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POCircumventing Chrome Access-control-allow-origin on the local file system?
 

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    <p>I've read the other same origin policy topics here on SO, but I haven't seen any solutions related to the local file system.</p> <p>I have a web app (In a loose sense of the word) that must be local served. I am trying to load a large amount of data in after the user has loaded the page, depending on what they are doing on the webpage. In Firefox 3.5 and IE8 I am able to use jQuery's AJAX() and GetScript() methods to do this, but in Chrome this fails due to the Same Origin Policy. </p> <blockquote> <p><code>XMLHttpRequest</code> cannot load <code>file://test/testdir/test.js</code>. Origin <code>null</code> is not allowed <code>by Access-Control-Allow-Origin</code>.</p> </blockquote> <p>This happens when I do something simple like</p> <pre><code>$.getScript("test.js"); </code></pre> <p>This functions perfectly well in IE &amp; Firefox.</p> <p>After reading a bunch about this, I decided to try writing directly into the head of the document. In the console in Chrome I typed the following:</p> <pre><code>var head = document.getElementsByTagName("head")[0]; var script =document.createElement('script'); script.id = 'uploadScript'; script.type = 'text/javascript'; script.src = "upload.js"; head.appendChild(script); </code></pre> <p>This works fine when pasted in the console- the <code>&lt;script...test.js&lt;/script&gt;</code> element is added to the head, evaluated, and content loaded into the DOM.</p> <p>I thought this was successful, until I put this code into a function call. The same exact code, when called from a function, adds the element to the but does not evaluate the JavaScript file. I can not figure out why. If I use Chrome's console to stop execution in the method that it is adding the element to the and run the above code, it does not evaluate it. However, if I unpause the execution and run the exact same code (pasting it in the console window) it works. I'm at a loss to explain this. Has anyone dealt with this before?</p> <p>I've read up on the following SO posts, but they are not describing the problem that I have: </p> <p><a href="https://stackoverflow.com/questions/3076414/ways-to-circumvent-the-same-origin-policy">Ways to circumvent the same-origin policy</a><br> <a href="https://stackoverflow.com/questions/4208530/xmlhttprequest-origin-null-is-not-allowed-access-control-access-allow-for-file">XMLHttpRequest Origin null is not allowed Access-Control-Allow-Origin for file:/// to file:/// (Serverless)</a><br> <a href="https://stackoverflow.com/questions/395045/cross-site-xmlhttprequest">Cross-site XMLHttpRequest</a></p> <p>Again, my last resort is to load all the data at the webpage's load- This can cause up to a 10 second delay in loading the webpage that is unnecessary for 90% of the app's users.</p> <p>Thanks for any suggestions/alternatives!!!</p>
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