Cause back button to close Bootstrap modal windows

backbutton close bootstrap modal

$('div.modal').on('show', function() {
	var modal = this;
	var hash = modal.id;
	window.location.hash = hash;
	window.onhashchange = function() {
		if (!location.hash){
			$(modal).modal('hide');
		}
	}
});

$('div.modal').on('hide', function() {
	var hash = this.id;
	history.pushState('', document.title, window.location.pathname);
});

This seemed to work for me:

 $(".modal").on("shown.bs.modal", function()  { // any time a modal is shown
    var urlReplace = "#" + $(this).attr('id'); // make the hash the id of the modal shown
    history.pushState(null, null, urlReplace); // push state that hash into the url
  });

  // If a pushstate has previously happened and the back button is clicked, hide any modals.
  $(window).on('popstate', function() { 
    $(".modal").modal('hide');
  });

It works fine for me too but I had the problem with 2 or more visible modals in same page, when I wanted to close the top modal, all modal get close, so I changed a little bit the $(window).on('popstate', function() function and fully works.
This is my first conttribution, hope this helps.

  $(window).on('popstate', function() { 
     //$(".modal").modal('hide');
     if ($(".modal:visible").length){                                 // validate that there are visible modal
         $(".modal").eq($(".modal:visible").length-1).modal('hide');  // hide only the last model opened
     }
  });```

Please help me
And here is my modal it is not working bootstrap 3.2.0

### <a href="" data-toggle="modal" data-target="#exampleModal">Mô Tả MP3</a>
<!-- Modal -->
<div class="modal fade" id="exampleModal" tabindex="-1" role="dialog" aria-labelledby="exampleModalLabel" aria-hidden="true">
  <div class="modal-dialog<?php if(mobile()){echo'-centered';}?> modla-lg" role="document">
    <div class="modal-content">
      <div class="modal-header">
        <h5 class="modal-title" id="exampleModalLabel">ஜ۩۞۩ஜ Description ஜ۩۞۩ஜ</h5>
        <button type="button" class="close" data-dismiss="modal" aria-label="Close">
          <span aria-hidden="true">&times;</span>
        </button>
      </div>
      <div class="modal-body">
	  description...........
      </div>
      <div class="modal-footer">
        <button type="button" class="btn btn-secondary" data-dismiss="modal">Close</button>
      </div>
    </div>
  </div>
</div>

<script type="text/javascript">
$('div.modal').on('show.bs.modal', function() {
 	var modal = this;
 	var hash = modal.id;
	window.location.hash = hash;
	window.onhashchange = function() {
		if (!location.hash){
			$(modal).modal('hide');
		}
 	}
 });

 $('div.modal').on('hide', function() {
	var hash = this.id;
	history.pushState('', document.title, window.location.pathname);
 });
</script>