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POJSONP and DOCTYPE Errors
 

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    <p>I'm running into a weird problem.</p> <p>I'm communicating with my server using AJAX. (I'm running my web application on <code>localhost</code>). Server is located on, say, <code>http://www.example.com</code></p> <p>To bypass the Same Origin Policy, I'm using JSONP. I dynamically create a <code>&lt;script&gt;</code> tag and load the data from my server.</p> <p>So far so good.</p> <p>Then I decided to upload my web application to this subdomain: <code>http://m.example.com</code></p> <p>That's when I run into crazy errors. Sometimes the page loads, sometimes it doesn't. When it doesn't load, Firebug throws a <code>DOCTYPE</code> error.</p> <p>I did some research and came across this stackoverflow post: <a href="https://stackoverflow.com/questions/7714896/firebug-returns-syntax-error-in-doctype">firebug returns syntax error in doctype?</a></p> <p><strong>Quoting an answer in this link:</strong></p> <blockquote> <p>This usually happens because you are loading an HTML document as a script. This is often caused by <code>&lt;script src=""&gt;&lt;/script&gt;</code> (i.e. a relative URI pointing at the current, HTML, document)) or one of the scripts pointing to a 404 error.</p> </blockquote> <p>Pretty helpful stuff. Based on all that, I've concluded from all the above that whenever my server responds slowly, the <code>&lt;script&gt;</code> tag's <code>src</code> attribute is null. Since that throws a <code>404 error</code>, I get a <code>DOCTYPE</code> error in Firebug. Whenever my server responds quickly, there are no issues and everything works fine.</p> <p>How do I solve this problem? I could put a manual timeout or something, but that wouldn't exactly be foolproof and an elegant solution.</p> <p>Any help guys?</p> <h1>EDIT:</h1> <p><strong>Here's some code:</strong></p> <p>This function is used to create the <code>script</code> tag dynamically:</p> <pre><code>function appendScriptToHead() { var element = document.createElement("script"); element.src = 'http://www.example.com/?data&amp;callback=callfunction'; document.getElementsByTagName("head")[0].appendChild(element) } </code></pre> <p>This callback function is called when the above url containing JSONP data is loaded: </p> <pre><code>function callfunction(response) { alert(response); } </code></pre>
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    1. COYou'll need to provide some code of some sort.
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    2. COSolve what problem? If you want to solve the `src` being `null`, add a check for `null` before inserting the script tag. If you want to be able to "catch" the error, timeouts are the way to go.
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    3. COHi @RoToRa. I've edited my question and included the code that I'm currently using to retrieve the JSONP data from my server. Thanks!
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