easyui combobox 带 checkbox

$('#cc').combobox({
url:'combobox_data1.json',
method:'get',
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);
}
});