Getting javascript src location/hostname

Question

Is there any recommended solutions when an embedding a script that will make a callback to the originating source but the js resides in a different domain. Sometimes other clients would be in a different domain and I can't rely on getting the document or window location.

Currently, I've been using this but not too happy with this solution.

var host = window.location.hostname;
if(host.indexOf('.devols.') > -1){
  return (('https:' == document.location.protocol) ? 'https://' : 'http://') + host; // return dev or localhost
} else if(host.indexOf('.qaols.') > -1){
  return 'qa environment';        
} else {
  return 'prod environment';
}

Update:

So far I've been playing around with this:

var scriptLocation = '';
var SCRIPT_NAME = 'example.js';
var scripts = document.getElementsByTagName('script');
for(var i=0;i<scripts.length;i++){
  var src = scripts[i].getAttribute('src');
  if(src){
    var index = src.lastIndexOf(SCRIPT_NAME);
    if((index > -1) && (index + SCRIPT_NAME.length == src.length)) {
      scriptLocation=src.slice(0, src.indexOf('/my_script_location/'));
      break;
    }
  }
}
return scriptLocation;

So after the page loads the code cycles thru the script tag array and determines the location so the api can make a callback without having to figure out the urls and etc...

Diodeus - James MacFarlane · Accepted Answer · 2008-12-30 20:28:52Z

1

You'd be better off passing this information from the server and populating it in a JavaScript variable when the page is served.

answered Dec 30, 2008 at 20:28

Diodeus - James MacFarlane

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clawr · Accepted Answer · 2008-12-30 20:34:44Z

0

What you're describing violates the same origin policy, so I don't think it could be accomplished with javascript alone.

answered Dec 30, 2008 at 20:34

clawr

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sammich · Accepted Answer · 2008-12-30 21:09:24Z

0

What about if you specified a callback URL when you ask for the JS? So in your script tag do something like:

<script type="text/javascript" src="http://foo/bar.js?caller=http://blah"></script>

edited Dec 30, 2008 at 21:09

answered Dec 30, 2008 at 20:31

sammich

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1 Comment

ishortman Over a year ago

The reason is because the js file does act like a widget and needs to make a callback to it's originating source.

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