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Google Scripts Editor

I want to dynamically manage and update a section of a Google Sites page (think HTML).
I understand this needs to be done via a Gadget (to get it on the page), Google Script, and via HTMLService.
The Google Script Editor has a .gs tab and HTML tab for writing the script and HTML. However, I want to separately manage and update the HTML in a document on Google Drive, and have the script use that to feed the HTML back to the page.
Is there a way to reference the document to .createHTMLOutputFromFile(), so that I can have it use the HTML in the doc on Google Drive, rather than having to compose HTML in the Google Script Editor? Please see .gs function example below:
return HtmlService.createHtmlOutputFromFile
(replace **'Index'** with **'Google Docs URL to Google Docs HTML document'**);
I tried different methods for providing the URL, but the script editor can never find the HTML document using the URL I provide. If this is possible, where can I find an example of how to provide the proper URL?

I'd use HtmlService.createHtmlOutput and stream the text in.

var template_welcome = HtmlService.createTemplateFromFile('welcome_template_view');
return template_welcome.evaluate().setTitle("Template Welcome");
that is an example of how to use an html file that is in your google scripts directory. The welcome_template_view is an html file in my directory.

ASP.NET Javascript Not being loaded when ASP Page has URL Mapping

I'm trying to retrieve the ID of an employee and show them in my details page by retrieving the Employee ID from the URL using Page Mapping in ASP.NET:
RouteTable.Routes.MapPageRoute("", "employee/{id}", "~/details.aspx");
Such that the URL will be:
www.myexamplewebsite.com/employee/7937822353
The problem is, the Javascript files don't get loaded and the console is full of my javascript errors. I get a 404 error in my JS scrips as well. The page can't find any JS file when mapped. Why is this happening when I map the URL? This does not happen if the URL is www.myexamplewebsite.com/7937822353.
What am I doing wrong?
EDIT:
This is how my JS files are referenced:
<script src="js/chatbar/rightside.js"> </script>

The script is relative, and it's from the perspective of the client side URL. So when you change the page route to have the page appear to be served from a /employee subdirectory, the correct relative path to your scripts changes. So it's looking for the scripts at /employee/js/charbar/rightside.js. You could change those relative paths (to something like ../js/chartbar/rightside.js), but you might run into a problem later if you change the routing again.
So instead, it's best to make the reference application root relative.
<script src='<%= ResolveClientUrl("~/js/chatbar/rightside.js")%>'></script>

Javascript not found in my ASP.Net Application

I am having a problem in the location of my javascript, the location is right, but when I run it in my visual web developer 2010 express, the location can not be found, I don't know the reason why...
here is the location of my javascript:
<script src="Style/javascript/jquery-1.7.1.js" type="text/javascript"></script>
here is the error:
**Server Error in '/Maitenance' Application.**
**The resource cannot be found.**
**Description: HTTP 404. The resource you are looking for (or one of its dependencies) could have been removed, had its name changed, or is temporarily unavailable. Please review the following URL and make sure that it is spelled correctly.**
**Requested URL: /Maitenance/Maintenance/Style/javascript/jquery-1.7.1.js**

Use this... It will work
<script src="<%=Page.ResolveUrl("~")%>Style/javascript/jquery-1.7.1.js" type="text/javascript"</script>

I guess you are using a master page and your .aspx page is put in another directory. The file path you included in master page is relative to the .aspx file. It works OK when your page in the same directory with the master page.
You can include your js file using ResolveUrl:
<script src="<%=ResolveUrl("~/js/jquery.js")%>" type="text/javascript"></script>
or you can include your script in the code behind of master page:
ClientScript.RegisterClientScriptInclude("jquery", ResolveClientUrl("~/js/jquery.js"));

Print JavaScript code from external file

I am trying to understand how to include JavaScript externally so the code prints to the page.
When I insert the JavaScript directly into the page code, it prints "hello"
<html>
<head>
<title></title>
</head>
<body>
<script type="text/javascript">document.write("hello");</script>
</body>
</html>
However, when I put that same code into external file say "javascript.js" and include it (src) in the html it does not print "hello"?
<html>
<head>
<title></title>
<script type="text/javascript" src="http://thewebsite.com/javascript.js"></script>
</head>
<body>
</body>
</html>
I am trying to understand how to get that external JavaScript file to run and print "hello".
How does XSS work then if a hacker was to include the following tag inside say a textarea to call his malicious script from malicious server?
<script type="text/javascript" src="http://thewebsite.com/javascript.js"></script>
Heres whats in the "javascript.js" file:
<script type="text/javascript">
document.write("hello");
</script>
The file is on the same domain so Same Origin Policy should not apply here and as mentioned if I directly insert code it does work but not when I try to include as separate file.
I thought including JavaScript as external file, should print the contents of the external file (i.e. "hello" in this case) as if it was directly inserted in html page?

When I insert the JavaScript directly into the page code, it prints "hello"
Correct
However, when I put that same code into external file say "javascript.js" and include it (src) in the html it does not print "hello"?
If the content isn't being written then, presumably, an error is being thrown instead. Check the error console for your browser.
The problem is that you are including the HTML script tags in the JavaScript file. JavaScript files should contain only JavaScript.
The file is on the same domain so Same Origin Policy should not apply here
It doesn't. The Same Origin Policy just prevents JavaScript running (not loaded from) Origin A from reading data from Origin B. Since the data is included in the script itself, it would still be available, even if the script was loaded from Origin B.

I guess there is a policy enforced by browsers called Same Origin Policy which makes sure that JS from different domains does not access each others data when loaded in a single page. Lets say that you have a Google Ad and it has some Javascript in it. It wouldn't be advisable if the script in Google Ads be able to access the data in your site (Vice-Versa but ofcourse you always have Google Ads or the Like button as iFrame and hence anyways they are most neatly seperated.)
If you could load the js file as a src to image file then I suppose you can achieve what you intend to.(If I am not wrong.)
Edit: The javascript file cannot be given as input to the src of img tag. You can only use it as javascript: scheme.

get external file source (location) using javascript

I insert an external .js file from another domain. Like this:
<script src="http://externaldomain.com/file.js" type="text/javascript"></script>
file.js is always the same, but it can be placed in different domains,
so I need to know what is the source of the file.
For example: file.js is in domain1.com, domain2.com and domain3.com.
If someone insert it like this: <script src="http://domain1.com/file.js" type="text/javascript"></script>
I want to know that the file is inserted from domain1.com
How to do it?

There's no reliable way of achieving this. Basically inside this file you will need to parse the DOM, search for all the <script> tags and when you find the one that corresponds to the inclusion of this javascript file parse the src attribute to extract the domain.