Javascript detect static <script> load failues [duplicate]

Question

This is similar to How to tell if a <script> tag failed to load. But my question is specifically about plain old <script> tags in my HTML body like so

<script type="text/javascript" src="/path/to/my/script.js"></script>

I have a custom window.onerror function that I wrote to deal with general script errors. And indeed, if such a script has a syntax error or some other runtime error occurs while evaluating the script itself, that is handled correctly by my onerror function.

But if the script fails to load at all, because of an interrupted connection or even a 404 or other server error, window.onerror is not called. How can I detect this kind of failure programmatically in Javascript?

To clarify: I realize I could just put an onerror attribute in every single script tag. I'm asking if there's a better way, something comparable to my global window.onerror or some way of making that function be called.

Answer 1

You can check youruniquefunction in your script tag

 if (typeof youruniquefunction!== 'undefined' ) {
   // your script ok
}