bootstrap 4 modal popup on button click code example
Example 1: bootstrap pop modal from another modal
// Hide current modal before opening new one
$("#idModal").modal('hide');
$("#idModal2").modal() // or .modal("show");
// show 1st modal again after closing 2nd modal
$("#idModal2").on('hidden.bs.modal', () => $("#idModal").modal('show'))
// using hide.bs.modal might cause modal to stop scrolling!!!
Example 2: bootstrap 4 modal popup remote url
$('body').on('click', '[data-toggle="modal"]', function(){
$($(this).data("target")+' .modal-body').load($(this).data("remote"));
});