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Displaying a css spinner on ajax calls with fetch api

Kelvin Wangonya on February 01, 2019

I always have to search for how to do this or refer back to my previous code whenever I work with fetch. For a while, I've used the solution to thi...
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Ben Sinclair •

This is largely irrelevant to your post :), but you can replace

  spinner.className = "show";
  // ...
  spinner.className = spinner.className.replace("show", "");
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with

  spinner.classList.add('show');
  // ...
  spinner.classList.remove('show');
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which I think makes things a little easier to read and won't interfere with any existing classes.

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Kelvin Wangonya •

Very nice. Didn't know about that 😀

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Andrew Bone •

Getting JavaScript to interact with CSS is a really good way to handle this.

Just for personal preference, I'd probably use the built-in hidden attribute, rather than having a show class. I'd also animate as small an area as possible by moving the spinner to a pseudo-class.

Great work 🙂

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CodeOnJIm •

Oh this is good! spinner is gone as the promise is resolved!

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Adrian B.G. •

You did a common mistake, to not hide the spinner at error, see promise.catch().

I know that error handling is a tabu subject in the JS ecosystem, but we should change this.

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Kelvin Wangonya •

Didn’t know about promise.catch. I’ll check it out. Thanks!

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Laurent C. •

At least use ".finally()" to hide spinner at the end of process. Indeed, ".then()" will never called on error and spinner will stay stuck.

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Obi Pascal Banjuare •

Nice I love to have script on my newly develop blog site.

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Kasim ŞEN •

Thank you very much bro. It's easier than I thought.

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Clara Chaouat •

Thanks a lot ! Very clear explanation

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Shubham Hirakki •

But then, there's a catch. How is it related to the time of loading data. As in, it will always load for 5 seconds irrespective of the actual loading time, isn't it?

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CodeOnJIm •

ya.he just put it there for demonstration.

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bhupendra •

Great .Is there a way to change the loading icon animating speed based upon the content fetched uptill now . Should spin fast if content is about to fully download