YUI Library Examples: Connection Manager: Retrieving a Yahoo! Weather RSS Feed

Connection Manager: Retrieving a Yahoo! Weather RSS Feed

This example demonstrates how to use the Connection Manager and a PHP proxy — to work around XMLHttpRequest's same-domain policy — to retrieve an XML document from http://xml.weather.yahoo.com/forecastrss.

To try out the example, fill in your five-digit US zip code, your desired units (C or F), and click "Get Weather RSS".

Please enter a U.S. Zip Code or a location ID to get the current temperature. The default is Zip Code 94089 for Sunnyvale, California; its location ID is: USCA1116.

Enter *F* for Fahrenheit or *C* for Celsius temperature unit.

Exploring the Code for This Example

Load the Yahoo Global Object and Connection Manager source files:

Callback Object and the Weather RSS

Yahoo! Weather RSS will return an XML document if the transaction is successful. The following callback object with success and failure handlers is used to process the response.

Assemble the Querystring and Initiate the Transaction

The Yahoo! Weather RSS feed requires a simple HTTP GET request with a base URL and a querystring containing the required information as name-value pairs. In this example, we will use the following parameters:

  • p — location as U.S. Zip Code or Location ID
  • u — temperature units

The following are some example location IDs (do not include the city name):

  • Beijing: CHXX0008
  • Helsinki: FIXX0002
  • London: UKXX0085
  • Moscow: RSXX0063
  • Munich: GMXX0087
  • Paris: FRXX0076
  • Riyadh: SAXX0017
  • Tokyo: JAXX0085

For more details on the Yahoo! Weather RSS feed and other location IDs, please visit http://developer.yahoo.com/weather/index.html.

Function getModule retrieves the input values for location and temperature and creates a querystring:

Proxy and Response

Once weather.php receives the querystring, it will construct and send an HTTP GET using CURL to retrieve the results from the Yahoo! Weather RSS feed. This allows the transaction to succeed while working around XMLHttpRequest's strict security policy.

Copyright © 2007 Yahoo! Inc. All rights reserved.

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