ValidationSettings.EnableCustomValidation Property

Gets or sets a value that specifies whether an error frame should be rendered on the client side when you implement a custom validation.

Namespace : DevExpress.Web

Assembly : DevExpress.Web.v25.2.dll

NuGet Package : DevExpress.Web

Declaration

C#
VB.NET

csharp

[DefaultValue(false)]
public bool EnableCustomValidation { get; set; }

<DefaultValue(False)>
Public Property EnableCustomValidation As Boolean

Property Value

Type	Default	Description
Boolean	false

true to render an error frame; otherwise, false.

Property Paths

You can access this nested property as listed below:

Object Type	Path to EnableCustomValidation
ASPxEdit

.ValidationSettings .EnableCustomValidation

| | EditProperties |

.ValidationSettings .EnableCustomValidation

Remarks

An error frame is automatically rendered on the client side in the following situations.

The ASPxClientEdit.Validation or ASPxEdit.Validation event is handled.
The ValidationSettings.RequiredField or ValidationSettings.RegularExpression property is specified.
The ASPxEdit.IsValid property is initially set to false

Otherwise, being unnecessary, the error frame is not rendered to the client side.

However, in some scenarios, you need to perform the editor’s the entire validation yourself, without using any predefined validation capabilities. In these cases, set the EnableCustomValidation property to true to force the editor to render the error frame to the client side.

Example

The code sample below implements custom validation without using any predefined validation capabilities. Note that you should set the ValidationSettings.EnableCustomValidation property to true to show an error frame.

javascript

function OnAgeValidation(s, e) {
     var age = tbAge.GetText();
     if (age == null || age == "")
          return;
     var digits = "0123456789";
     for (var i = 0; i < age.length; i++) {
          if (digits.indexOf(age.charAt(i)) == -1) {
               tbAge.SetIsValid(false);
               break;
          }
     }
     if (tbAge.GetIsValid() && age.charAt(0) == '0') {
          age = age.replace(/^0+/, "");
          if (age.length == 0)
               age = "0";
          tbAge.SetText(age);

     }
     if (age < 18) {
          tbAge.SetIsValid(false);
          tbAge.SetErrorText('Age must be greater than or equal 18');
     }
}

ASPX

aspx

<dx:ASPxTextBox ID="ASPxTextBox1" runat="server" Width="170px" ClientInstanceName="tbAge">
     <ValidationSettings ValidateOnLeave="False" EnableCustomValidation="True">
     </ValidationSettings>
</dx:ASPxTextBox>

<dx:ASPxButton ID="btnValidate" runat="server" AutoPostBack="False" Text="Validate">
     <ClientSideEvents Click="OnAgeValidation" />
</dx:ASPxButton>