jqGrid sorting on client side

Question

I have a tree-grid with autoloading rows. The goal is to sort the grid by tree column, right on client side.

But each time I click on sort column he

Answer 1

$(function () {
        $("#list").jqGrid({
            url: '/Data/GetGridData/-1',
            datatype: 'json',
            rowTotal: 2000,
            autowidth: true,
            height:'500px',
            mtype: 'GET',
            loadonce: true,
            sortable:true,
            ...
            viewrecords: true,
            caption: 'Overview',
            jsonReader : { 
                root: "rows", 
                total: "total", 
                repeatitems: false, 
                id: "0"
            },
            loadtext: "Loading data...",
        });
    });