control_requiredfieldvalidator.asp

W3Schools tutorial..web designing

    <td valign="top">normal<br />
    small<br />
    large</td>
    <td valign="top">Optional. Specifies the font size of the text in the 
    control</td>
  </tr>
    <tr>
    <td valign="top">id</td>
    <td valign="top">unique_name</td>
    <td valign="top">Optional. A unique id for the control</td>
    </tr>
    <tr>
    <td valign="top">InitialValue</td>
    <td valign="top">initial_value</td>
    <td valign="top">Optional.

Specifies the starting value of the input control. Default value is null</td>
    </tr>
    <tr>
    <td valign="top">runat</td>
    <td valign="top">&quot;server&quot;</td>
    <td valign="top">Required. Specifies that the control is a server control</td>
    </tr>
  <tr>
    <td valign="top">StyleReference</td>
    <td valign="top">name_of_style_element</td>
    <td valign="top">Optional. Specifies a reference to a style to be applied to 
    the control</td>
  </tr>
    <tr>
    <td valign="top">Text</td>
    <td valign="top">errortext</td>
    <td valign="top">Optional. The message to display when validation fails</td>
    </tr>
  <tr>
    <td valign="top">Wrapping</td>
    <td valign="top">wrap<br />
    nowrap</td>
    <td valign="top">Optional. Specifies whether or not the text in the control should wrap</td>
  </tr>
  </table>

<h3>Example 1</h3>
<p>The following example contains two forms in an .aspx file. The first form has 
a label with the text &quot;Please enter a number from 1 through 100&quot;, an input box to input 
a number, a RangeValidator control that checks that the input value is a number 
from 1 through 100, a RequiredFieldValidator control that checks that the input 
field isn't empty, 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:</p>
<table class="ex" width="100%" border="1">
  <tr>
    <td>
    <pre>&lt;%@ Page 
Inherits=&quot;System.Web.UI.MobileControls.MobilePage&quot;%&gt;
&lt;%@ Register TagPrefix=&quot;Mobile&quot;
Namespace=&quot;System.Web.UI.MobileControls&quot;
Assembly=&quot;System.Web.Mobile&quot; %&gt;</pre>
    <pre>&lt;script runat=&quot;server&quot;&gt;
sub page2(Sender as Object,E as EventArgs)
if Page.IsValid then
  ActiveForm=f2
  lbl2.Text=&quot;You entered number &quot; &amp; txt1.text
end if
end sub
&lt;/script&gt;

&lt;Mobile:Form id=&quot;f1&quot; runat=&quot;server&quot;&gt;
  &lt;Mobile:Label runat=&quot;server&quot;&gt;
  Please enter a number from 1 through 100
  &lt;/Mobile:Label&gt;</pre>
    <pre>  &lt;Mobile:TextBox id=&quot;txt1&quot; runat=&quot;server&quot;/&gt;</pre>
    <pre>  &lt;Mobile:RangeValidator
  ControlToValidate=&quot;txt1&quot;
  Type=&quot;Integer&quot;
  MaximumValue=&quot;100&quot;
  MinimumValue=&quot;1&quot;
  Text=&quot;Invalid number&quot;
  runat=&quot;server&quot; /&gt;</pre>
    <pre>  &lt;Mobile:RequiredFieldValidator
  ControlToValidate=&quot;txt1&quot; 
  Text=&quot;A number is required&quot;
  runat=&quot;server&quot; /&gt;</pre>
    <pre>  &lt;Mobile:Command runat=&quot;server&quot;
  OnClick=&quot;page2&quot;&gt;Submit
  &lt;/Mobile:Command&gt;
&lt;/Mobile:Form&gt;</pre>
    <pre>&lt;Mobile:Form id=&quot;f2&quot; runat=&quot;server&quot;&gt;
  &lt;Mobile:Label id=&quot;lbl2&quot; runat=&quot;server&quot; /&gt;
&lt;/Mobile:Form&gt;</pre>
    </td>
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</table>

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