.NET Mobile Input Validation

Validation Controls are used to validate the data entered by a user.

Validation Controls

Validation controls are used to validate the data entered by a user.

Validation controls allow you to validate an input control (like a TextBox), and display a message when validation fails.

Each validation control performs a specific type of validation (like validating against a specific value or a range of values).

By default, page validation is performed when a command control is clicked. You can prevent validation when a control is clicked by setting the CausesValidation property to false.

Validating Input

This page has two forms:

<%@ 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
  text2.Text="You are " & age.text & " years old"
end if
End Sub

</script>

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

<Mobile:CompareValidator runat="server"
  ControlToValidate="age"
  Type="Integer"
  ValueToCompare="18"
  Operator="GreaterThanEqual">
You must be at least 18
</Mobile:CompareValidator>

<Mobile:Label runat="server">Age?</Mobile:Label>
<Mobile:TextBox id="age" runat="server" />
<Mobile:Command OnClick="Page2" runat="server">
Submit</Mobile:Command>
</Mobile:Form>

<Mobile:Form id="f2" runat="server">
<Mobile:Label id="text2" runat="server" />
</Mobile:Form>

The first form has a label with the text "Age?", an input box to input the age, and a submit button.

The second page is activated by the submit button on the first page, and displays a response.

If the input validates as error, an error message is displayed.

When the application runs on a mobile device, the two pages will display like this:

Form 1

Form 2

The ValidationSummary Control

The previous example used a CompareValidator control to validate an input field. The field to validate was defined by the attribute ContolToValidate.

You can also use a ValidationSummary control with the attribute FormToValidate, to validate all the input of a form.

This way you can display a summary of errors instead of one error at the time.

Validation Controls Reference

For a full control reference, including properties methods, events, and more examples, please refer to the "Mobile Reference" page.

Jump to: Top of Page or HOME or Printer friendly page

Search W3Schools:

What Others Say About Us

Does the world know about us? Check out these places:

Dogpile Alta Vista MSN Google Excite Lycos Yahoo Ask Jeeves

We Help You For Free. You Can Help Us!

• Tell your newsgroup or mailing list
• Link to us from your pages
• Help us correct errors and broken links
• Help us with spelling and grammar
• Validate the XHTML code of this page

W3Schools is for training only. We do not warrant its correctness or its fitness for use. The risk of using it remains entirely with the user. While using this site, you agree to have read and accepted our terms of use and privacy policy.

Copyright 1999-2002 by Refsnes Data. All Rights Reserved

How we converted to XHTML