I hope after examin this examples you could impement what you want.
To your other question. Parameter postData is very usefull if you want send additional information from the client to the server. For example url: “http://my.com/Svc”, postData: {country: “Germany”, langage: “german”} in case of HTTP GET requests follow to usage of url like http://my.com/Svc?country=“Germany”&langage=”german”. In case of HTTP POST request the data from postData will be placed to the HTTP body.
Usage of userData is a standard way to send an additional information from the server to jqGrid (see /jqgridwiki/doku.php?id=wiki:retrieving_data#user_data). jqGrid knows the parameter and save tha data as a part of internaldata. To get the data later from the jqGrid you can use jQuery(“grid_id”).getGridParam('userData').
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