var a;

       var dwField = new Ext.form.ComboBox({

            fieldLabel:'管理员',            

            mode: 'local',                           

            width:70,                                

            id:'user_name',                        

            name:'user_name',

            editable:false,

            allowBlank:true,

            typeAhead:true,

            triggerAction: 'all',

            selectOnFocus:true,

            store:Ext.basicdata.user,

            emptyText:'-请选择-',  

            hiddenName:'u_id',                                               //用户ID

            valueField: 'user_id',   

            displayField: 'user_name',    

     

            listeners:{        

                   select : function(combo, record,index)   

                   {    

                       jhField.clearValue(); //可以实现当队下拉值变更时，清空之前井号下拉选项中的值   

                       SegField.clearValue();

                       storejh.proxy= new Ext.data.HttpProxy({url: './DataPageHand.aspx?method=GetAirLine&user_id='+combo.value}); //根据队下拉选项的改变，动态取出对应的井

                       a=combo.value

                       storejh.load(); //加载航段下拉框的store

                       

                   }      

               }   

    });  

 

================================================================

 

alert(Ext.getCmp('user_name').getValue());

alert(Ext.getCmp('user_name').getRawValue());