JSFiddle - React, Tailwind, and code Playground
HTML
<button class="enable">Enable</button>
<button class="disable">Disable</button>
<input type="text" id="TextBoxID">
JavaScript
$('.enable').click(function(){
document.getElementById('TextBoxID').readOnly = true; //to enable readonly
});
$('.disable').click(function(){
document.getElementById('TextBoxID').readOnly = false;
});