Source for "Interchange"

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---

// Interchange for Google Maps and Yahoo Maps
// version 0.2 BETA
// 2005-07-02
// Copyright (c) 2005 Josh Staiger, josh@joshstaiger.org
// Released under the GPL license
// http://www.gnu.org/copyleft/gpl.html
//
// --------------------------------------------------------------------
//
// This is a Greasemonkey user script.
//
// To install, you need Greasemonkey: http://greasemonkey.mozdev.org/
// Then restart Firefox and revisit this script.
// Under Tools, there will be a new menu item to "Install User Script".
// Accept the default configuration and install.
//
// To uninstall, go to Tools/Manage User Scripts,
// select "Interchange", and click Uninstall.
//
// * text lifted from Mark Pilgrim's Butler
// * http://diveintomark.org/projects/butler/
//
// --------------------------------------------------------------------
//
// WHAT IT DOES:
//
// maps.yahoo.com (Yahoo! Maps):
// - adds link to view current location query using Google Maps
// - adds link to view current driving directions query using Google Maps
//
// (In my opinion this script is most useful for using saved Yahoo Maps!
//  addresses with the Google Maps user interface)
//
// --------------------------------------------------------------------
//
// ==UserScript==
// @name          Interchange
// @namespace     http://joshstaiger.org/projects/interchange
// @description	  Adds links to view current Yahoo! Maps locations and driving directions using Google Maps.  
// @include       http://maps.yahoo.com/maps_result*
// @include	  http://maps.yahoo.com/dd_result*
// ==/UserScript==

(function() {

    var GoogleServices = {
	
	// Return the Google Maps URL for displaying the specified location
	getLocationUrl: function(address, cityStateZip, country) {
	    var q = escape(address + " " + cityStateZip);
	    var s = '<a href="http://maps.google.com/maps?q=' + q + '&hl=en">Google Maps</a>';
	    return s;
	},

	// Return the Google Maps URL for displaying the route between
	// the two specified locations
	getRouteUrl: function(addressFrom, 
			      cityStateZipFrom, 
			      countryFrom,
			      addressTo,
			      cityStateZipTo,
			      countryTo) {
	    	    var q = escape('from: ' + addressFrom + ' ' + cityStateZipFrom + ' ' + 'to: ' + addressTo + ' ' + cityStateZipTo);

	    var s = '<a href="http://maps.google.com/maps?q=' + q + '&hl=en">Google Maps</a>';
	    return s;
	}
	
    }
    

    var YahooServices = {

	// Insert text just below the Yahoo Maps navbar 
	// ie: under (Add Maps to My Yahoo! - Edit/Create My Locations)
	addText : function (text) {
	    var navbox = document.getElementById("ymapnad");
	    
	    if (!navbox) {
		return;
	    }

	    var textdiv = document.createElement('div');

	    textdiv.setAttribute('class', 'interchange');
	    textdiv.setAttribute('style', 'background-color:#ff9');

	    textdiv.innerHTML = '<p style="padding:.5em">' + text + '</p>';

	    navbox.parentNode.insertBefore(textdiv, navbox.nextSibling);
	},


	// Insert links to other map services for locations
	addOtherLocationLinks: function () {

	    var s = 'View this location using ';

	    var address = document.mapForm3.addr.value;
	    var cityStateZip = document.mapForm3.csz.value;
	    var Country = document.mapForm3.country.value;
	   
	    s += GoogleServices.getLocationUrl(address, cityStateZip, Country);

	    this.addText(s);

	},

	// Insert links to other map services for driving directions
	addOtherRouteLinks: function() {
	   
	    var s = 'View this route using ';
	    
	    var addressFrom = document.dd.addr.value;
	    var cityStateZipFrom = document.dd.csz.value;
	    var countryFrom = document.dd.country.value;

	    var addressTo = document.dd.taddr.value;
	    var cityStateZipTo = document.dd.tcsz.value;
	    var countryTo = document.dd.tcountry.value;

	    s += GoogleServices.getRouteUrl(addressFrom, 
					    cityStateZipFrom, 
					    countryFrom,
					    addressTo,
					    cityStateZipTo,
					    countryTo);

	    this.addText(s);
 	    
	}

    }

    var href = window._content.location.href;

    // Yahoo Maps location
    if (href.match(/^http:\/\/maps.yahoo.com\/maps_result/i)) {
	YahooServices.addOtherLocationLinks();	
    }

    // Yahoo Maps Driving Directions
    if (href.match(/^http:\/\/maps.yahoo.com\/dd_result/i)) {
	YahooServices.addOtherRouteLinks();	
    }

    //alert('completed Interchange successfully at' + href);

})();

/*
TODO:
- add links from Google Maps back to Yahoo Maps
- integrate with Mapquest
- distinguish interchange links from normal page content
- add help and "about" page
*/

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