Lead tracking with jquery.

leadtracking.js

/* This code relies on two small jQuery plugins:
* 
* jQuery Cookie Plugin
* https://github.com/carhartl/jquery-cookie
*
* and
* 
* jQuery replaceText - v1.1 - 11/21/2009
* http://benalman.com/projects/jquery-replacetext-plugin/
* 
* 
* Here's the script: 
*/ 


// getUrlVar function
// Courtesy http://jquery-howto.blogspot.com/2009/09/get-url-parameters-values-with-jquery.html
$.extend({
 getUrlVars: function(){
	 var vars = [], hash;
	 var hashes = window.location.href.slice(window.location.href.indexOf('?') + 1).split('&');
	 for(var i = 0; i < hashes.length; i++)
	 {
		 hash = hashes[i].split('=');
		 vars.push(hash[0]);
		 vars[hash[0]] = hash[1];
	 }
 return vars;
 },
 getUrlVar: function(name){
	 return $.getUrlVars()[name];
 }
});

// jQuery lead-tracking	
var leadSrc		= 'direct'; // Assume it's a direct visit
var referrer	= document.referrer; 

if ( $.getUrlVar('src') ) { // if there's a query variable called 'src'
	leadSrc = $.getUrlVar('src'); // Then the lead source is the query variable.
} else {
	if( referrer ) { // Otherwise, if there's a HTTP referer,
		if ( ( referrer.indexOf( "google.com" ) !== -1 ) || ( referrer.indexOf( "search.yahoo.com" ) !== -1 ) || ( referrer.indexOf( "bing.com" ) !== -1 ) ) { // And that referer is a search engine
			leadSrc = 'search'; // Set leadSrc to 'search'
		} else { // If it's not one of the big three...
			leadSrc = 'web'; // Then the lead source is somewhere on the Web
		}
	}
}

// If it doesn't already exist, store a cookie with the leadSrc as its content, 
// and set leadSrc to the value of the cookie.
if ( !$.cookie( 'cr_leadSrc' ) ) { 
	$.cookie( 'cr_leadSrc', leadSrc, { path: '/', expires:999 } );
}
leadSrc = $.cookie( 'cr_leadSrc' );

// Create a function that swaps content out.
var swapper = function(oldContent, newContent) {
	if (typeof oldContent === 'object') {
		$.each(oldContent, function(i){
			$('body *').replaceText(this, newContent[i]);
		});
	} else {
		$('body *').replaceText( oldContent, newContent );
	}
};

var oldContent = [ // An array, in case there are multiple numbers to change. Can also be a string
	/\(?\b[4][0][4]\)?[-. ]?[2][3][3][-. ]?[2][2][3][0]\b/g // A regular expression, in case the format of the number varies from page to page
];

var newContent = []; // Initialize the new variable

if ( leadSrc === 'adwords' ) { // In this instance, the '?src=' query variable is 'adwords', but it could be anything.
	newContent = [
		'(888) 225-9471'
	];
	swapper(oldContent, newContent);
}

// Swapping out subject lines is just a matter of using the jQuery .val function,
// e.g. $('.yoursubjectlineinput').val('New subject line')
// called at the same time as the 'swapper' function.