Filter jqGrid by multiple conditions

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Javascript

JQGrid

I want to programmatically filter records in jqgrid based on multiple conditions. All the data is loaded at client side using "loadonce: true" and there is no paging.

For instance, the grid have two columns "Name" and "ID". I want to filter all rows which have value in column "Name" starting with "ar" and also the "ID" column should have value in (1, 5, 6)

I can filter the grid on either of the above two conditions but not able to join both of them.

I want to do something like this:

jQuery.extend(postdata, {
            filters: {[
                "groupOp": "or",
                "rules": filterArray],

                ["groupOp": "and",
                "rules": filterArray
                ]
            }
});

To summarize my question, I just want to convert the following sql condition into equivalent jqGrid filter:

where (userName like '%john%' OR userName = "") and userID in (1,2, 3)