JSFiddle - React, Tailwind, and code Playground

HTML

<script>
   function checkForm(f) {
    if (f.checked) f.checkbox.disabled = 0 
    else f.checkbox.disabled = 1
   }
</script>

<form>   
  <input type="text" onchange="checkForm(this.form)"> 
  <input type="checkbox" name="checkbox">
</form>