Bootstrap 4 uses flex-box for it's modal footers. If I want two buttons, one on the left and one on the right, how do I get it to work properly?
The code below tries to use a div.row with col-sm-6 but doesn't work.
<script src="https://code.jquery.com/jquery-3.1.1.slim.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/tether/1.4.0/js/tether.min.js"></script>
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0-alpha.6/js/bootstrap.min.js"></script>
<link href="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0-alpha.6/css/bootstrap.min.css" rel="stylesheet"/>
<!-- 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="exampleModalLabel" aria-hidden="true">
<div class="modal-dialog" role="document">
<div class="modal-content">
<div class="modal-header">
<h5 class="modal-title" id="exampleModalLabel">Modal title</h5>
<button type="button" class="close" data-dismiss="modal" aria-label="Close">
<span aria-hidden="true">×</span>
</button>
</div>
<div class="modal-body">
...
</div>
<div class="modal-footer">
<div class="row">
<div class="col-sm-6 text-left">
<button type="button" class="btn btn-primary">Save changes</button>
</div>
<div class="col-sm-6 text-right">
<button type="button" class="btn btn-secondary" data-dismiss="modal">Close</button>
</div>
</div>
</div>
</div>
</div>
</div>Now that the modal-footer is "display:flex" in Bootstrap 4, it would be easiest to use the auto-margins. Use mr-auto on the left button.
<div class="modal-footer">
<button type="button" class="btn btn-primary mr-auto">Save changes</button>
<button type="button" class="btn btn-secondary" data-dismiss="modal">Close</button>
</div>
Also see: Left align and right align within div in Bootstrap
Follow-up to comment "What if I need the button on the right to occupy all the space left?" - Use the btn-block class:
<div class="modal-footer">
<button type="button" class="btn btn-primary text-nowrap">Save changes</button>
<button type="button" class="btn btn-secondary btn-block ml-1" data-dismiss="modal">Close</button>
</div>