Llamar modal por ID href
<a href="!#" data-toggle="modal" data-target="#login">
</a>
Andrew Lautenbach
<a href="!#" data-toggle="modal" data-target="#login">
</a><script>
var myModal = new bootstrap.Modal(document.getElementById('ModalID'))
myModal.show()
</script> <a href="#" class="btn btn-success " data-toggle="modal" data-target="#exampleModalCenter"><i class="fa fa-pencil fa-lg"></i></a>