Extjs让combobox写起来简洁又漂亮

Ext.define('Admin.view.baseCmp.BaseCombobox', {
 extend: 'Ext.form.field.ComboBox',
 xtype: 'baseCombobox',
 editable: false,
 labelSeparator: ':',
 labelWdith: 0,
 triggerAction: 'all',
 labelAlign: 'right',
 //forceSelection: true,此属性操作时，就算去掉文字后，失去焦点后还是会选择上一次选择的记录
 autoSelect: true,
 selectOnfocus: true,
 valueNotFoundText: '',
 name:'',
 queryMode: 'local',
 url:'',
 displayField: '',
 valueField: '',
 requires:['Admin.view.baseCmp.BaseComboboxController'],
 controller: 'baseComboboxController',
 emptyIndex:-1,//自定义属性,空值所在下标，-1则不添加
 selectIndex:0,//自定义属性，自动选择下标
 params:null,//自定义属性，数据参数
 listeners: {
  render: 'getComboData',
  scope: 'controller'
 },
});

Ext.define('Admin.view.baseCmp.BaseComboboxController', {
 extend: 'Ext.app.ViewController',
 alias: 'controller.baseComboboxController',
 getComboData: function (bo) {
  Ext.Ajax.request({
   url: bo.url,
   method :'POST',
   params:bo.params,
   suess: function (response) {
    var dataJson = Ext.decode(response.responseText);
    if(dataJson.state != 200 || dataJson.data == null || dataJson.data.length == 0)
    {
     //服务器返回错误
     return ;
    }
    var data = dataJson.data;
    //插入“全部”选项
    if(bo.emptyIndex >= 0)
    {
     var emp = {};
     emp[bo.displayField] = "全部";
     emp[bo.valueField] = "全部";
     Ext.Array.insert(data,bo.emptyIndex,[emp]);
    }
    var store = Ext.create('Ext.data.Store', {
     fields: Ext.Object.getKeys(data[0]),
     data: data
    });

    bo.setStore(store);
    //如果指定选中某个值
    if(bo.selectValue != null)
    {
     bo.select(bo.selectValue);
    }
    else
    {
     //如果指定选中某个下标的值，-1为一个，> 0 则为第selectIndex个
     if(bo.selectIndex == -1)
     {
      console.log(data.length - 1);
      bo.select(data[data.length - 1][bo.valueField]);
     }
     else
     {
      bo.select(data[bo.selectIndex][bo.valueField]);
     }

    }

    //触发选中事件
    //bo.fireEvent('select', bo,store.getAt(bo.selectIndex));
   },
   failure: function (response) {
    //请求服务器失败
   }
  });

 }
});

{
    xtype: 'baseCombobox',
    name: "typeName",
    fieldLabel: "类型",
    displayField: 'typeName',
    valueField: 'id',
    emptyIndex:0,
    multiSelect:false,
    url:"/itemType/list",
    listeners:{
     select:'query'
    }
},