1.md

Changing Shipping Country and Currency

B@SE and JS

Using currency converter - https://dynamicconverter.com/

2.html

<div class="c-dropdown">
  <form method="post" action="" class="currency_form">
    <input type="hidden" name="ship_country">
  <span>Change currency</span>
  <span>
    <select style="margin: 3px" name="dc_selected_currency">
      <option value="AUD">AUD Australian Dollar</option>
      <option value="NZD">NZD New Zealand Dollar</option>
    </select>									
  </span>
  </form>
</div>

3.js

$(document).ready(function(){
// For toggling dropdown  
  $('.c-title') .click(function(){
    $('.currency-wrap').toggleClass('open');
  });
  // Shipping Country Set
  var get_country_selected = localStorage.getItem("country_selected");
  if(typeof(get_country_selected)!== "undefined" && typeof(get_country_selected)!== ""){
    $('.currency_form input[name=ship_country]').val(get_country_selected);
  }	
  // Currency Set
  var currency = localStorage.getItem('cur') || "AUD";
  changeCurrency(currency);		
});

$(document.body).on('change','.currency-wrap select',function(){
 // Event listener that triggers all the functions
  $('.currency-wrap').removeClass('open');
  changeCurrency($(this).val());
  shippingCountryChange($(this).val());
  $('.currency_form').submit();
});

function changeCurrency(currency) {
//   Cosmetic flag image change
  if (currency == 'AUD') {
    $('.c-title').html("<img src='[%ntheme_asset%]img/aud-flag.png[%END ntheme_asset%]'/> $ AUD");
  } else if(currency == 'NZD') {
    $('.c-title').html("<img src='[%ntheme_asset%]img/nzd-flag.png[%END ntheme_asset%]'/> $ NZD");
  }
}
function shippingCountryChange(country) {
//   Sets shipping country in local storage
  if (country == 'NZD'){
    var country_selected = 'NZ';
  }else{
    var country_selected = 'AU';
  }
  $('.currency_form input[name=ship_country]').val(country_selected);
  localStorage.setItem("country_selected",country_selected);
}