I am getting json response and am trying to put json in store but it is not loading it properly.


HTML Code:
Ext.Ajax.request({   
                       url: url,                                               
      success: function(xhr) {                       
   response = Ext.JSON.decode(xhr.responseText.trim());                          //alert(xhr.responseText.trim());                                                  
  for(i=0;i< response.data.length; i++)                                                     {                              instancestore[i] = Ext.create('Ext.data.Store', {           
                       autoLoad: true,                     
             model: 'RA.model.DataModel',    
                             proxy: {               
                       type: 'memory',           
                           data: response,      
                                reader: {          
                                type: 'json',      
                                    root: 'data'      
                                }               
                   }         
                     });           
                                            }   
My Json output is :

HTML Code:
{    "data": 
[{        "0": [{            "DowntimeEvents": 179,            "DowntimeHours": 78355        }]    },    {        "1": [{            "DowntimeEvents": 176,            "DowntimeHours": 97835        }]    },    {        "2": [{            "DowntimeEvents": 140,            "DowntimeHours": 100501        }]    }]}
I tried below code but it is passing null value of DowntimeEvents and DowntimeHours in the store.
HTML Code:
 Ext.Ajax.request({    
                                    url: url,     
                                                success: function(xhr) {   
                       response = Ext.JSON.decode(xhr.responseText.trim());  
                        //alert(xhr.responseText.trim());               
                                     for(i=0;i< response.data.length; i++)                                                     {                            alert(response.data[0].DowntimeEvents);                        
               
          instancestore[i] = Ext.create('Ext.data.Store', {            
                      autoLoad: true,               
                   model: 'RA.model.DataModel',        
                          data: response.data[i],                 
                 proxy: {            
                          type: 'memory',           
                                                                reader: {     
                                     type: 'json',       
                                                                     
    }                               
   }                      
        });                               
                        }