TooTallNate/anotherScript.js

## anotherScript.js
// If no exception is passed into 'getScriptName', it will only
// retrieve the URL of the script where 'getScriptName' is defined.
// In order to get the URL of a different script file, you must
// pass an exception generated in this script file to 'getScriptName'.
try {
    (0)();
} catch(ex) {
    getScriptName(ex, onScriptNameKnown);
}

function onScriptNameKnown(name) {
    document.write("<i>"+name+"</i><br>");
    var correctName = "anotherScript.js";
    var isCorrect = name.lastIndexOf(correctName) === name.length - correctName.length;
    document.write("URL ends with 'anotherScript.js': <b>"+isCorrect+"</b><br><br>");
}

## getScriptName.js
// Attempts to retrieve the absolute path of the executing script.
// Pass a function as 'callback' which will be executed once the
// URL is known, with the first argument being the string URL.
function getScriptName(ex, callback) {
    if (typeof ex == 'function') {
        try {
            (0)();
        } catch(e) {
            getScriptName(e, ex);
        }
    } else {

        // Getting the URL of the exception is non-standard, and
        // different in EVERY browser unfortunately.

        if (ex['fileName']) { // Firefox
            //console.log("firefox");
            callback(ex['fileName']);

        } else if (ex['sourceURL']) { // Safari
            //console.log("safari");
            callback(ex['sourceURL']);

        } else if (ex['arguments']) { // V8 (Chrome)
            //console.log("chrome");
            var originalPrepareStackTrace = Error['prepareStackTrace'];
            Error['prepareStackTrace'] = function(error, structuredStackTrace) {
                return structuredStackTrace[1].getFileName();
            }
            // When Error#stack is 'get', Error.prepareStackTrace is
            // called and what's returned is the stack value. See:
            //   http://code.google.com/p/v8/wiki/JavaScriptStackTraceApi
            var stack = ex['stack'];
            Error['prepareStackTrace'] = originalPrepareStackTrace;
            callback(stack);

        } else if (ex['stack']) { // Opera 10
            //console.log("opera");
            var s = ex['stack'];
            s = s.split("\n")[0];
            s = s.substring(s.indexOf("@")+1);
            callback(s.substring(0, s.lastIndexOf(":")));

        } else { // Internet Explorer 8+
            //console.log("internet explorer");
            var origOnError = window['onerror'];
            window['onerror'] = function(msg, url){
                window['onerror'] = origOnError;
                // 'callback' gets invoked in IE 6 & 7, but the
                // 'url' is incorrectly set to location.href.
                // It seems impossible to do correctly this in IE <= 7. See:
                //   http://stackoverflow.com/questions/3019112/getting-url-of-executing-javascript-file-ie6-7-problem-mostly
                callback(url);
                return true;
            }
            throw ex;
        }
    }
}


getScriptName(function(name) {
    document.write("<i>"+name+"</i><br>");
    var correctName = "getScriptName.js";
    var isCorrect = name.lastIndexOf(correctName) === name.length - correctName.length;
    document.write("URL ends with '"+correctName+"': <b>"+isCorrect+"</b><br><br>");
});

## test.html
<!DOCTYPE HTML>
<html>
    <head>
        <script type="text/javascript" src="getScriptName.js"></script>
        <script type="text/javascript" src="anotherScript.js"></script>
        <script type="text/javascript">
            document.write("This happens after everything!"+
                " (i.e. if this is the last line, 'getScriptName' calls 'callback' synchronously)<br>");
        </script>
    </head>
    <body>
    </body>
</html>
	// If no exception is passed into 'getScriptName', it will only
	// retrieve the URL of the script where 'getScriptName' is defined.
	// In order to get the URL of a different script file, you must
	// pass an exception generated in this script file to 'getScriptName'.
	try {
	(0)();
	} catch(ex) {
	getScriptName(ex, onScriptNameKnown);
	}

	function onScriptNameKnown(name) {
	document.write("<i>"+name+"</i><br>");
	var correctName = "anotherScript.js";
	var isCorrect = name.lastIndexOf(correctName) === name.length - correctName.length;
	document.write("URL ends with 'anotherScript.js': <b>"+isCorrect+"</b><br><br>");
	}
	// Attempts to retrieve the absolute path of the executing script.
	// Pass a function as 'callback' which will be executed once the
	// URL is known, with the first argument being the string URL.
	function getScriptName(ex, callback) {
	if (typeof ex == 'function') {
	try {
	(0)();
	} catch(e) {
	getScriptName(e, ex);
	}
	} else {

	// Getting the URL of the exception is non-standard, and
	// different in EVERY browser unfortunately.

	if (ex['fileName']) { // Firefox
	//console.log("firefox");
	callback(ex['fileName']);

	} else if (ex['sourceURL']) { // Safari
	//console.log("safari");
	callback(ex['sourceURL']);

	} else if (ex['arguments']) { // V8 (Chrome)
	//console.log("chrome");
	var originalPrepareStackTrace = Error['prepareStackTrace'];
	Error['prepareStackTrace'] = function(error, structuredStackTrace) {
	return structuredStackTrace[1].getFileName();
	}
	// When Error#stack is 'get', Error.prepareStackTrace is
	// called and what's returned is the stack value. See:
	// http://code.google.com/p/v8/wiki/JavaScriptStackTraceApi
	var stack = ex['stack'];
	Error['prepareStackTrace'] = originalPrepareStackTrace;
	callback(stack);

	} else if (ex['stack']) { // Opera 10
	//console.log("opera");
	var s = ex['stack'];
	s = s.split("\n")[0];
	s = s.substring(s.indexOf("@")+1);
	callback(s.substring(0, s.lastIndexOf(":")));

	} else { // Internet Explorer 8+
	//console.log("internet explorer");
	var origOnError = window['onerror'];
	window['onerror'] = function(msg, url){
	window['onerror'] = origOnError;
	// 'callback' gets invoked in IE 6 & 7, but the
	// 'url' is incorrectly set to location.href.
	// It seems impossible to do correctly this in IE <= 7. See:
	// http://stackoverflow.com/questions/3019112/getting-url-of-executing-javascript-file-ie6-7-problem-mostly
	callback(url);
	return true;
	}
	throw ex;
	}
	}
	}


	getScriptName(function(name) {
	document.write("<i>"+name+"</i><br>");
	var correctName = "getScriptName.js";
	var isCorrect = name.lastIndexOf(correctName) === name.length - correctName.length;
	document.write("URL ends with '"+correctName+"': <b>"+isCorrect+"</b><br><br>");
	});
	<!DOCTYPE HTML>
	<html>
	<head>
	<script type="text/javascript" src="getScriptName.js"></script>
	<script type="text/javascript" src="anotherScript.js"></script>
	<script type="text/javascript">
	document.write("This happens after everything!"+
	" (i.e. if this is the last line, 'getScriptName' calls 'callback' synchronously)<br>");
	</script>
	</head>
	<body>
	</body>
	</html>