JSFiddle - React, Tailwind, and code Playground

HTML

<link rel="stylesheet" href="http://twitter.github.com/bootstrap/1.4.0/bootstrap.css">
<script src="http://twitter.github.com/bootstrap/1.4.0/bootstrap-modal.js"></script>
<form>
<ul class="inputs-list">
    <li>
      <label>
        <input type="checkbox" name="optionsCheckboxes" value="option1" />
        <span>Option Test</span>
      </label>
    </li>
    <li>
      <label>
        <input type="checkbox" name="optionsCheckboxes" value="option2" />
        <span>Option 2</span>
      </label>
    </li>
</ul>
<div class="actions">
    <a href="#" class="save-button btn large primary">Save changes &raquo;</a>
    
    <!-- Hide the real submit button /-->
    <input type="submit" class="hidden">
</div>
</form>

<div id="my-modal" class="modal hide fade">
    <div class="modal-header">
        <a href="#" class="close">&times;</a>
        <h3>Are you sure?</h3>
    </div>
    <div class="modal-body">
        <p>You haven&rsquo;t selected any options.</p>
    </div>
    <div class="modal-footer">
        <a href="#" class="okay-button btn primary">Okay &raquo;</a>
        <a href="#" class="go-back-button btn secondary">Go back</a>
    </div>
</div> <!-- /modal -->

CSS

ul.inputs-list li {
    margin-left: 10px;
}
.hidden {
    display: none   
}

JavaScript

$(document).ready(function() {

    // Verify if checkboxes were checked.
    // If they weren't, show a modal
    $('a.save-button').click(function() {
        if ($("input:checked").length === 0) {
            
            $('#my-modal').modal({
                show: 'true',
                backdrop: 'true',
                keyboard: 'true'
            });
        } else {
            $('form').submit(); 
        }
        
        // prevent click jump
        return false;
    });

    // Let's attach a listener on form submission
    $('form').submit(function() {
        alert('We submitted the form!');
    });

    // Hide modal if "Go back" is pressed
    $('#my-modal .go-back-button').click(function() {
        $('#my-modal').modal('hide');
        alert('We went back to the form');
    });

    // Hide modal if "Okay" is pressed
    $('#my-modal .okay-button').click(function() {
        $('#my-modal').modal('hide');
        $('form').submit();
    });

});