How to submit a form using JsonP in Sencha Touch 2? - forms

Question

I'm writing an application using Sencha Touch 2, it works just fine when accessed from web. The problem came when I built it for iPhone and changed the url from a local url (../services/myservice.php) to a remote url (http://remoteurl.com/services/myservice.php)
I started getting a crossdomain error:
**XMLHttpRequest cannot load http://example.com/services/userRegister.php?_dc=1336972603884. Origin http://localhost is not allowed by Access-Control-Allow-Origin.**
And I'd like to ask you if there is a way to submit a form using jsonp, so I don't have this problem anymore.
Here is my code for the form:
Ext.define('RegistroMovil.view.Register',{
extend: 'Ext.form.Panel',
xtype: 'register',
requires:[
'Ext.form.FieldSet',
'Ext.form.Email'
],
config: {
title: 'Register',
iconCls: 'user',
url: 'http://example.com/proys/congreso/services/userRegister.php',
items: [
...
And the code of the button that submits the form:
{
xtype: 'button',
text: 'Register',
handler: function(){
this.up('register').submit({
success: function(f, a){
alert('Your id: ' + a.id);
f.reset();
}
});
}
},
Thank you very much!

Answer 1

You are getting the above error because of cross-origin resource sharing policy.
On the tap event handler of submit button, you could use an Ext.Ajax.request(); but I feel that would also land up you getting the same error.
E.g
Ext.Ajax.request({
values : paramValues // values from form fields..
url: '.../test.php',
success: function(response) {
console.log(response.responseText);
}
failure: function(response) {
console.log(response.responseText);
}
});
So, it's better to write an Ext.util.JSONP.request() to handle a form submit.
Note that if you are retrieving data from a page that is in a domain
that is NOT the same as the originating domain of the running page,
you must use this class, because of the same origin policy.
E.g
Ext.util.JSONP.request({
params: paramValues // values from form fields..
url: '.../test.php',
callbackKey: 'callback',
scope: 'this',
success: function(response) {
console.log(response.responseText);
}
failure: function(response) {
console.log(response.responseText);
}
});