Motherless gallery keyboard navigation

Increases productivity when you're not being productive. Supports left and right handed browsing (arrow keys or A and D)

You will need to install an extension such as Tampermonkey, Greasemonkey or Violentmonkey to install this script.

You will need to install an extension such as Tampermonkey or Violentmonkey to install this script.

You will need to install an extension such as Tampermonkey or Violentmonkey to install this script.

You will need to install an extension such as Tampermonkey or Userscripts to install this script.

You will need to install an extension such as Tampermonkey to install this script.

You will need to install a user script manager extension to install this script.

(I already have a user script manager, let me install it!)

You will need to install an extension such as Stylus to install this style.

You will need to install an extension such as Stylus to install this style.

You will need to install an extension such as Stylus to install this style.

You will need to install a user style manager extension to install this style.

You will need to install a user style manager extension to install this style.

You will need to install a user style manager extension to install this style.

(I already have a user style manager, let me install it!)

// ==UserScript==
// @name        Motherless gallery keyboard navigation
// @namespace   niceme.me
// @description Increases productivity when you're not being productive. Supports left and right handed browsing (arrow keys or A and D)
// @include     http://motherless.com/*
// @version     1.1
// @grant       none
// ==/UserScript==
if ($('.previous-link').attr('href') != 'undefined') {
  prevUrl = 'http://motherless.com' + $('.previous-link').attr('href');
  nextUrl = 'http://motherless.com' + $('.next-link').attr('href');
}

if (prevUrl != 'http://motherless.comundefined' || nextUrl != 'http://motherless.comundefined') {
  window.addEventListener('keydown', function (e) {
    if (((e.key == 'ArrowRight' || e.key == 'd') ||  // Firefox
         (e.keyCode == 39 || e.keyCode == 68)) && // Chrome
         nextUrl != 'http://motherless.comundefined') {
        document.location.href = nextUrl;
    } else if (((e.key == 'ArrowLeft' || e.key == 'a') || // Firefox
               (e.keyCode == 37 || e.keyCode == 65)) // Chrome
               && prevUrl != 'http://motherless.comundefined') {
      document.location.href = prevUrl;
    }
  });
}