JSFiddle - React, Tailwind, and code Playground

HTML

<label>
<input id="accepted1" type="checkbox" />Please accept
</label>
<label>
<input id="accepted2" type="checkbox" /> Please accept2
</label>


<button class="btn" data-toggle="modal" data-target="#warning" data-dismiss="modal" aria-hidden="true">Cancel</button>
<button class="btn btn-primary" type="submit" id="id_complete" name="save" disabled="disabled">Complete Order</button>

JavaScript

$('#accepted1,#accepted2').click(function () {
  if ('#accepted1:checked')
    $('#id_complete').removeAttr('disabled');
  else
    $('#id_complete').attr('disabled','disabled');
});