.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>
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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
| Name |
Function |
| CompareValidator |
Compares two values |
| CustomValidator |
Provides custom validation |
| RangeValidator |
Validates a range |
| RegularExpressionValidator |
Validates an expression |
| RequiredFieldValidator |
Validates required data |
| ValidationSummary |
Displays a validation summary |
For a full control reference, including properties methods, events, and
more examples, please
refer to the "Mobile Reference" page.
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