// ==UserScript==
// @name         imgur scroll to gallery images keyboard shortcuts
// @namespace    http://porath.org/
// @version      0.13
// @description  use ↑/↓ to scroll to the next/previous image within an imgur gallery
// @author       porath
// @match        http://imgur.com/*
// @grant        none
// ==/UserScript==
// thanks to moiph and CBenni and Brybry
var current = 0;
var elems = $('.album-image');
var numElems = elems.length;
$(document).on('keydown', function (key) {
if (key.which == 40) {
key.preventDefault();
if (current + 1 == numElems) {
if ($('#album-truncated')) {
$('#album-truncated > a').click();
window.setTimeout(function() { // wait 200 ms then update the album size
elems = $('.album-image');
numElems = elems.length;
}, 200);
}
return;
}
elems[current + 1].scrollIntoView();
$('body').scrollTop($('body').scrollTop() - 28);
current = current + 1;
}
if (key.which == 38) {
key.preventDefault();
if (current == 0) {
return;
}
elems[current - 1].scrollIntoView();
$('body').scrollTop($('body').scrollTop() - 28);
current = current - 1;
}
if (key.which == 36) { // "home" puts you at the top of the gallery
current = 0;
}
if (key.which == 35) { // "end" puts you at the bottom of the gallery
current = numElems;
}
if (key.which == 37 || key.which == 39) { // when a user presses left or right to go to the prev/next page
current = 0;
elems = $('.album-image');
numElems = elems.length;
}
});