JSFiddle - React, Tailwind, and code Playground

by huuzoo

HTML

<input type="text" id="form" onchange="errorCheck()">
<p id="errorText"></p>

JavaScript

function errorCheck() {
	var form = document.getElementById('form');
  if ( form.value.length > 3 ) {
  	form.value = '';
    document.getElementById('errorText').innerHTML = '3文字以内で入力してください。';
  }
}