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Please suggest possible techniques to trigger events in parent page from an iFrame. I tried out url Hashing and using window.postMessage techniques but without any success.
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No success because you cannot for security reasons.
The modern answer to this question is the new cross-document messaging (Web Messaging API)
See Opera's introduction here:
http://dev.opera.com/articles/view/window-postmessage-messagechannel/
Or the specification here: http://www.w3.org/TR/webmessaging/
easyXDM is designed for this exact purpose. You can find it at http://easyxdm.net and it has quite a few examples.
To sum it up, it allows two windows to communicate 'freely' using either strings or RPC calls.
See http://consumer.easyxdm.net/current/example/methods.html for one of the RPC-demos.
The only idea that comes to mind is to have a script on server side that the iFrame sends its events to (combined with a unique ID) and that the parent page can poll (either through a server script on its domain, or JSONP). That's a lot of work to do, though, and requires cooperation from both the parent page and the iframe.