Parameters to store - extjs

Question

i have a students json data store of a school. The students are enrolled in courses.
And i need, show students by course. So i have the next paginated store:
Ext.define('AM.store.Alumnos', {
extend: 'Ext.data.Store',
model: 'AM.model.Alumno',
autoLoad: false,
start: 0,
pageSize: 20,
remoteSort: true,
proxy: {
type: 'ajax',
url: 'mvc/stores/Alumnos.php',
reader: {
type: 'json',
root: 'data',
successProperty: 'success',
totalProperty: 'total'
}
}
});
And i like, not have a store for each course. Then, when i load the store, send by param the idCourse:
/**
* Muestra la ventana de gestion de un grado.
* #param {int} id course.
* #return {void}
*/
mostrarAbmAlumnos: function(idGradoSolicitado) {
var store = Ext.create('AM.store.Alumnos', {}).load({
params: {idGrado: idGradoSolicitado}
});
}
For the first page, the store works fine, but when i click "next page", the idCourse not trip to server.
Any ideas ?.

Answer 1

I found the solution. When i create the data store, before load it, bind the extraParams at the Proxy.
According the doc:
extraParams : Object Extra parameters that will be included on every
request. Individual requests with params of the same name will
override these params when they are in conflict.
Note: I use ExtJs 4, in previous version, extraParams are called baseParams.
So, the correct code would:
var store = Ext.create('AM.store.Alumnos', {});
store.getProxy().extraParams.idGrado = idGradoSolicitado;
store.load();
And work fine !.