selection = [] visited = [] current = 0 playing = 1 document.addEventListener('keyup', function(event) { if(event.keyCode == 37) { prev() } // left else if(event.keyCode == 39) { next() } // right else if(event.keyCode == 32) { toggle_play() } // space else if(event.keyCode == 13) { new_selection() } // enter }); function new_selection() { images = Object.keys(distances) start = images[Math.floor(Math.random()*images.length)] sortable = [] for (file in distances[start]) { if (visited.indexOf(file) == -1) { // not in visited sortable.push([file,distances[start][file]]) // objects cannot be sorted in js, use array instead } } n = 6 selection = [] sorted = sortable.sort(function(a, b) { return a[1] - b[1]; }).slice(0,n); // sort by distance, get first n elements sorted.forEach(function(img,index) { selection.push(img[0]) visited.push(img[0]) }) selection = selection.sort(() => Math.random() - 0.5); // shuffle current = 0 update() } function src(id,path) { document.getElementById(id).src = path } function onclick(id,fun) { document.getElementById(id).onclick = fun } function hide_controls() { document.getElementById("prev").style.display = "none" document.getElementById("next").style.display = "none" } function show_controls() { document.getElementById("prev").style.display = "block" document.getElementById("next").style.display = "block" } function toggle_play() { playing == 1 ? stop() : play() } function play() { playing = 1 interval = setInterval(function () { next() }, 3000); document.getElementById("play-indicator").title = "Pause slideshow" document.getElementById("play-indicator").className = "fa fa-pause" hide_controls() } function stop() { playing = 0 clearInterval(interval) document.getElementById("play-indicator").title = "Play slideshow" document.getElementById("play-indicator").className = "fa fa-play" show_controls() } function prev() { current = (current-1+selection.length) % selection.length // js % cannot handle negative values update() } function next() { current = (current+1) % selection.length update() } function update() { src('image',"https://media.pdp8.info/pictures/"+selection[current]) }