on click outside modal close code example

Example 1: bootstrap modal popup disable click outside

<button data-target="#myModal" data-toggle="modal" data-backdrop="static" data-keyboard="false">
    Launch demo modal
 </button>

Example 2: javascript modal close

$('#closemodal').click(function() {
    $('#modalwindow').modal('hide');
});

Example 3: add event listener on modal close

$('#registration-exams-modal').on('hidden.bs.modal', function () {
  alert('close');
})

Example 4: prevent close modal when click outside

$('#myModal').modal({
    backdrop: 'static',
    keyboard: false
})

or in HTML
<a data-controls-modal="your_div_id" data-backdrop="static" data-keyboard="false" href="#">