Captcha Control

• Aug 09, 2019
• 2 minutes to read

The ASPxCaptcha is a CAPTCHA (Completely Automated Public Turing test to tell Computers and Humans Apart) control used to verify that submitted data come from a human and not a robot or script.

ASPxCaptcha offers the following features:

• Customizable Element Visibility and Appearance

  The following table lists the properties that define captcha elements visibility and appearance

  Members	Description
  ASPxCaptcha.ChallengeImage	Gets the image settings displayed within the challenge image element.
  ASPxCaptcha.LoadingPanel	Gets the settings of the captcha editor’s loading panel.
  ASPxCaptcha.RefreshButton	Gets the settings of the captcha editor’s refresh button.
  ASPxCaptcha.TextBox	Gets the settings of the captcha editor’s text box.

• Customizable Error Message

  When an end-user inputs a wrong code, an error message is displayed. You can modify the displayed message using the CaptchaValidationSettings.ErrorText property.

• Customizable Character Set

  You can use the ASPxCaptcha.CharacterSet property to define the set of characters used by the editor to generate the code displayed in a challenge image.

• Customizable Code Length

  The ASPxCaptcha.CodeLength property allows you to define the number of characters displayed within the editor’s challenge image.

• Various Font Families

  The CaptchaImageProperties.FontFamily property allows you to define the desired font that will be used in the challenge image: Verdana, Times New Roman, Georgia, Courier New.

• Various Font Styles

  The CaptchaImageProperties.FontStyle property allows you to define the style that will be applied to the font: Regular, Italic or Bold.

• Full-Featured Client-Side API

  ASPxCaptcha provides you with a comprehensive client-side API. This API is implemented using JavaScript and is exposed via the ASPxClientCaptcha object. The ASPxClientCaptcha object serves as a client-side equivalent of the ASPxCaptcha control.

  You can modify the editor behavior using the following methods.

  Method	Description
  ASPxClientCaptcha.Focus	Sets input focus to the control’s text box.
  ASPxClientCaptcha.Refresh	Refreshes the code displayed within the editor’s challenge image.

• Web Gardens Support

  The ASPxCaptcha control supports the IIS clustered web environment (also known as Web Farms or Web Gardens). To learn more, see the Binary Storage Configuration topic.