how to make a login with a cross-domain request?

[alexunocuatro]

Hi, I am trying to make a login for my app, and i do not understand the poor documentation, i need help...
can somebody help me?, give me and example or something please!!... thanks..
this is my code...
View

Ext.define('Scanner.view.Main', {    extend: 'Ext.Container',


    requires: [
        'Ext.TitleBar'
    ],


    config: {
        ui: 'dark',
        layout: {
            type: 'vbox'
        },
        scrollable: false,
        items: [
            {
                xtype: 'titlebar',
                docked: 'top',
                scrollable: false,
                title: 'Scanner'
            },
            {
                xtype: 'fieldset',
                id: 'login',
                ui: 'dark',
                scrollable: false,
                instructions: 'Ingresa los datos',
                title: '<center>Login</center>',
                layout: {
                    align: 'center',
                    pack: 'center',
                    type: 'vbox'
                },
                items: [
                    {
                        xtype: 'textfield',
                        id: 'usuario',
                        label: 'Còdigo Mensajero:',
                        maxLength: 15,
                        placeHolder: 'A2S3D4'
                    },
                    {
                        xtype: 'passwordfield',
                        flex: 1,
                        id: 'password',
                        label: 'Clave Mensajero:',
                        name: '',
                        maxLength: 15,
                        placeHolder: '******'
                    },
                    {
                        xtype: 'button',
                        id: 'sentButton',
                        ui: 'confirm-round',
                        text: 'Acceso'
                    }
                ]
            }
        ]
    }


});

Controller

Ext.define('Scanner.controller.Controller', {    extend: 'Ext.app.Controller',


    requires: [
        'Ext.MessageBox'
    ],


    config: {
        refs: {
            sentButton: '#sentButton',
            usuario: '#usuario',
            password: '#password'
        },


        control: {
            "sentButton": {
                tap: 'sendParametters'
            }
        }
    },


    sendParametters: function(button, e, options) {
        if(this.getUsuario().getValue() === "" || this.getPassword().getValue() === ""){
            Ext.Msg.alert('Informaciòn Usuario', 'Falta Informaciòn Requerida', Ext.emptyFn);
        }
//I do not what to do here... here is where i guess that i should to send the parameters but i do not how
//can somebody help me?




    }


});

Store

Ext.define('Scanner.store.MyJsonPStore', {    extend: 'Ext.data.Store',


    requires: [
        'Scanner.model.MyModel'
    ],


    config: {
        model: 'Scanner.model.MyModel',
        storeId: 'MyJsonPStore',
        proxy: {
            type: 'jsonp',
            url: 'http://sicom.linux-si.com/cgi-bin/webapps/sicom/scanner.py',
            reader: {
                type: 'json'
            },
            writer: {
                type: 'json'
            }
        }
    }
});

Model

Ext.define('Scanner.model.MyModel', {    extend: 'Ext.data.Model',


    config: {
        fields: [
            {
                name: 'messenger_code',
                type: 'string'
            },
            {
                name: 'password',
                type: 'string'
            },
            {
                name: 'action',
                defaultValue: 'LOGIN',
                type: 'string'
            }
        ]
    }
});

[mitchellsimoens]

Why are the docs poor because of this question? I don't get that comment from you.

Does your server support CORS or JsonP?