下拉复选框

$('#beerId').combobox({
   url: '/index.php/Admin/Beer/getBeer',
   valueField: 'id',
   textField: 'text',
   panelHeight: 'auto',
   multiple: true,
   formatter: function (row) {
      var opts = $(this).combobox('options');
      return '<input type="checkbox" class="combobox-checkbox">' + row[opts.textField]
   },
   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);   }});