easyui combobox下拉效果 可输入 模糊查询

<link rel="stylesheet" type="text/css" href="${rc.contextPath}/css/themes/default/easyui.css">
<script type="text/javascript" src="${rc.contextPath}/js/jquery/jquery.easyui.min.js"></script>

判断输入值在下拉列表是否存在
var nameStr ='';
    $(document).ready(function(){

        $('#customerId').combobox({ 
            prompt:'请输入或选择客户名称',
            url:'${rc.contextPath}/sale/findBusinessPartnerByName', 
            valueField:'id', 
            textField:'text' ,
            onClick: function(node) {
                attributeShow($("#customerId").combotree("getValue"));
            },
            filter: function(q, row){
                var opts = $(this).combobox('options');
                //return row[opts.textField].indexOf(q) == 0;
                return row[opts.textField].indexOf(q)>-1;//将从头位置匹配改为任意匹配
            },
            onLoadSuccess: function(){
                var partnerId = '${(saleOrder.partnerId)!}';
                if(partnerId){
                    $('#customerId').combobox('setValue',partnerId);
                }
            },
            onSelect: function(){
                var partnerId = $("#customerId").combotree("getValue");
                $("#business_partner_id").val(partnerId);
                findBusinessPartnerContactByPartnerId(partnerId);
                findSaleAddressByPartnerId(partnerId);
            },
            onChange: function(newValue, oldValue){
                var v = $("#customerId").combotree("getText");
                var arr = nameStr.split(',');
                var index = $.inArray(v, arr);
                if(index < 0 ){   
                    $("#business_partner_id").val('');
                }else{
$("#business_partner_id").val($("#customerId").combobox("getValue"));
}
            },
            formatter: function(row){
                var opts = $(this).combobox('options');
                nameStr += row[opts.textField] + "," ;
                return row[opts.textField];
            }
        });

    });