I have the following bootstrap 3 modal
<!-- SignUp Modal -->
<div style="display: none;" class="modal fade" id="signUpModal" tabindex="-1" role="dialog" aria-labelledby="signUpModalLabel" aria-hidden="true">
<div class="modal-dialog">
<div class="modal-content">
<div class="modal-header">
<h4 class="modal-title" id="signUpModalLabel">Sign up</h4>
</div>
<div class="modal-body">
<input type="email" name="newsletter_email" value="" placeholder="Please insert email..." required>
</div>
<div class="modal-footer">
<input type="submit" name="submit" value="Submit" class="button" />
</div>
</div>
</div>
</div>
<!-- /.SignUp Modal -->
<script type="text/javascript">
$(document).ready(function(){
$("#signUpModal").modal("show");
});
</script>
How can I avoid it being closed by clicking outside of it (please not that I removed the close buttons from the modal)