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Editorial Team
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Asked: 2026-06-06T20:42:34+00:00

I’m working with some code provided via this post , courtesy of @Phrogz. I’ve

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I’m working with some code provided via this post, courtesy of @Phrogz.
I’ve now tweaked and trimmed it to a launch-point for my needs, so I’m trying to plug that JS into my test page.
I threw a copy of my test page here on Pastebin.

I’m getting this error (courtesy of line 126):
Uncaught TypeError: Cannot call method ‘addEventListener’ of null

My attempts to this point have all revolved around the guess that the updateFromInput function is at the heart of the error. I played with it all the ways that I could think of, and no dice 🙂
Granted, though, I’m faaar from being a JS master, so …

Can someone explain why the error?

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1 Answer

  1. Editorial Team

    Apparently, input_1 is null.

    The problem could be with querySelector. You could instead try getElementsByClassName.

    Oh, your class on your element is “input1” but you’re selecting “input_1”. Easy mistake 🙂

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