$('#list-case').prepend('<div class="case-top"></div>'); like $('#list-case').prepend('<div class="case-top"><div class="another-div"></div></div>');?
$('#list-case').prepend('<div class="case-top">' + document.getElementById('name-case').value + '</div>');});document.querySelector('.new-case').on('submit', function(event) {
/*...*/
});