CommonJS module to pull XML response from from (undocumented) Google Weather API, for use with Titanium Mobile

00-readme.txt

// console dump of sample returned object


I/TiAPI   (  244): (kroll$4: app://app.js) [797,3312] Object
I/TiAPI   (  244): {
I/TiAPI   (  244): 	weatherData => Object
I/TiAPI   (  244): 	{
I/TiAPI   (  244): 		forecastInfo => Object
I/TiAPI   (  244): 		{
I/TiAPI   (  244): 			city => 'Bydgoszcz, Kuyavian-Pomeranian Voivodeship',
I/TiAPI   (  244): 			forecast_date => '2012-01-01'
I/TiAPI   (  244): 		},
I/TiAPI   (  244): 		currentConditions => Object
I/TiAPI   (  244): 		{
I/TiAPI   (  244): 			condition => 'Rain',
I/TiAPI   (  244): 			temp_f => '32',
I/TiAPI   (  244): 			temp_c => '0',
I/TiAPI   (  244): 			humidity => 'Humidity: 88%',
I/TiAPI   (  244): 			icon => '/ig/images/weather/rain.gif',
I/TiAPI   (  244): 			wind_condition => 'Wind: SE at 4 mph'
I/TiAPI   (  244): 		},
I/TiAPI   (  244): 		forecastConditions => Array
I/TiAPI   (  244): 		[
I/TiAPI   (  244): 			0 => Object
I/TiAPI   (  244): 			{
I/TiAPI   (  244): 				day_of_week => 'Sun',
I/TiAPI   (  244): 				low => '43',
I/TiAPI   (  244): 				high => '45',
I/TiAPI   (  244): 				icon => '/ig/images/weather/chance_of_rain.gif',
I/TiAPI   (  244): 				condition => 'Chance of Rain'
I/TiAPI   (  244): 			},
I/TiAPI   (  244): 			1 => Object
I/TiAPI   (  244): 			{
I/TiAPI   (  244): 				day_of_week => 'Mon',
I/TiAPI   (  244): 				low => '39',
I/TiAPI   (  244): 				high => '48',
I/TiAPI   (  244): 				icon => '/ig/images/weather/fog.gif',
I/TiAPI   (  244): 				condition => 'Fog'
I/TiAPI   (  244): 			},
I/TiAPI   (  244): 			2 => Object
I/TiAPI   (  244): 			{
I/TiAPI   (  244): 				day_of_week => 'Tue',
I/TiAPI   (  244): 				low => '39',
I/TiAPI   (  244): 				high => '41',
I/TiAPI   (  244): 				icon => '/ig/images/weather/mostly_sunny.gif',
I/TiAPI   (  244): 				condition => 'Partly Sunny'
I/TiAPI   (  244): 			},
I/TiAPI   (  244): 			3 => Object
I/TiAPI   (  244): 			{
I/TiAPI   (  244): 				day_of_week => 'Wed',
I/TiAPI   (  244): 				low => '34',
I/TiAPI   (  244): 				high => '45',
I/TiAPI   (  244): 				icon => '/ig/images/weather/mostly_sunny.gif',
I/TiAPI   (  244): 				condition => 'Mostly Sunny'
I/TiAPI   (  244): 			}
I/TiAPI   (  244): 		]
I/TiAPI   (  244): 	},
I/TiAPI   (  244): 	type => 'net:weatherDataReturned',
I/TiAPI   (  244): 	source => [Ti.App]
I/TiAPI   (  244): }

app.js

// Sample app.js
// attempting to follow CommonJS pattern
// googleWeather.js fires a single app-level event that returns
// a single array of javascript objects.

// Normally 1st object will be current conditions, then next 4 objects
// will each be next days' forecasts

// remember 'require' statement does not need .js suffix to filename

require('googleWeather').fetchWeatherData('bydgoszcz,poland')

// set up an event listener to populate data when it's available from the network
Ti.App.addEventListener('net:weatherDataReturned', function(e){
	Ti.API.info(JSON.stringify(e.forecastInfo));
	Ti.API.info(JSON.stringify(e.currentConditions));

        for (var i=0;i<items.length;i++) {
            Ti.API.info(JSON.stringify(e.forecastConditions[i]));
        };
});

googleWeather.js

// maybe add some cache features?  ex: http://pastie.org/1541768
// cache ex: http://pastebin.com/Eq1DLsdP
// modeled after RSSReader demo by @skypanther

// 01-01-2012: refactored arrays and objects; added localization (I think!)


exports.fetchWeatherData = function(location) {
	
        // attempt at localization using Google results, not tested enough!

	var googleCountryArray = ["af","sq","sm","ar","az","eu","be","bn","bh","bs","bg","ca",
	"zh-CN","zh-TW","hr","cs","da","nl","en","en-uk","eo","et","fo","fi","fr","fy","gl",
	"ka","de","el","gu","iw","hi","hu","is","id","ia","ga","it","ja","jw","kn","ko","la",
	"lv","lt","mk","ms","ml","mt","mr","ne","no","nn","oc","fa","pl","pt-BR","pt-PT","pa",
	"ro","ru","gd","sr","si","sk","sl","es","su","sw","sv","tl","ta","te","th","ti","tr",
	"uk","ur","uz","vi","cy","xh","zu"];

	var googleCountryString = googleCountryArray.toString();
	
	var languageCode = 'en';  // default language if device language not found

	// test to see if platform locale is supported by Google API codes	
	
	if (googleCountryString.indexOf(Ti.Locale.currentCountry.toLowerCase())) {
				languageCode = Ti.Locale.currentCountry.toLowerCase();
	};
	
	if (googleCountryString.indexOf(Ti.Locale.currentLanguage.toLowerCase())) {
				languageCode = Ti.Locale.currentLanguage.toLowerCase();
	};	

	Ti.API.info('locale: '+languageCode);	

	// Pulls the weather feed data and returns it to caller
	var xhr = Titanium.Network.createHTTPClient();

	// default weather location feed url
	location = (location) ? location : "bydgoszcz,poland";

	xhr.open('GET','http://www.google.com/ig/api?hl='+languageCode+'&oe=utf8&weather='+location);

	xhr.setRequestHeader('User-Agent', 'mobile agent');
	xhr.send();
	
	xhr.onload = function() {
		// Data is returned from weather API, start parsing
		Ti.API.info('Got data!');
		Ti.API.info('header: '+this.getResponseHeader('Content-Type'));
		var xml = this.responseXML;
		var forecastInfo = xml.documentElement.getElementsByTagName("forecast_information");
		var currentConditions = xml.documentElement.getElementsByTagName("current_conditions");

		var data = {};
				
		// test to see if valid weather data returned			
		if(forecastInfo.length>0) {			
		
			data.forecastInfo = {
				city: forecastInfo.item(0).getElementsByTagName("city").item(0).getAttribute("data"),
				forecast_date: forecastInfo.item(0).getElementsByTagName("forecast_date").item(0).getAttribute("data")
			};
			
			data.currentConditions = {
				condition: currentConditions.item(0).getElementsByTagName("condition").item(0).getAttribute("data"),
				temp_f: currentConditions.item(0).getElementsByTagName("temp_f").item(0).getAttribute("data"),
				temp_c: currentConditions.item(0).getElementsByTagName("temp_c").item(0).getAttribute("data"),
				humidity: currentConditions.item(0).getElementsByTagName("humidity").item(0).getAttribute("data"),
				icon: currentConditions.item(0).getElementsByTagName("icon").item(0).getAttribute("data"),
				//wind_condition: currentConditions.item(0).getElementsByTagName("wind_condition").item(0).getAttribute("data"),
			};
			
			//hmmm... sometimes wind information is not returned...
			if (currentConditions.item(0).getElementsByTagName("wind_condition").length>0) {
				data.currentConditions.wind_condition = currentConditions.item(0).getElementsByTagName("wind_condition").item(0).getAttribute("data");
			} else {
				data.currentConditions.wind_condition = '';
			}
			var forecastConditions = xml.documentElement.getElementsByTagName("forecast_conditions");
			
			data.forecastConditions = [];
			
			for (var i=0;i<forecastConditions.length;i++) {
					data.forecastConditions.push({
						day_of_week: forecastConditions.item(i).getElementsByTagName("day_of_week").item(0).getAttribute("data"),
						low: forecastConditions.item(i).getElementsByTagName("low").item(0).getAttribute("data"),
						high: forecastConditions.item(i).getElementsByTagName("high").item(0).getAttribute("data"),
						icon: forecastConditions.item(i).getElementsByTagName("icon").item(0).getAttribute("data"),
						condition: forecastConditions.item(i).getElementsByTagName("condition").item(0).getAttribute("data"),
				})	
			}
		}
	else {
			Titanium.API.info('oops, error!');
		};
		// fire an app-level event to notify the UI that the weather data is available
		Ti.App.fireEvent('net:weatherDataReturned',{
			weatherData: data
		});
	}; //end onload

	xhr.onerror = function(e) {
		// should do something more robust
		Titanium.API.info(e.error);
	};
}; // end fetchWeatherData()