Simple login example

login.js

var login = {
	authorized: false,
	session_id: null,
	init: function() {
		// See if we have an existing sess_id
		login.session_id = login.checkForSession();
		
		// If not, open login window
		if(!login.session_id) {
			login.openLoginPage();
		}
	},
	checkForSession: function() {
		// See if we have the property available
		if(Ti.App.Properties.hasProperty("session_id")) {
			return Ti.App.Properties.getString("session_id");
		} else {
			return false;
		}
	},
	openLoginPage: function() {
		// Create a window with text fields for username / password
		// Create a submit button for login
		submitButton.addEventListener("click", function(_event) {
			// Check the supplied credentials
			login.authorize();
		}
	},
	authorize: function() {
		// Call out to a login API
		var httpc = Ti.Network.createHTTPClient();

		httpc.onload = function(e) {
			login.authorizeCallback(this.responseText);
		};

		httpc.onerror = function(_event) {
			// Show error message
		};

		httpc.open("GET", "http://---/req.php");
	},
	authorizeCallback: function(_data) {
		// Grab the JSON response (see below) from server
		// { e: "ok", id: 123 }
		
		if(_data && _data.e == "ok") {
			login.complete(_data.id);
		} else {
			login.error();
		}
	},
	complete: function(_id) {
		// User is authorized
		
		login.authorized = true;
		login.session_id = _id;
		Ti.App.Properties.setString("session_id", _id);
		
		// Close login screen
	},
	error: function() {
		// Incorrect user / password
		// Show error message, allow retry
	}
};