Use local files if CDN is Offline

Asked

Viewed 303 times

9

I wonder if it is possible to perform a callback if a CDN is offline the system uses local files.

Ex: I use the Fontawesome CDN but if the user runs out of the internet or the CDN goes offline, it is possible to create a callback for the system to use local files.

obs. The system should give preference to the use of CDN if it is online and the user has internet.

javascript jquery cdn

  • By "local file" you mean "browser cache"?

  • No, for example, I have the CDN call and also the local file call <link src="fontawesome.min.css"> if the CDN fails the local file is called.

1 answer

5


Yes. I’ll give you an example with jQuery loaded on Google CDN.

In the head of your HTML, you should add the CDN script:

<head>
    <!-- ... -->
    <script src="//code.jquery.com/jquery-1.11.3.min.js"></script>
</head>

In the body, add a code to verify if the $ defined, and if not, add the "fallback" script to be loaded:

<script>
    if ( typeof $ === "undefined" ) {
        var s = document.createElement("script");
        s.type = "text/javascript";
        s.src = "//servidor.com.br/jquery-1.11.3.min.js";
        document.body.appendChild(s);
    }
</script>

Just don’t forget that if you have scripts that require jQuery, they should be loaded dynamically after jQuery is loaded, following the same logic above.

  • 1

    That’s what I needed, I just didn’t know how to do it, I’m a beginner in jQuery and I had seen something like that somewhere, but at the time I didn’t care. thank you very much!

Browser other questions tagged javascript jquery cdn

You are not signed in. Login or sign up in order to post.