jqgrid multiselect

demo

by rough cheap

HTML

<link rel="stylesheet" href="//ajax.googleapis.com/ajax/libs/jqueryui/1.11.4/themes/redmond/jquery-ui.css">
<link rel="stylesheet" href="//cdnjs.cloudflare.com/ajax/libs/jqgrid/4.6.0/css/ui.jqgrid.css">
<script src="//ajax.googleapis.com/ajax/libs/jqueryui/1.11.4/jquery-ui.js"></script>
<script src="//cdnjs.cloudflare.com/ajax/libs/jqgrid/4.6.0/js/i18n/grid.locale-en.js"></script>
<script src="//cdnjs.cloudflare.com/ajax/libs/jqgrid/4.6.0/js/jquery.jqGrid.min.js"></script>
<table id="grid"></table>
<div id="pager"></div>

JavaScript

var mydata = [
        { id: "10",  invdate: "2007-10-01", name: "test1",  note: "note1",  amount: "200.00", tax: "10.00", closed: true,  ship_via: "TN", total: "210.00" },
        { id: "20",  invdate: "2007-10-02", name: "test2",  note: "note2",  amount: "300.00", tax: "20.00", closed: false, ship_via: "FE", total: "320.00" },
        { id: "30",  invdate: "2007-09-01", name: "test3",  note: "note3",  amount: "400.00", tax: "30.00", closed: false, ship_via: "FE", total: "430.00" },
        { id: "40",  invdate: "2007-10-04", name: "test4",  note: "note4",  amount: "200.00", tax: "10.00", closed: true,  ship_via: "TN", total: "210.00" },
        { id: "50",  invdate: "2007-10-31", name: "test5",  note: "note5",  amount: "300.00", tax: "20.00", closed: false, ship_via: "FE", total: "320.00" },
        { id: "60",  invdate: "2007-09-06", name: "test6",  note: "note6",  amount: "400.00", tax: "30.00", closed: false, ship_via: "FE", total: "430.00" },
        { id: "70",  invdate: "2007-10-04", name: "test7",  note: "note7",  amount: "200.00", tax: "10.00", closed: true,  ship_via: "TN", total: "210.00" },
        { id: "80",  invdate: "2007-10-03", name: "test8",  note: "note8",  amount: "300.00", tax: "20.00", closed: false, ship_via: "FE", total: "320.00" },
        { id: "90",  invdate: "2007-09-01", name: "test9",  note: "note9",  amount: "400.00", tax: "30.00", closed: false, ship_via: "TN", total: "430.00" },
        { id: "100", invdate: "2007-09-08", name: "test10", note: "note10", amount: "500.00", tax: "30.00", closed: true,  ship_via: "TN", total: "530.00" },
        { id: "110", invdate: "2007-09-08", name: "test11", note: "note11", amount: "500.00", tax: "30.00", closed: false, ship_via: "FE", total: "530.00" },
        { id: "120", invdate: "2007-09-10", name: "test12", note: "note12", amount: "500.00", tax: "30.00", closed: false, ship_via: "FE", total: "530.00" }
    ],
    $grid = $("#grid"),
    initDateEdit = function (elem) {
       ...