JSFiddle - React, Tailwind, and code Playground

HTML

<form method='post' action='doesnt_matter'>
    <input type='text' name='field1' />
    <input type='text' name='field2' />
    </form>

JavaScript

form = document.forms[0];
function up(d,mul)
{
    alert(d);
    form[d].value=mul;
}



up('field1','Hello field 1');
up('field2','Hello field 2');