Getting current selection in objective c using WebKit framework?

Is there any method available in WebKit framework which tells that user has clicked on a particular button of the the web page or user clicked on 开发者_开发百科some link.I want to perform some action when user clicks on a button of a webpage,but i am not able to identify that that user clicked on a button.I searched a lot but i am not able to find such method.Please help!

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Set the UI delegate and the policy delegate via [webView setUIDelegate:] and [webView setPolicyDelegate:], and implement the delegate methods explained in Web UI delegate protocol reference and in Web Policy delegate protocol reference.

Look for webView:mouseDidMoveOverElement:modifierFlags: in the UI delegate and webView:decidePolicyForNavigationAction:request:frame:decisionListener: in the policy delegate to achieve what you want to do.