easyui fileBox 获取文件名和添加下拉框

var fileFlag = $('#file').filebox('getValue')
			var index = fileFlag .lastIndexOf("\.");  
			fileFlag  = fileFlag .substring(index + 1, fileFlag .length);

            //easyeasyui 下拉框下拉框
             //通知人员下拉框
            $('#users').combobox({
                url:'${ctx}/notice/getUserList',
                method:'post',
                valueField:'id',
                textField:'name',
                sortName:'name',
                panelHeight:'180',
                multiple:true,
                formatter: function (row) {
                    var opts = $(this).combobox('options');
                    return '' + row[opts.textField]
                },
 
                onShowPanel: function () {
                    var opts = $(this).combobox('options');
                    var target = this;
                    var values = $(target).combobox('getValues');
                    $.map(values, function (value) {
                        var el = opts.finder.getEl(target, value);
                        el.find('input.combobox-checkbox')._propAttr('checked', true);
                    })
                },
                onLoadSuccess: function () {
                    var opts = $(this).combobox('options');
                    var target = this;
                    var values = $(target).combobox('getValues');
                    $.map(values, function (value) {
                        var el = opts.finder.getEl(target, value);
                        el.find('input.combobox-checkbox')._propAttr('checked', true);
                    })
                },
                onSelect: function (row) {
                    //console.log(row);
                    var opts = $(this).combobox('options');
                    var el = opts.finder.getEl(this, row[opts.valueField]);
                    el.find('input.combobox-checkbox')._propAttr('checked', true);
                },
                onUnselect: function (row) {
                    var opts = $(this).combobox('options');
                    var el = opts.finder.getEl(this, row[opts.valueField]);
                    el.find('input.combobox-checkbox')._propAttr('checked', false);
                }
            });