JavaScript: Prevent _gat._getTracker from causing errors

I can I prevent these two lines from causing errors?

var pageTracker = _gat._getTracker("ZW-12345678-9");
pageTracker._trackPageview();

<!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" xml:lang="en-gb" lang="en-gb" >
<head>
<title>Hello</title>
</head>
<body>
<h1>Hello World</h1>

<script type="text/javascript">

//// Rows below may be modified
var _gat = {}; 
_gat._getTracker = function() {return 1;}
/// Rows above may be modified

/// I cannot modify code after this point ///
var pageTracker = _gat._getTracker("ZW-12345678-9");
pageTracker._trackPageview();
</script>

</body>
</html>

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LVL 16
hankknightAsked:
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leakim971Connect With a Mentor PluritechnicianCommented:
So line 12 to 13, don't worry about which one you're returning, always returnt the value for "ZW-12345678-9" :


this["_getTracker"] = function(s) {
			return this["ZW-12345678-9"];
		}

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leakim971PluritechnicianCommented:
For example :


<!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" xml:lang="en-gb" lang="en-gb" >
<head>
<title>Hello</title>
</head>
<body>
<h1>Hello World</h1>

<script type="text/javascript">

//// Rows below may be modified
	var _gat = new function() {
		this["_getTracker"] = function(s) {
			return this[s];
		}
		this["ZW-12345678-9"] = {}
		this["ZW-12345678-9"]["_trackPageview"] = function() { 
			alert("tracked");
		}
	}

/// Rows above may be modified

/// I cannot modify code after this point ///
var pageTracker = _gat._getTracker("ZW-12345678-9");
pageTracker._trackPageview();
</script>
</body>
</html>

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0
 
hankknightAuthor Commented:
Thanks, only one problem: the value of this is not always ZW-12345678-9
_gat._getTracker("ZW-12345678-9");

It is different on every page and I have no control over its value.  
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leakim971PluritechnicianCommented:
So line 12 to 13, don't worry about which one you're returning, always returnt the object for "ZW-12345678-9"
0
 
JerseyFooCommented:
Why are you messing with Google Analytics anyway?  If you're having errors with their code, check to see if they have a new version of their snippet available.
0
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