BotDetect CAPTCHA Crash Course

On this page we demonstrate how easy it is to integrate BotDetect Captcha in your forms.

We'll use default BotDetect settings; to see how powerful and customizable BotDetect is, check the BotDetect features demo.

1. Copy Captcha Library Files

Copy BotDetect.asp and the BotDetect folder to your application. These files (and a code sample made by following these instructions, named "Basic CAPTCHA sample") are included in the BotDetect installation.

2. Show a Captcha Challenge on the Form

On the ASP Classic form you want to protect against bots, add: 
  <!-- #include file ="BotDetect.asp" -->
</head>

  […]

<% ' Adding BotDetect Captcha to the page 
  Dim SampleCaptcha : Set SampleCaptcha = (New Captcha)("SampleCaptcha")
  SampleCaptcha.UserInputID = "CaptchaCode"
  Response.Write SampleCaptcha.Html
%>

<input name="CaptchaCode" id="CaptchaCode" type="text" />

3. Check User Input During Form Submission

When the form is submitted, the Captcha validation result must be checked: 
<% If Request.ServerVariables("REQUEST_METHOD") = "POST" Then
  
  ' validate the Captcha to check we're not dealing with a bot
  Dim isHuman : isHuman = SampleCaptcha.Validate()
  
  If Not isHuman Then 
    ' TODO: Captcha validation failed, show error message
  Else 
    ' TODO: Captcha validation passed, proceed with protected action
  End If 
  
End If %>

BotDetect CAPTCHA Options

To find more about configuring BotDetect and integrating it in various usage scenarios, please check the getting started with BotDetect Captcha page.

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