<Captcha>

The Captcha tag renders as a CAPTCHA control at run time.

NOTE: Due to a limitation in the underlying DNN CAPTCHA control, this tag can only be used in the FormView module.

Syntax

<Captcha


    BackColor="color name|#dddddd" 
    BackgroundColor="color name|#dddddd" 
    BackgroundImage="url" 
    BorderColor="color name|#dddddd" 
    BorderStyle="NotSet|None|Dotted|Dashed|Solid|Double|Groove|Ridge|         Inset|Outset" 
    BorderWidth="size" 
    CaptchaChars="string"
    CaptchaHeight="size"
    CaptchaLength="integer"
    CaptchaWidth="size"
    CssClass="string" 
    ErrorMessage="string"
    
    ErrorStyle-BackColor="color name|#dddddd"
    ErrorStyle-BorderColor="color name|#dddddd"
    ErrorStyle-BorderStyle="NotSet|None|Dotted|Dashed|Solid|Double|Groove|Ridge|Inset|OutSet"
    ErrorStyle-BorderWidth="size"
    ErrorStyle-Font-Bold="True|False"
    ErrorStyle-Font-Italic="True|False" 
    ErrorStyle-Font-Names="string" 
    ErrorStyle-Font-Overline="True|False" 
    ErrorStyle-Font-Size="string|Smaller|Larger|XX-Small|X-Small|Small|Medium|         Large|X-Large|XX-Large" 
    ErrorStyle-Font-Strikeout="True|False" 
    ErrorStyle-Font-Underline="True|False" 
    ErrorStyle-ForeColor="color name|#dddddd" 
    Expiration="integer"
    Font-Bold="True|False" 
    Font-Italic="True|False" 
    Font-Names="string" 
    Font-Overline="True|False" 
    Font-Size="string|Smaller|Larger|XX-Small|X-Small|Small|Medium|         Large|X-Large|XX-Large" 
    Font-Strikeout="True|False" 
    Font-Underline="True|False" 
    ForeColor="color name|#dddddd" 
    Height="size" 
    ID="string" 
    Text="string"
    Width="size"

/>

Remarks

If your forms are available to the public, chances are you'll get web 'bots filling in those forms with bogus information. To help protect against this, you can add a CAPTCHA control to your form. The control attempts to prove the user is an actual human by asking them to view a series of characters and typing those characters into a box for verification. The characters are rendered as an image and are skewed and obfuscated so that (hopefully) only a human could read them. While it is no guarantee your forms won't get spammed, the control typically reduces the frequency of those attacks.

BackColor: Color of the background of the control.
BackgroundImage: A URL to an image file to use as the background on which the characters will be placed. (optional)
BorderColor: Color of the border around the control
BorderStyle: Style of the border around the control.
BorderWidth: Width of the border around the control, specified in units
CaptchaChars: If you wish to specify your own characters that will be used to make up the code the user must type, you can specify them in this property.
CaptchaHeight: The height of the area in which the characters will be displayed.
CaptchaLength: The number of characters to use for the code.
CaptchaWidth: The width of the area in which the characters will be displayed.
CssClass: Name of the Cascading Style Sheets (CSS) class used to style this control
ErrorMessage: The message to display to the user if captcha validation failed.
ErrorStyle: The style to use for displaying the error message. ErrorStyle is specified using the following syntax: ErrorStyle-styleAttributeName where 'styleAttributeName' is the name of the style attribute such as ForeColor or Font-Bold. See the syntax section above for more.
Font Properties: A series of attributes such as font-bold, font-size, etc. that allow you to control how the text in the control is displayed. More
ForeColor: Sets the foreground color (typically the color of the text) of the control.
Height: Height of the control, specified in units.
ID: Name, consisting of letters and numbers, beginning with a letter, that uniquely identifies the control within the form.
Width: Width of the control in units.

Example

<addform>
  ...
  <table>
    <tr>

      
 <td>

        
 <label for="txtFirstName" text="First Name" />

        <textbox id="txtFirstName" datafield="FirstName" 
 datatype="string" />

      
 </td>

</tr>
<tr>

      
 <td>

        
 <label for="txtLastName" text="First Name" />

        <textbox id="txtLastName" datafield="LastName" 
 datatype="string" />

      
 </td>

    </tr>
    <tr>
      <td>
        <captcha captchalength="5" />
      </td>
    </tr>

<tr>

      
 <td colspan="2">

        
 <addbutton text="Add"/>&nbsp;<cancelbutton 
 text="Cancel"/>

      
 </td>

</tr>
</table>
</addform>