showhide div with button in vanilla js

deine Daten

bla bla

window.onload=function(){ //file upload if(document.body.contains(document.getElementById('showdiv'))){ const z = document.getElementById('showdiv'); const y = document.getElementById('showbutton'); y.addEventListener('click', () => { z.classList.toggle('opendiv'); }); } }

#stammdatendiv.stammdatendiv.opendiv {

    display: block;

}

#stammdatendiv.stammdatendiv {

    display: none;

}