailAddress) End If End Function
