CodingFX.com Code Library

CAPTCHA Test

Description: A free CAPTCHA test using the ASPImage component. It generates the images dynamically using a combination of letters and numbers. View an example here.
Author: Andrew Stevens
Posted: 4/26/2006
Download: downloads/CAPTCHA.zip
Code:

Free CAPTCHA Test using ASPImage
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Andrew Stevens
andrew@codingfx.com
http://www.codingfx.com
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Installation
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Extract all the files in the zip file

Add the following code to the page you wish to have the CAPTCHA test on.

example_form.asp is an example if you need any more help.

1. Add this at the top:

2. Add the check to see if the CAPTHCA passed by using  CaptchaCheck = "Pass"

Here is an example:

<%
If Request.Form > "" then
	If CaptchaCheck = "Pass" Then
		Response.Write "Success!"
	End If
End If
%>

3. Add this in the <head> of the file.

4. Make sure that the <form> has method="post" and the action doesn't lead to another page.  The CAPTHCA won't work if the action leads somewhere else.

5. Add this code to the desired part of your form.  Make sure it is between the <form> and </form> tags.

--CAPTCHA Code Below---

Please enter the code shown below:<br>
<input type="textbox" name="captcha" size="7" autocomplete="off"><br><br>
<div id="captchacontainer"><% Call GetCaptcha(strCharacters) %></div><a href="javascript:reloadCaptcha();">reload</a>
<%
response.write Session("CAPTCHA_Message")
Session("CAPTCHA_Message") = ""
%>

--CAPTCHA Code Above--

6. Another good thing to do would be to have each item in your form to have its default value to <%=Request.Form("field name here")%>.  That way if they get the code wrong, they won't lose all the values in their form.

Example:

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If you need more help with this, feel free to post on the support forum at http://www.codingfx.com/cfx/forum