Sencha Example

gistfile1.js

Ext.define("app_namespace.model.model_name", {
	extends: 'Ext.data.model',

	config: {
		fields: [
			{ name: 'some_identifier', type: 'string' } 
		]}
})

Ext.define("app_namespace.store.store_name", {
	extends: 'Ext.data.store',

	config: {
		model: 'app_namespace.model.model_name', 

		proxy: {

			type: 'ajax',

			url: '/file/location/script.php',

			reader: {

				type: 'json',

				rootProperty: 'root_name of items',
			}
		}
	}
});

// Then you can load the data with

Ext.getStore('store_name').load({
	callback: 'somefunction';
});