Edit fiddle - JSFiddle - React, Tailwind, and code Playground

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HTML

<input type="text" class="myClass" value="">
<input type="text" class="myClass" value="0">
<input type="text" class="myClass" value="123">
<input type="text" class="myClass" value="">
<input type="text" class="myClass" value="abc">

CSS

.error {
  outline: solid 1px red;
}

JavaScript

[].forEach.call(document.querySelectorAll('.myClass'), el => {
  if (!el.value) {
    el.classList.add('error')
  }
})

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JSFiddle - React, Tailwind, and code Playground

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CSS

JavaScript

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Join the 4+ million users, and keep the JSFiddle dream alive.

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Use pre-released features

Fiddle collections

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Console