jqgrid 列显示图片

<script>
    var img;
    //自定义图片的格式，可以根据rowdata自定义
    function alarmFormatter(cellvalue, options, rowdata) {
        return ' <img src="/Content/4.jpg" id="img' + rowdata.Id + '"  style="width:50px;height:50px;" />';
    }
    $(function () {
        $('#imgDialog').hide();

        //var data = { "appId": AppId,"appGroupId": currentNode, "PageNumber": 1, "PageSize": 20 };
        $("#gridTable").jqGrid({
            datatype: "json",
            //postData: data,
            url: "home/List",
            mtype: 'POST',
            colNames: ['姓名', '性别', '帐号', '地点', '会员等级', '图片'],
            colModel: [
                { name: 'UserName', width: 60, sortable: false },
                { name: 'UserSex', width: 60, sortable: false, align: "center" },
                { name: 'LoginAccount', width: 60, sortable: false },
                { name: 'Address', width: 100, sortable: false },
                { name: 'Rank', width: 100, hidden: false, sortable: false },
　　　　　　　　　　//下面这句代码是加入图片的关键，
                { name: 'dsource_alarm', index: 'dsource_alarm', width: 100, align: "center", sortable: false, editable: false, formatter: alarmFormatter }
            ],
            height: '100%',
            gridComplete: function () {
                $('#gridTable img').hover(function (e) {
                    $("body").append("<div id='preview'><img src='" + this.src + "' alt='Image preview'/></div>");
                    $("#preview")
                     .css("top", (e.pageY) + "px")
                     .css("left", (e.pageX) + "px")
                     .fadeIn("fast");
                }
                , function () {
                    $("#preview").remove();
                }).click(function () {
                    $('#imgDialog img').attr('src', this.src);
                    $('#imgDialog').dialog({
                        autoOpen: true,
                        buttons: { "Ok": function () { $(this).dialog("close"); }, "Close": function () { $(this).dialog("close"); } },
                        draggable: true,
                        resizable: false,
                        bgiframe: true
                    });
                    img = this;
                });
            }

        });
    });
</script>