JSFiddle - React, Tailwind, and code Playground

by Vitaliy

HTML

<table>
<tr>
    <td>How did you hear about us:</td>
    <td>
        <input type="checkbox" name="advertising" value="tv"/> Advertising on TV <br>
        <input type="checkbox" name="advertising" value="radio"/> Advertising on Radio <br>
        <input type="checkbox" name="advertising" value="internet"/> Advertising Internet <br>
        <input type="checkbox" name="advertising" value="subway"/> Advertising in Subway <br>
        <input type="checkbox" name="advertising" value="other"/> Other <br>
    </td>
</tr>
<tr>
    <td>Other:</td>
    <td>
        <textarea  disabled name="other"></textarea></p>
    </td>
</tr>
</table>

JavaScript

document.querySelector('input[value="other"]').onchange = function(){
	var textarea = document.querySelector('textarea[name="other"]');
	textarea.disabled ? textarea.disabled = false : textarea.disabled = true; 
}