Wie um zu verhindern, dass den Fokus verloren in der bootstrap-modal?

Zusammen mit @SHAZ-Lösung, Sie müssen auch $(window).focus() Funktion zu konzentrieren, die Eingabe als browser-tab im aktiven Zustand

JS:

$(function(){
   $('#myModal').on('shown.bs.modal', function () {
      $('#myTextId').focus()
   });
});

$(window).focus(function () {
   var input = document.getElementById("myTextId").focus();
});

HTML:

<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.6/css/bootstrap.min.css" />
      
<!-- Button trigger modal -->
<button type="button" class="btn btn-primary" data-toggle="modal" data-target="#myModal">
  Launch demo modal
</button>

<!-- Modal -->
<div class="modal fade" id="myModal" tabindex="-1" role="dialog" aria-labelledby="myModalLabel">
  <div class="modal-dialog" role="document">
    <div class="modal-content">
      <div class="modal-header">
        <button type="button" class="close" data-dismiss="modal" aria-label="Close"><span aria-hidden="true">&times;</span></button>
        <h4 class="modal-title" id="myModalLabel">Modal title</h4>
      </div>
      <div class="modal-body">
        <input type="text" id="myTextId" class="form-control" autofocus/>
      </div>
      <div class="modal-footer">
        <button type="button" class="btn btn-default" data-dismiss="modal">Close</button>
        <button type="button" class="btn btn-primary">Save changes</button>
      </div>
    </div>
  </div>
</div>


<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.6/js/bootstrap.min.js"></script>

Fiddle

I have worked on the accessibility fixes for such kind of issues (maintain keyboard focus with the modal pop).

Here is my code :

    $("Your modal id").on('shown.bs.modal', function(event) {
    window.setTimeout(function(){
                $('.close').focus();
            }, 1000);
    });

The above code will FOCUS the pointer to the CLOSE (X) icon in the modal pop up.

To keep the focus (keyboard tab navigation) with the modal:

Once the tab focus comes to the close button :

    <a class="btn btn-default grey_btn" align="center" data-dismiss="modal" onkeydown="focusToClose(event);" href="#" target="_self"><span class="text">Close</span></a>

    function focusToClose(e)
    {
        if((e.key == 'Tab' || e.code == 'Tab') && !e.shiftKey)
        {
            e.preventDefault();
             $('#closeIcon').focus();
        }
    }

    CLOSE (X) button code :
    <button type="button" onKeyDown="blockFocus(event);" class="close" id="closeIcon" data-dismiss="modal" aria-label="Close">
                            <span aria-hidden="true">&times;</span>
                        </button>

Happy coding.. 🙂