Solved it with putting a window watcher into my vue component but that only triggers on the specific textarea, which I marked with a certain ID, different for each component.
This code below is in my component.
ready(){
let vm = this;
let form = "#new-under-"+this.thing.id+">textarea";
window.addEventListener('keydown', function(e) {
if ( $(form+':focus').length > 0 ) {
// INPUT AREAS IN FOCUS
switch(e.keyCode) {
case 13:
if (e.shiftKey){
console.log('shift enter');
break;
}
console.log('normal enter');
e.preventDefault();
vm.addNew();
break;
} // end switch
}
});
},