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Default path in HTML for JS file if not found from original source

I am wondering, is it possible to provide an alternative path for a file if it cannot be found from the original one? For example I provide an src which points to an external source, this should be the default src, but if it cannot be reached for some reason, then it should load the file from the source folder.

Example:

Original:

<script src="https://unpkg.com/swagger-ui-dist/swagger-ui-bundle.js"></script>

And if this cannot be loaded, then:

<script src="js/swagger-ui-bundle.js"></script>

So I could load the newest from the js file, or the default I have.

Thanks!

Solution

  • Try just putting them in order in your script like so:

    <script src="js/swagger-ui-bundle.js"></script>
<script src="https://unpkg.com/swagger-ui-dist/swagger-ui-bundle.js"></script>

    so that it loads one and then tries to load the other. This should work unless you have conflicting scripts.