Using Googel Weather API for weather Info

**ziaur18@gmail.com** · 2012-03-19, 06:46

Hi,
I am trying to get the weather info using Google weather API in NOKIA S40 web aap series through javaScript but not able to do this.I am getting the error in follwing line

var weatherXML = xmlhttp.responseXML

;

error message are,

Result of expression 'weatherXML' [null] is not an object.

So kindly help me....

**ziaur18@gmail.com** · 2012-03-19, 06:48

Same code is running finw within the IE browser.

**isalento** · 2012-03-19, 07:52

Hi,

You should really as support from Google for this to get definitive answers. I did briefly check this,
and it appears that they are doing server side magic to detect device used to access Google Weather API.

Series 40 device is detected as Mobile, thus get (301 moved permanently response) and are redirected to http://www.google.com/m/ig. Where as IE and other desktop browsers do get XML data as usual.

However the site in http://www.google.com/m/ig no longer offers plain XML, rather they are offering a full mobile optimized site to see the weather.

Br,
Ilkka

**ziaur18@gmail.com** · 2012-03-19, 08:24

Hi Ilkka thanks for your reply,
Here is my complete code

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">

<head>
<title>Weather Forcasting</title>

<script type="text/javascript">
var weather={"onReady":false};

function IpWeather()
{
var xmlhttp=false;

if (window.ActiveXObject)
{
xmlhttp = new ActiveXObject("Microsoft.XMLHTTP");

}
else if (!xmlhttp && typeof XMLHttpRequest != 'undefined')
{
xmlhttp = new XMLHttpRequest();
}

xmlhttp.open("GET","http://www.google.com/ig/api?weather=bangalore",true);
// xmlhttp.setRequestHeader("Content-Type", "text/xml");
xmlhttp.send();

xmlhttp.onreadystatechange = function()
{
if (xmlhttp.readyState == 4)
{
var weatherXML = xmlhttp.responseXML;
var now = weatherXML.getElementsByTagName("current_conditions")[0];
var now_t = now.getElementsByTagName('temp_c')[0].getAttribute('data');
var now_w = now.getElementsByTagName('wind_condition')[0].getAttribute('data');
var now_c = now.getElementsByTagName('condition')[0].getAttribute('data');
var now_h = now.getElementsByTagName('humidity')[0].getAttribute('data');

var today = weatherXML.getElementsByTagName("forecast_conditions")[0];
var t_max = today.getElementsByTagName('high')[0].getAttribute('data');
var t_min = today.getElementsByTagName('low')[0].getAttribute('data');
weather={"t_now":now_t,"wind":now_w,"cloud":now_c,"humidity":now_h,"t_max":t_max,"t_min":t_min,"onReady":true};
}
}
}

IpWeather();

</script>
</head>

<body>
<div id='target'></div>
<script type="text/javascript">
function weatherInfo()
{
if(weather.onReady)
{
document.getElementById('target').innerHTML="Weather:"+weather.cloud+" Temperature now:"+weather.t_now+"? whole day between:"+weather.t_min+"--"+weather.t_max+"? "+weather.humidity+" "+weather.wind;
}
else
{
document.getElementById('target').innerHTML="loading....";
// setTimeout("weatherInfo()",10);
}
}
weatherInfo();
</script>
</body>

</html>

**isalento** · 2012-03-19, 08:50

Hi,

You could implement sanity checks for onreadystatechange function. Something like in code below. However in this case they do not help, as server does not respond in correct format.
There is nothing that can be done in Web App side to make it work.

I understood, that Weather API is not targeted to 3rd party developers, so they can change it's functionality without further notice.

Code:

xmlhttp.onreadystatechange = function(){
   if (xmlhttp.readyState == 4){
     if (xmlhttp.status== 200){
        if(xmlhttp.responseXML){
           //success!
        }else{
          //handle error
        }
     }else{
        //handle error
     }
  }
}

-Ilkka

**ziaur18@gmail.com** · 2012-03-19, 09:06

Hi Ilkka Thanks a lot for your quick reply ,
I am noy able to detect why i am still getting null in xmlhttp.respomseXml.
I changed my code bu still getting null at the xmlhttp.responseXML.

Could you tell me about thsi problem or do you know any alternate way through which i can get the weather info in S40 Web app.

Thanks in Advance.

**isalento** · 2012-03-19, 10:35

I would suggest to change Weather API provider.

Programmable web has a good list to start with:
http://www.programmableweb.com/apis/...apicat=Weather

Br,
Ilkka

**areefnadaf** · 2012-03-19, 12:19

Hi Ilkaa,
And suppose i wish to do this only through google weather API than how can i do this.
Give me your valuable suggestion in brief because i am new to this technology.

Thanks in Advance.

**isalento** · 2012-03-20, 07:08

Hi areefnadaf,

Unfortunately, using Google weather API is not possible at the moment in Series 40 Web Apps.
Google uses User Agent string to detect what browser is used to access whether API.
Desktop browsers do receive correct XML response that has weather data.
Nokia Browser is redirected to mobile site, that does not have weather data.

Br,
Ilkka

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