Ext combobox dynamically loads database data of with front and background

Front desk:

 
var provinceStore = new Ext.data.Store({ 
proxy: new Ext.data.HttpProxy({ url: basePath + "/stationManage/station_getProvinceJSON.action" }), 
reader: new Ext.data.JsonReader( 
{ root: "" }, 
["PROVINCEID", "PROVINCENAME"] 
) 
}); 


//Select provinces and cities
var provinceIDadd = new Ext.form.ComboBox({ 
anchor : '98%', 
id:'provinceIDadd', 
name : "provinceIDAdd1", 
hiddenName : "provinceID", 
displayField : "PROVINCENAME", 
valueField : "PROVINCEID", 
blankText : ' Please select the province of the site ', 
emptyText : ' Please select the province of the site ', 
fieldLabel : ' Province of the site ', 
allowBlank : false, 
editable : false, 
triggerAction : 'all', 
store :provinceStore , 
forceSelection : true, 
mode : 'local', 
selectOnFocus : true 
}) 
provinceStore.load(); 

Background action code

 
public class StationAction extends BaseAction { 

private List<Map<String, Object>> provinceList; 
public void setProvinceList(List<Map<String, Object>> provinceList) { 
this.provinceList = provinceList; 
} 

public List<Map<String, Object>> getProvinceList() { 
return provinceList; 
} 
public String getProvinceJSON(){ 
String sql="SELECT PK_ID PROVINCEID,NAME PROVINCENAME FROM T_DICT_DISTRICT A WHERE A.DISTRICT_LEVEL=20"; 
provinceList= stationService.findBySQL(sql); 
return "json_getProvinceList"; 
} 
} 

Strtus XML configuration

 
<result name="json_getProvinceList" type="json" > 
<param name="root">provinceList</param> 
</result> 

Load the drop-down selection box for static data

 
var dataType=[['0','8 column '],['1','38 column '],['2','21 column ']]; 
var dataTypeStore = new Ext.data.SimpleStore({ 
fields: ['dataTypeID', 'dataTypeName'], 
data : data 
}); 

var dataTypedd = new Ext.form.ComboBox({ 
anchor : '98%', 
id:'dataTypeadd', 
name : "dataTypeAdd1", 
hiddenName : "dataType", 
displayField : "dataTypeName", 
valueField : "dataTypeID", 
blankText : ' Please select the data format ', 
emptyText : ' Please select the data format ', 
fieldLabel : ' The data format ', 
allowBlank : false, 
editable : false, 
triggerAction : 'all', 
store :unitStore , 
forceSelection : true, 
mode : 'local', 
selectOnFocus : true 
})