extjs Store proxy not writing to updateUsers.json in tutorial - html

Question

So I am following the tutorial here: http://docs.sencha.com/extjs/4.2.1/#!/guide/application_architecture
I am running extjs4.2.1.
app/controller/Users.js
Ext.define('AM.controller.Users', {
extend: 'Ext.app.Controller',
models: ['User'],
stores: ['Users'],
views: ['user.List','user.Edit'],
init: function() {
this.control({
'viewport > userlist': {
itemdblclick: this.editUser
},
'useredit button[action=save]': {
click: this.updateUser
}
});
},
editUser: function(grid, record) {
var view = Ext.widget('useredit');
view.down('form').loadRecord(record);
},
updateUser: function(button) {
var win = button.up('window'),
form = win.down('form'),
record = form.getRecord(),
values = form.getValues();
record.set(values);
win.close();
// synchronize the store after editing the record
this.getUsersStore().sync();
}
});
app/store/Users.js
Ext.define('AM.store.Users', {
extend: 'Ext.data.Store',
model: 'AM.model.User',
autoLoad: true,
proxy: {
type: 'ajax',
reader: {
type:'json',
root:'users'
},
writer: {
type:'json',
},
api:{
read: 'data/users.json',
update: 'data/updateUsers.json'
}
}
});
However, updateUsers.json NEVER gets updated on a save (.sync()).
I have check the API documentation and searched google extensively. I have found people with the same issues but no answers.

Answer 1

A json files is just a text file, so no, it doesn't get updated, because there's nothing to process it. Imagine if a page could make a request to the server and change the contents. It would be a giant security hole.
You need PHP/C#/Java/whatever to actually do something with it.
I'm curious as to why you expected that it would update, are you new to web programming?