JSFiddle - React, Tailwind, and code Playground

HTML

<textarea id="problem_desc"></textarea>
<button onclick="validateForm()">Validate</button>
<div id="error"></div>
<div id="something"></div>

CSS

#something{
    color: green;
}

JavaScript

function validateForm(theForm) {
    var problem_desc = document.getElementById("problem_desc");

    if (problem_desc.value == '') {
        document.getElementById('error').innerHTML="Write something";
        return false;
    } else {
        document.getElementById('something').innerHTML="Excellent";
        return true;
    }
}