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ASP.NET Mobile CustomValidator Control


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Definition and Usage

The CustomValidator control allows you to write a method to handle the validation of the value entered.


Properties

Property Value Description
Alignment left
center
right
Optional. How to align the control
BackColor rgb(x,x,x)
#xxxxxx
colorname
Optional. A background color for the control
ControlToValidate id_of_target_control Optional. The id of the control to validate
Display None
Static
Dynamic
Optional. The display behavior for the validation control. Legal values are:
  • None (the control is not displayed. Used to show the error message only in the ValidationSummary control)
  • Static (the control displays an error message if validation fails. Space is reserved on the page for the message even if the input passes validation
  • Dynamic (the control displays an error message if validation fails. Space is not reserved on the page for the message if the input passes validation

Dynamic is default

ErrorMessage errortext_for_summary Optional. The text to display in the ValidationSummary control when validation fails
ForeColor rgb(x,x,x)
#xxxxxx
colorname
Optional. A foreground color for the control
Font-Bold false
true
Optional. Specifies whether or not the text in the control should be bold
Font-Italic false
true
Optional. Specifies whether or not the text in the control should be italic
Font-Name fontname Optional. Specifies the font name of the text in the control
Font-Size normal
small
large
Optional. Specifies the font size of the text in the control
id unique_name Optional. A unique id for the control
OnServerValidate function_name Optional. Specifies the name of the server-side validation script function to be executed
runat "server" Required. Specifies that the control is a server control
StyleReference name_of_style_element Optional. Specifies a reference to a style to be applied to the control
Text errortext Optional. The message to display when validation fails
Wrapping wrap
nowrap
Optional. Specifies whether or not the text in the control should wrap

Example 1

The following example contains two forms in an .aspx file. The first form has a label with the text "Please enter a username", an input box to input a username, a CustomValidator control that checks that the input value is between 8 and 16 characters, and a submit button. The second page is activated by the submit button on the first page, and displays a response. If the input value validates as an error, an error message is displayed:

<%@ Page
Inherits="System.Web.UI.MobileControls.MobilePage"%>
<%@ Register TagPrefix="Mobile"
Namespace="System.Web.UI.MobileControls"
Assembly="System.Web.Mobile" %>

<script runat="server">
Sub Page2(Sender as Object,E as EventArgs)
If Page.IsValid Then
  ActiveForm=f2
  txt2.Text="Your username is: " & txt1.text
end if
End Sub

Sub user(source As object,args As ServerValidateEventArgs)
  if len(args.Value)<8 or len(args.Value)>16 then
    args.IsValid=false
  else
    args.IsValid=true
  end if
End Sub
</script>

<Mobile:Form id="f1" runat="server">

<Mobile:Label runat="server">
  Please enter a username
  </Mobile:Label>

<Mobile:TextBox id="txt1" runat="server" />

<Mobile:CustomValidator runat="server"
  ControlToValidate="txt1"
  OnServerValidate="user"
  Text="A username must be between 8 and 16 characters!" />

  <Mobile:Command OnClick="Page2" runat="server">
  Submit</Mobile:Command>

</Mobile:Form>

<Mobile:Form id="f2" runat="server">
  <Mobile:Label id="txt2" runat="server" />
</Mobile:Form>

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