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<h1>.NET Mobile Input Validation</h1>
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<p class="intro">Validation Controls are used to validate the data entered by a user.</p>
<hr />
<h2>Validation Controls</h2>
<p>Validation controls are used to validate the data entered by a user.</p>
<p>Validation controls allow you to validate an input control
(like a TextBox), and display a message when validation fails.</p>
<p>Each validation control performs a specific type of validation (like
validating against a specific value or a range of values).</p>
<p>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.</p>
<hr />
<h2>Validating Input</h2>
<p>This page has two forms:</p>
<table width="100%" border="1" class="ex" cellspacing="0">
<tr>
<td>
<pre><%@ Page
Inherits=
"System.Web.UI.MobileControls.MobilePage"%>
<%@ Register
TagPrefix="Mobile"
Namespace="System.Web.UI.MobileControls"
Assembly="System.Web.Mobile" %></pre>
<pre><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"></pre>
<pre><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>
</pre>
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<p>The first form has a label with the text "Age?", an input box
to input the age, and a submit button.</p>
<p>The second page is activated by the submit button on the first
page, and displays a response.</p>
<p>If the input validates as error, an error message is displayed.</p>
<p>When the application runs on a mobile device, the two pages will display like this:</p>
<p>Form 1</p>
<table border="1" width="200" cellpadding="5">
<tr>
<td>
Age?<br />
<input type="text" name="age" size="20" /><br />
<input type="submit" value="Submit" />
<br /><br /><br />
</td>
</tr>
</table>
<p>Form 2</p>
<table border="1" width="200">
<tr>
<td>You are 21 years old<br /><br /><br />
<br /><br /><br /><br />
</td></tr>
</table>
<br />
<hr />
<h2>The ValidationSummary Control</h2>
<p>The previous example used a CompareValidator control to validate an input
field. The field to validate was defined by the attribute ContolToValidate.</p>
<p>You can also use a ValidationSummary control with the attribute
FormToValidate, to validate all the input of a form. </p>
<p>This way you can display a summary of errors instead of one error at the
time.</p>
<hr />
<h2>Validation Controls Reference</h2>
<table border="1" width="100%" class="ex">
<tr>
<th align="left">Name</th>
<th align="left">Function</th>
</tr>
<tr>
<td>CompareValidator</td>
<td>Compares two values</td>
</tr>
<tr>
<td>CustomValidator</td>
<td>Provides custom validation</td>
</tr>
<tr>
<td>RangeValidator</td>
<td>Validates a range</td>
</tr>
<tr>
<td>RegularExpressionValidator</td>
<td>Validates an expression</td>
</tr>
<tr>
<td>RequiredFieldValidator</td>
<td>Validates required data</td>
</tr>
<tr>
<td>ValidationSummary</td>
<td>Displays a validation summary</td>
</tr>
</table>
<p>For a full control reference, including properties methods, events, and
more examples, please
refer to the "Mobile Reference" page.</p>
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