My live agent is working fine.
- But i want to add captcta in live agent pre chat form. But i am not using controller for live agent, so is it possible ?
Any suggestions please ?
No this is not possible. One of my friend had similar requirement, he logged a case with support and were came to know tht its not feasible.
You can get idea from this article (https://iwritecrappycode.wordpress.com/2013/10/29/salesforce-live-agent-review-customization/)
I mean that you can try to create VF page with form where submit button will not submit form but will execute some javascript code within which you can use @RemoteActions to contact with appropriate controller. After all javascript logic form will be submitted by executing
document.forms["yourFormName"].submit();
command.
Hope this helps.