Suppose a website http://www.mysite.com contains an external JavaScript file added like this:
<script src="http://www.yoursite.com/new.js"></script>
Within the http://www.yoursite.com/new.js JavaScript file, there is an AJAX call to a script in http://www.yoursite.com/new.js
In this scenario, does the same-origin policy security issue arise since it's calling a script from a different website?
There seems to be an issue with the way new.js is being executed within the context of mysite.com, rather than yoursite.com.
UPDATE: To provide a more thorough explanation, when mysite.com includes a script tag, that script runs within the scope of the current page. It doesn't matter if the script is inline, local, or remote - it is all considered part of mysite.
Due to the same origin policy, scripts on mysite.com are restricted from accessing anything on yoursite.com. This restriction prevents the desired action from being carried out.
For an advanced solution to facilitate cross-origin communication, consider implementing jsonp. This method will require special handling on yoursite.com, but if you have control over both sites, it should be a viable option.
Have you heard of JSONP? It might be just what you're searching for: http://en.wikipedia.org/wiki/JSON
In a nutshell, JSONP works by making a request for external scripts using a similar mechanism to what you're already familiar with. The key difference is that your server will recognize this request and will wrap the JSON response as an argument to a callback function. When your website receives this 'script', it will run it and return the data directly into your callback function.
If you're using a framework like jQuery, a lot of the client-side work will be taken care of for you. You can find more information here: http://api.jquery.com/jQuery.getJSON/
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