JavaScript - How do I get the URL of script being called?

Question

So, let's say I have this in the file http://site1.com/index.html:

<script src=http://site2.com/myscript.js&gt;&lt;/script&gt;

Inside "myscript.js", I need to get access to the URL "http://site2.com/myscript.js". I'd like to have something like this:

function getScriptURL() {
    // something here
    return s
}

alert(getScriptURL());

Which would alert "http://site2.com/myscript.js" if called from the index.html mentioned above.

I need this because the same script is going to be all over the place, and I don't want to have to hard-code its location into each one.

Thanks!

Answer 1

Can't you use location.href or location.host and then append the script name?

Answer 2

From http://feather.elektrum.org/book/src.html:

var scripts = document.getElementsByTagName('script');
var index = scripts.length - 1;
var myScript = scripts[index];

The variable myScript now has the script dom element. You can get the src url by using myScript.src.

Note that this needs to execute as part of the initial evaluation of the script. If you want to not pollute the Javascript namespace you can do something like:

var getScriptURL = (function() {
    var scripts = document.getElementsByTagName('script');
    var index = scripts.length - 1;
    var myScript = scripts[index];
    return function() { return myScript.src; };
})();