jquery实现可编辑的下拉框( input + select )

HTML：

  <input id="inputModel" />
  <select name="EngineModel" size="10" style="height: auto; margin-left: 120px; position: absolute; display: none;"></select>

Jquery：

 //获取select
  var engine = $('select[name="EngineModel"]');
//页面加载，初始赋值select选项
 $.get('engines.aspx', function (engineModels) {
            engines = eval(engineModels);
            for (var i = 0; i < engines.length; i++) {
                engine.append('<option>' + engines[i].Model + '</option>');
            }
        })
//for (var i in engines) {
//            engine.append('<option>' + engines[i] + '</option>');
//        }

//绑定值至select（可用于修改）
 if ('<%=order.EngineModel%>') {
            engine.val('<%=order.EngineModel%>');
        }

//select的change事件，选中的值赋给input
$('input[name="EngineModel"]').change(function() {
document.getElementById('inputModel').value = document.getElementById('SelectModel').options[document.getElementById('SelectModel').selectedIndex].value;
        })

//可编辑select具体实现
 var focus = false;
        $("#inputModel").focus(function () {
            focus = true;
            $(this).next().css('display', 'block');
        }).blur(function () {
            if (focus) {
                $(this).next().css('display', 'none');
            }
        }).keyup(function () {
            var queryCondition = $("#inputModel").val().toLowerCase();
            if (queryCondition.length != 0) {
                engine.empty();
                for (var i in engines) {
                    if (engines[i].toLowerCase().indexOf(queryCondition) != -1) {
                        engine.append('<option>' + engines[i] + '</option>');
                    }
                }
            } else {
                for (var i in engines) {
                    engine.append('<option>' + engines[i] + '</option>');
                }
            }
        }).next().mousedown(function () {
            focus = false;
        }).change(function () {
            $(this).css('display', 'none').prev().val(this.value);
        });