function fetch(url, id) { var req = new XMLHttpRequest(); req.onload = function() { var element = document.getElementById(id); var node = document.createElement("div"); node.innerHTML = this.response; element.appendChild(node); }; req.open("GET", url); req.send(); } window.onload = function() { var num_members = 0; var num_songs = 0; var add_member_button = document.getElementById('add-member-button'); var add_song_button = document.getElementById('add-song-button'); add_member_button.onclick = function() { num_members += 1; fetch('member/new/' + num_members, 'form-members'); }; add_song_button.onclick = function() { num_songs += 1; fetch('song/new/' + num_songs, 'form-songs'); }; };