I get the code from the site for submitting the email address and click on "GO" button. But i want to apply:
1. Client side required field validation
2. If passes point 1 then open a captcha type popup which says something like 2+3=?
3. If passes the point 2 then redirect to our thank you page and if we see the constant contact list by login that enetered email address should be there.
Is it possible to achive this as i am using classic asp in my website
Unfortunately it isn't possible to do this with the join my mailing list code that's generated within your account. The code that takes a user to the registration form by pressing the GO button is non-editable.
However, if you'd like to implement this by using your own add contact code using our API, you could set the captcha and subsequent registration form up on your side and use the API to add the contact to the approvpriate list(s) in your account. We have a wrapper and sample 'add contact' code available in .NET and PHP if you're interested.
API Support Specialist