bootstrap 4 modal not dismissable code example

Example 1: disable close from screen modal popup

<!-- opening with html, the key is the data-backdrop="static" attribute -->
<button data-target="#myModal" data-toggle="modal" data-backdrop="static" data-keyboard="false">
    Launch demo modal
 </button>
 
<script>
//Opening with JS:
$('#myModal').modal({backdrop: 'static', keyboard: false})  
</script>

Example 2: bootstrap modal prevent close

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

Example 3: bootstrap modal don't dismiss

<div class="modal fade" id="myModal" data-backdrop="static" tabindex="-1" role="dialog" aria-labelledby="myModalLabel" aria-hidden="true">