Comments on: Simple Visualforce Captcha http://www.tehnrd.com/simple-visualforce-captcha/ Force.com - jQuery - Technology - Life Sun, 05 Feb 2012 03:04:17 +0000 hourly 1 http://wordpress.org/?v=3.1.2 By: DK http://www.tehnrd.com/simple-visualforce-captcha/comment-page-1/#comment-4725 DK Wed, 23 Mar 2011 21:19:11 +0000 http://www.tehnrd.com/?p=156#comment-4725 Can i use this in the web to lead form ... Can i use this in the web to lead form …

]]> By: Johan Liljegren http://www.tehnrd.com/simple-visualforce-captcha/comment-page-1/#comment-715 Johan Liljegren Tue, 30 Mar 2010 20:20:16 +0000 http://www.tehnrd.com/?p=156#comment-715 You rock, Jason. Keep up the quality code and demos - I'm learning a lot! You rock, Jason. Keep up the quality code and demos – I’m learning a lot!

]]> By: Paul Fox http://www.tehnrd.com/simple-visualforce-captcha/comment-page-1/#comment-713 Paul Fox Tue, 30 Mar 2010 18:29:07 +0000 http://www.tehnrd.com/?p=156#comment-713 I love the idea, and it's definitely much simpler. However, I think Rob has a very valid point. It would be pretty easy to upload a handful of images as static resources and then just randomly choose one to show up. You could use a case function based on the image name to match the captcha image with the correct text. Just make sure the image name doesn't include the text since that could be read in the HTML also. I love the idea, and it’s definitely much simpler. However, I think Rob has a very valid point. It would be pretty easy to upload a handful of images as static resources and then just randomly choose one to show up. You could use a case function based on the image name to match the captcha image with the correct text. Just make sure the image name doesn’t include the text since that could be read in the HTML also.

]]> By: Jeff Douglas http://www.tehnrd.com/simple-visualforce-captcha/comment-page-1/#comment-711 Jeff Douglas Mon, 29 Mar 2010 20:41:24 +0000 http://www.tehnrd.com/?p=156#comment-711 Bookedmarked! Will definitely use in the future. Thanks! Bookedmarked! Will definitely use in the future. Thanks!

]]> By: Jason http://www.tehnrd.com/simple-visualforce-captcha/comment-page-1/#comment-710 Jason Mon, 29 Mar 2010 20:08:52 +0000 http://www.tehnrd.com/?p=156#comment-710 True, but to my credit it is labeled as a "Simple" CAPTCHA. I don't think a spam-bot can copy and paste in a traditional sense. It would have to crawl the DOM and identify only the black characters to paste, styleClass="blackChar". To add more security you could create random class names and pass these to the style names and styleClass attributes. You could also wrap the letters in several layers of DIVs and SPANs and then render these randomly to make DOM traversing even more difficult. No CAPTCHA is perfect but considering the simplicity of this one, it works pretty well. True, but to my credit it is labeled as a “Simple” CAPTCHA. I don’t think a spam-bot can copy and paste in a traditional sense. It would have to crawl the DOM and identify only the black characters to paste, styleClass=”blackChar”. To add more security you could create random class names and pass these to the style names and styleClass attributes. You could also wrap the letters in several layers of DIVs and SPANs and then render these randomly to make DOM traversing even more difficult.

No CAPTCHA is perfect but considering the simplicity of this one, it works pretty well.

]]> By: Rob http://www.tehnrd.com/simple-visualforce-captcha/comment-page-1/#comment-709 Rob Mon, 29 Mar 2010 19:56:44 +0000 http://www.tehnrd.com/?p=156#comment-709 Hmm...I think you'd want the CAPTCHA to show up in an image, not as selectable text. It's pretty easy to create a spam-bot that can cut-and-paste... Cool idea, though! :) Hmm…I think you’d want the CAPTCHA to show up in an image, not as selectable text. It’s pretty easy to create a spam-bot that can cut-and-paste…

Cool idea, though! :)

]]> By: Jason http://www.tehnrd.com/simple-visualforce-captcha/comment-page-1/#comment-230 Jason Tue, 20 Oct 2009 16:07:49 +0000 http://www.tehnrd.com/?p=156#comment-230 Yup, Math.Random() returns a random value greater than 0.0 and less than 1.0 which you then multiply by your range. You can then round it to get the whole number. Yup, Math.Random() returns a random value greater than 0.0 and less than 1.0 which you then multiply by your range. You can then round it to get the whole number.

]]> By: amir hafeez http://www.tehnrd.com/simple-visualforce-captcha/comment-page-1/#comment-229 amir hafeez Tue, 20 Oct 2009 15:54:12 +0000 http://www.tehnrd.com/?p=156#comment-229 Really cool is that how u get a random number from apex? math.random * range Really cool is that how u get a random number from apex? math.random * range

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