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How to pass parameters in return url of vf page:

I am sending parameters in rturn url like below:
<apex:commandLink onclick="window.open('/{!list.Id}/e?retURL=apex/Mypage?id={!Event.Id}&{!parameter}')" value="Edit" id="edit"/>

after doing some action on standard page I want to return back to my vf page with some parameters but it is returning just one parameters not others like:

but I need this url:
/apex/Mypage?id={!Event.Id}&{!parameter}'Here parameter is string

If you url encode it first then you can add those parts.  So your url becomes
<apex:commandLink onclick="window.open('/{!list.Id}/e?retURL=apex%2FMypage%3Fid%3D{!Event.Id}%26{!parameter}')" value="Edit" id="edit"/>

It might be easier (and safer if {!parameter} may contain non-alpha chars to use EncodingUtils methods inside of the controller and generate an encoded string that is then inserted in the VF page.
Ken KoellnerKen Koellner
I had to do the same thing.  Do what pcon suggests. you have to URL encode the ? and & of the retURL or they get taken by the original window.open URL.