Javascript Captcha

[Howdy_McGee]

I tried just making 2 random number generators and then checking the sums against the 2 random numbers sums, but apparently spambots can do maths. Can it be done by checking the alt tag/title tag/img name against user input as a "Captcha"?

[wirehopper]

For CAPTCHA to work, the server has to check the value submitted against what it expects.This is a nice solution.http://www.google.com/recaptcha

[Ingolme]

Since spambots don't run Javascript whatsoever, Javascript is a great way to stop them. All you need to do is dynamically create the entire form using document.createElement() and other DOM methods.So why isn't this technique more common? Because developers care about accessibility. Not all browsers use Javascript and some people like to navigate with Javascript disabled.

[justsomeguy]

Since spambots don't run Javascript whatsoever, Javascript is a great way to stop them.

I wouldn't necessarily rely on that. There are enough open-source engines and enough commercial malware products that eventually the two might intersect.

[jeffman]

CAPTCHA modules that plug into PHP or ASP.NET are so common today there is almost no reason not to use them. Find one with a clear explanation, and installing it should be easy even if you know little about server-side environments.

[ApocalypeX]

Not all browsers use Javascript and some people like to navigate with Javascript disabled.

Hate those people.

[[dx]]

Also those which are using IE.

[Ingolme]

Hate those people.

There's a lot of paranoia about Javascript, especially because of the fact that many sites misuse it. Firefox has an add-on called "NoScript" and it's quite popular.