当前位置: 首页 > 网络学院 > 服务端脚本教程 > .NET Mobile > .NET Mobile Input Validation

.NET Mobile
.NET Mobile Introduction
.NET Mobile Example
.NET Mobile Emulators
.NET Mobile Forms
.NET Mobile Events
.NET Mobile Input
.NET Mobile Input Validation
.NET Mobile Lists
.NET Mobile Selections
.NET Mobile Images
.NET Mobile Utilities
ASP.NET Mobile Controls Reference

.NET Mobile Input Validation


出处:互联网   整理: 软晨网(RuanChen.com)   发布: 2009-07-31   浏览: 736 ::
收藏到网摘: n/a

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

Age?



Form 2

You are 21 years old






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.

评论 (3) 1 All

登陆 | 还没注册?