js var event = getEvent(event);
    {
							fieldLabel : "生产厂家",
							id : "yieldPackage",
							labelWidth : 70,
							width : 130,
							xtype : "combo",
							baseCls : "x-plain",
							mode : "local",
							displayField : "factory_name",
							hideTrigger : true,
							triggerAction : "all",
							style : "margin-left:15px;",
							// emptyText:"请选择厂家",
							store : yieldPackageStore,
							listeners : {
								'focus' : function(_c, _r, _i) {
									if (yieldPackageFlag == 0) {
										yieldPackageFlag++;
									}
								},
								'keyup' : function(_c) {
									var event = getEvent(event);
									alert(event.keyCode);
									if (event.keyCode == 38
											|| event.keyCode == 40) {
										return;
									}
									var factory_name = _c.getValue();
									if (factory_name.length >= 2)
										yieldPackageStore.load({
													params : {
														start : 0,
														limit : 10,
														factory_name : factory_name
													}
												});
								}
							}
						}]
					}