Reload external javascript after asynchronous postback via UpdatePanel

I have an external javascript on my page, e.g. something like:

<script src="http://foo.com/script.js" type="text/javascript"></script>

and an UpdatePanel somewhere. The script writes some content, and does this from within an anonymous javascript function in the js file. I.e., there is something like this in the script:

(function(){document.write('content');})();

Whenever the UpdatePanel is updated through asynchronous postback, everything the script did (or any javascript on my page, for that matter) is made undone. For normal javascript, I would just use:

Sys.WebForms.PageRequestManager.getInst开发者_C百科ance().add_endRequest(myFunction)

to redo all that, but since the function in the script source file is anonymous and called upon definition, I'm SOL! Any ideas?

Note: the external js source is from another domain and its content is out of my control.

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Try this

private string _myScript = @"(function (){
                            var ys = document.createElement('script');
                            ys.type='text/javascript'; ys.async=true;
                            ys.src='http://foo.com/script.js';
                            var s = document.getElementsByTagName('script')[0];
                            s.parentNode.insertBefore(ys,s);
                            });";

Then in your Page_Load

ScriptManager.RegisterStartupScript(this.Page, this.Page.GetType(), "myScript", _myScript , true); 

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Ok, the "solution" ("dirty ugly hack", if you prefer) I came up with:

Instead of loading the js file directly, I load it via a wrapper that reads the file, wraps the result in custom javascript that puts the anonymous function in a global array, and call all functions in said array upon load and after each asynchronous postback.

Please don't enter this solutions in any beauty pageants.

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The real problem here was that I wasn't using UpdatePanels correctly. If the UpdateMode of all the UpdatePanels on your page are set to Conditional, and your ScriptManager has partial updating enabled, it really shouldn't "[undo] everything the script did".