Extjs 4.2 store.getRange gives data of previously loaded store - extjs

Question

I have an extjs store associated with grid class. when I select a class, it gives ClassID of the record.
var ClassData = record.get('ClassID');
console.log(ClassData);
Based on this ClassID I am loading store of next grid:
var Grid = this.getSemGrid();
var Store = Grid.getStore(); // your grid's store
//load store with records having selected class ID
var g = Store.load( {params : {ClassID: ClassData }});
Till here everything is fine.
Once the store is loaded, I am getting all loaded records (Error Area)
var selected = g.getRange(); // getRange = select all records
Then pushing all the values of one field of all records in an array
var Excerpt = []; // start with empty array
Ext.each(selected, function(item) {
// add the fields that you want to include
var Obj = {
third_field: item.get('ExamName')
};
Excerpt.push(Obj); // push this to the array
}, this);
console.log(Excerpt);
Excerpt gives array of previously selected record not the current record.
I have also tried
Store.loadData([],false);
to clear all the loaded data of store before loading it again.

Answer 1

Got this working
var g = Store.load({
params : {ClassID: ClassData },
callback : function(records, operation, success){
var Excerpt = []; // start with empty array
Ext.each(records, function(item) {
// add the fields that you want to include
var Obj = {
third_field: item.get('ExamName')
};
Excerpt.push(Obj); // push this to the array
}, this);
}
});