$('#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] }, 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); } });