google-search-result-helper.user.js

// ==UserScript==
// @name         google-search-result-helper
// @namespace    https://github.com/nhosoya
// @version      0.2.8
// @description  Shortcut(j, k, /) for Google search result
// @author       nhosoya
// @include      https://www.google.co.jp/search?*
// @include      https://www.google.com/search?*
// @require      https://cdnjs.cloudflare.com/ajax/libs/keymaster/1.6.1/keymaster.min.js
// @require      https://cdnjs.cloudflare.com/ajax/libs/jquery/3.2.1/jquery.min.js
// @require      https://cdnjs.cloudflare.com/ajax/libs/Caret.js/0.3.1/jquery.caret.min.js
// @grant        none
// ==/UserScript==

(function () {
  "use strict";

  let focusSearchBox = function () {
    let searchBox = $("form[role='search'] input[type='text']");
    var temp = searchBox.val();
    searchBox.focus();
    searchBox.val("");
    searchBox.val(temp);
    return false;
  };

  var i = -1;
  var resultLinks = $(
    '.g a:not(".fl"):not(".ab_button"):not(".exp-r"):not(".GHDvEf")'
  );

  let focusNextLink = function () {
    i++;
    validateIndex();
    resultLinks[i].focus();
    return false;
  };

  let focusPreviousLink = function () {
    i--;
    validateIndex();
    resultLinks[i].focus();
    return false;
  };

  let validateIndex = function () {
    i = Math.max(i, 0);
    i = Math.min(i, resultLinks.length - 1);
  };

  let startImageSearch = function () {
    if (location.search.includes("tbm=isch")) {
      return false;
    }
    location.href += "&tbm=isch";
    return false;
  };

  key("/", focusSearchBox);
  key("j", focusNextLink);
  key("k", focusPreviousLink);
  key("i", startImageSearch);
})();