chapter_15_example_3.js

        var ourStore = new Ext.data.JsonStore({ //change to JsonStore
          url:'Chapter15Example.json',
          root:'files', //add root here
          fields: [ //add fields here
            {name:'file_name',mapping:'name'},
            {name:'file_size',mapping:'size',type:'int'},
            'type',
            {name:'lastmod',mapping:'datelastmodified',type:'date'},
            {name:'file_attributes',mapping:'attributes'}, //these last few fields are not in the source json
            'mode',
            'directory'
          ],
          baseParams:{ //note to reader that this defaults to a POST
            method: 'getFileInfoByPath',
            returnFormat: 'JSON',
            queryFormat: 'column',
            startPath: '/images/'
          },
          listeners:{
            load: function(store,records,options){
              console.log(records);
            },
            exception: function(proxy,type,action,options,response,arg) {
              console.log(arguments); //added to watch what was going wrong
            }
          }
        });

        ourStore.load({
          params:{startPath:'/foo'} // you don't need to assign baseParams in 'beforeload' - the load() method does it for you
        });