jQuery Simple Example

HTML

<script src="//www.addressfinder.co.nz/assets/v2/widget.js"></script>
<button>add</button>

CSS

input {
  margin: 0;
  padding: 0;
  width:auto;
  min-width:10px;
}

JavaScript

$(document).ready(function() {
  $("button").on("click", function(evt) {
  var templ = '<input class="zt-calc-input" type="text" value="1">';
  $('button').after(templ);
  });
});