YUI Library Examples: IO: XML Transaction — Retrieving a Yahoo! Weather RSS (XML) Feed via a Server-Side Proxy

//Create a YUI instance including support for IO:
YUI({base:"../../build/", timeout: 10000}).use("io-base", function(Y) {
	// Y is the YUI instance.
	// The rest of the following code is encapsulated in this
	// anonymous function.
} );

//Define a function to handle a successful response from
//Yahoo! Weather.  The success handler will find the response
//object in its second argument:
function successHandler(id, o){
    Y.log("Success handler called; handler will parse the retrieved XML and insert into DOM.", "info", "example");
    var root = o.responseXML.documentElement;
    var oTitle = root.getElementsByTagName('description')[0].firstChild.nodeValue;
    var oDateTime = root.getElementsByTagName('lastBuildDate')[0].firstChild.nodeValue;
    var descriptionNode = root.getElementsByTagName('description')[1].firstChild.nodeValue;
 
    div.set("innerHTML", "<p>" + oTitle + "</p>" + "<p>" + oDateTime + "</p>" + descriptionNode);
 
    Y.log("Success handler is complete.", "info", "example");
}

//When the Get RSS button is clicked, this function will fire
//and compose/dispatch the IO request:
function getModule(){
    //Get the input value:
    var iZip = Y.Node.get('#zip').get("value");
 
    //Create a querystring from the input value:
    var queryString = encodeURI('?p=' + iZip);
 
    //The location of our server-side proxy:
    var entryPoint = '(assets/)weather.php';
 
    //Compile the full URI for the request:
    var sUrl = entryPoint + queryString;
 
    Y.log("Submitting request; zip code: " + iZip, "info", "example");
 
    //Make the reqeust:
    var request = Y.io(sUrl, {
        method:"GET",
        on:
            {
                success:successHandler,
                failure:failureHandler
            }
        }
    );
}
 
//Use the Event Utility to wire the Get RSS button
//to the getModule function:
Y.on("click", getModule, "#getWeather");

YUI({base:"../../build/", timeout: 10000}).use("io",
 
	function(Y) {
 
		//Get a Node reference to the div we'll use for displaying
		//results:
		var div = Y.Node.get('#weatherModule');
 
		//Define a function to handle a successful response from
		//Yahoo! Weather.  The success handler will find the response
		//object in its second argument:
		function successHandler(id, o){
			Y.log("Success handler called; handler will parse the retrieved XML and insert into DOM.", "info", "example");
			var root = o.responseXML.documentElement;
			var oTitle = root.getElementsByTagName('description')[0].firstChild.nodeValue;
			var oDateTime = root.getElementsByTagName('lastBuildDate')[0].firstChild.nodeValue;
			var descriptionNode = root.getElementsByTagName('description')[1].firstChild.nodeValue;
 
			div.set("innerHTML", "<p>" + oTitle + "</p>" + "<p>" + oDateTime + "</p>" + descriptionNode);
 
			Y.log("Success handler is complete.", "info", "example");
		}
 
		//Provide a function that can help debug failed
		//requests:
		function failureHandler(id, o){
			Y.log("Failure handler called; http status: " + o.status, "info", "example");
			div.set("innerHTML", o.status + " " + o.statusText);
		}
 
		//When the Get RSS button is clicked, this function will fire
		//and compose/dispatch the IO request:
		function getModule(){
			//Get the input value:
			var iZip = Y.Node.get('#zip').get("value");
 
			//Create a querystring from the input value:
			var queryString = encodeURI('?p=' + iZip);
 
			//The location of our server-side proxy:
			var entryPoint = '(assets/)weather.php';
 
			//Compile the full URI for the request:
			var sUrl = entryPoint + queryString;
 
			Y.log("Submitting request; zip code: " + iZip, "info", "example");
 
			//Make the reqeust:
			var request = Y.io(sUrl, {
				method:"GET",
				on:
					{
						success:successHandler,
						failure:failureHandler
					}
				}
			);
		}
 
		//Use the Event Utility to wire the Get RSS button
		//to the getModule function:
		Y.on("click", getModule, "#getWeather");
 
		Y.log("When you retrieve weather RSS data, relevant steps in the process will be reported here in the logger/console.", "info", "example");
	}
);

//Within a PHP block:
 
// Since the result is an XML document, the Content-type
// header must be set to "text/xml" for the data to be
// treated as XML and to populate responseXML.
header("Content-Type:text/xml");
 
// io-weather_clean.html is the resource path of the Y! Weather RSS
// with the appended querystring of zip code/location id.
$url = 'http://xml.weather.yahoo.com/forecastrss?'.getenv('QUERY_STRING');
 
// This function initializes CURL, sets the necessary CURL
// options, executes the request and returns the results.
function getResource(io-weather_clean.html){
        $ch = curl_init();
        curl_setopt($ch, CURLOPT_URL, $url);
        curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
        $result = curl_exec($ch);
        curl_close($ch);
 
        return $result;
}
 
// Call getResource to make the request.
$feed = getResource($url);
 
// Return the results.
echo $feed;