tftv keyboard shortcuts

Adds keyboard shortcuts for navigating forum pages on teamfortress.tv
Ajankohdalta 15.1.2015. Katso uusin versio.
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// ==UserScript==
// @name        tftv keyboard shortcuts
// @namespace   Lense
// @description Adds keyboard shortcuts for navigating forum pages on teamfortress.tv
// @include     http://teamfortress.tv/thread/*
// @include     https://teamfortress.tv/thread/*
// @version     0.1
// @grant       none
// ==/UserScript==

/*
 * Helper function to scroll to post by id
 */
function goto_post(id) {
  document.getElementById(id).scrollIntoView();
  window.scrollBy(0,-40)
}

/*
 * Find the number of pages in the thread
 */
var lastPage = 1;
var nodeList = document.querySelectorAll(".page-btn");
for(var i=0; i<nodeList.length; i++) {
  if(parseInt(nodeList[i].textContent) > lastPage) {
    lastPage = parseInt(nodeList[i].textContent);
  }
}

/*
 * Find the post number of the top post on the page
 */
var posts = document.querySelectorAll(".post");
var cur_post = 0;

/*
 * Get and process keypresses
 */
document.onkeypress = function (e) {
  // Not entirely sure why this is useful, but it can't break anything that isn't already broken
  e = e || window.event;
  // Ignore keypresses in text boxes
  if(e.target.nodeName != "BODY") {
    // got keypress, but it's probably in a textbox, so ignore it
    return;
  }
  // Current page number
  var page = window.location.search == "" || parseInt(window.location.search.match("page=([0-9]*)")[1]);
  // and yes, I am proud of the logic in that statement.

  switch(e["key"]) {
    /*
     * Pages (left/right)
     */
    case "d":
      if(page != lastPage) {
        page = (page+1).toString();
        window.location.search = "?page=" + page;
      }
      break;
    case "a":
      if(page != 1) {
        page = (page-1).toString();
        window.location.search = "?page=" + page;
      }
      break;
    case "D":
      if(page != lastPage) {
        window.location.search = "?page=" + lastPage.toString();
      }
      break;
    case "A":
      if(page != 1) {
        window.location.search = "?page=1";
      }
      break;
    /*
     * Posts (up/down)
     */
    case "w":
      if(cur_post > 0) {
        cur_post--;
      }
      goto_post(posts[cur_post].id);
      break;
    case "s":
      if(cur_post < posts.length - 1) {
        cur_post++;
      }
      goto_post(posts[cur_post].id);
      break;
    case "W":
      cur_post = 0;
      goto_post(posts[cur_post].id);
      break;
    case "S":
      cur_post = posts.length - 1;
      goto_post(posts[cur_post].id);
      break;
    /*
     * Frags (+/-)
     */
    case "q":
      $.ajax({
        type: 'post',
        data: {},
        url: '/post/frag/' + posts[cur_post].id.slice(8) + '/plus',
      });
      break;
    case "e":
      $.ajax({
        type: 'post',
        data: {},
        url: '/post/frag/' + posts[cur_post].id.slice(8) + '/minus',
      });
      break;
  }};