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Enable comfortable [TAB] key navigation by keyboard shortcut on Google search.
// ==UserScript==
// @name Google Tabindexer
// @name:ja Google Tabindexer
// @name:zh-CN Google Tabindexer
// @description Enable comfortable [TAB] key navigation by keyboard shortcut on Google search.
// @description:ja Google の検索結果で [TAB] キーによる快適なキーボード操作を可能にします。
// @description:zh-CN Google 的搜索结果允许使用 [TAB] 键进行舒适的键盘操作。
// @namespace knoa.jp
// @include https://www.google.*/search?*
// @version 1.2.4
// @grant none
// ==/UserScript==
(function(){
const SCRIPTNAME = 'GoogleTabindexer';
const DEBUG = false;/*
[update] 1.2.4
fix for google's update.
[todo]
ターゲット要素に背景色？単純なリンク要素以外だと適用しにくいかな。
ブロック要素の指定も含めて定義するか。
shift戻るときのbottom判定にも使える。
Twitterのみ特殊な件、テキトー対応しただけ
https://www.google.co.jp/search?q=%22%E5%86%AC%E9%87%8E%E3%83%A6%E3%83%9F%22
*/
if(window === top && console.time) console.time(SCRIPTNAME);
const POSITION = (50/100);/* anchor target position scroll to */
const SELECTORS = [
'input[title]',/* search */
'#hdtbSum a:not([tabindex="-1"])',/* top navigations */
'.zTpPx g-link > a',/* special twitter heading */
'#search div.g [data-hveid] > div > a',/**** main headings!! ****/
/* sub pages vary too much */
'[aria-label^="Page"]',/* paging */
'#pnprev',/* paging */
'#pnnext',/* paging */
'#tads a:not([style])[id]',/* ads */
'h3[role="heading"] a',/* images */
'[data-init-vis="true"] g-inner-card a',/* videos */
'lazy-load-item a',/* news */
];
const FOCUSFIRST = '#search div.g [data-hveid] > div > a';
const INDEX = '1';/* set 1 to prevent default tab focuses */
const FLAGNAME = 'tabindexer';/* should be lowercase */
let elements = {}, indexedElements = [];
let core = {
initialize: function(){
core.addTabindex(document.body);
core.focusFirst();
core.observe();
core.tabToScroll();
core.addStyle();
},
addTabindex: function(node){
for(let i = 0; SELECTORS[i]; i++){
let es = node.querySelectorAll(SELECTORS[i]);
if(es === null) log('Not found:', SELECTORS[i]);
for(let j = 0; es[j]; j++){
es[j].tabIndex = INDEX;
es[j].dataset[FLAGNAME] = SELECTORS[i];
}
}
indexedElements = document.querySelectorAll(`[data-${FLAGNAME}]`);
for(let i = 0; indexedElements[i]; i++){
indexedElements[i].previousTabindexElement = indexedElements[i - 1];
indexedElements[i].nextTabindexElement = indexedElements[i + 1];
}
},
focusFirst: function(){
let target = document.querySelector(FOCUSFIRST);
core.showTarget(target);
target.focus();
},
observe: function(){
let body = document.body;
observe(body, function(records){
core.addTabindex(body);
}, {childList: true, subtree: true});
},
tabToScroll: function(){
window.addEventListener('keydown'/*keypress doesn't fire on tab key*/, function(e){
if(e.key !== 'Tab') return;/* catch only Tab key */
if(e.altKey || e.ctrlKey || e.metaKey) return;
let target = (e.shiftKey) ? e.target.previousTabindexElement : e.target.nextTabindexElement;
if(target) core.showTarget(target, e.shiftKey);
}, true);
},
showTarget: function(target, shiftKey){
let scroll = function(x, y, deltaY){
setTimeout(function(){window.scrollTo(x, y + deltaY*(100 - 9**2)/100)}, 0*(1000/60));
setTimeout(function(){window.scrollTo(x, y + deltaY*(100 - 8**2)/100)}, 1*(1000/60));
setTimeout(function(){window.scrollTo(x, y + deltaY*(100 - 7**2)/100)}, 2*(1000/60));
setTimeout(function(){window.scrollTo(x, y + deltaY*(100 - 6**2)/100)}, 3*(1000/60));
setTimeout(function(){window.scrollTo(x, y + deltaY*(100 - 5**2)/100)}, 4*(1000/60));
setTimeout(function(){window.scrollTo(x, y + deltaY*(100 - 4**2)/100)}, 5*(1000/60));
setTimeout(function(){window.scrollTo(x, y + deltaY*(100 - 3**2)/100)}, 6*(1000/60));
setTimeout(function(){window.scrollTo(x, y + deltaY*(100 - 2**2)/100)}, 7*(1000/60));
setTimeout(function(){window.scrollTo(x, y + deltaY*(100 - 1**2)/100)}, 8*(1000/60));
setTimeout(function(){window.scrollTo(x, y + deltaY*(100 - 0**2)/100)}, 9*(1000/60));
};
let innerHeight = window.innerHeight, scrollX = window.scrollX, scrollY = window.scrollY;
let rect = target.getBoundingClientRect()/* rect.top: from top of the window */;
switch(true){
case(shiftKey === true && rect.bottom < innerHeight*POSITION):/* target is above the POSITION */
scroll(scrollX, scrollY, rect.bottom - innerHeight*POSITION);/* position the target to (POSITION) from top */
break;
case(shiftKey === false && innerHeight*(1 - POSITION) < rect.top):/* target is below the POSITION */
scroll(scrollX, scrollY, rect.top - innerHeight*(1 - POSITION));/* position the target to (1 - POSITION) from top */
break;
default:
/* stay scrollY */
break;
}
},
addStyle: function(name = 'style'){
let style = createElement(core.html[name]());
document.head.appendChild(style);
if(elements[name] && elements[name].isConnected) document.head.removeChild(elements[name]);
elements[name] = style;
},
html: {
style: () => `
<style type="text/css">
div.g [data-hveid] > div > a:focus,
g-link a:focus,
g-inner-card a:focus{
outline: 0;
}
div.g [data-hveid] > div > a:focus h3,
g-inner-card a:focus [role="heading"]{
text-decoration: underline;
}
div.g [data-hveid] > div,
g-link,
g-inner-card a [role="heading"]{
position: relative;
overflow: visible !important;
}
div.g [data-hveid] > div > a:focus:before,
g-link a:focus:before,
g-inner-card a:focus [role="heading"]:before{
content: "▶";
font-size: medium;
color: lightgray;
position: absolute;
left: -1.25em;
top: 0.1em;
}
/* pagenation */
a:focus > h3 > div{
background: #eee;
border: 1px solid #ccc;
}
</style>
`,
},
};
const createElement = function(html){
let outer = document.createElement('div');
outer.innerHTML = html;
return outer.firstElementChild;
};
const observe = function(element, callback, options = {childList: true, characterData: false, subtree: false, attributes: false, attributeFilter: undefined}){
let observer = new MutationObserver(callback.bind(element));
observer.observe(element, options);
return observer;
};
const log = function(){
if(!DEBUG) return;
let l = log.last = log.now || new Date(), n = log.now = new Date();
let error = new Error(), line = log.format.getLine(error), callers = log.format.getCallers(error);
//console.log(error.stack);
console.log(
SCRIPTNAME + ':',
/* 00:00:00.000 */ n.toLocaleTimeString() + '.' + n.getTime().toString().slice(-3),
/* +0.000s */ '+' + ((n-l)/1000).toFixed(3) + 's',
/* :00 */ ':' + line,
/* caller.caller */ (callers[2] ? callers[2] + '() => ' : '') +
/* caller */ (callers[1] || '') + '()',
...arguments
);
};
log.formats = [{
name: 'Firefox Scratchpad',
detector: /MARKER@Scratchpad/,
getLine: (e) => e.stack.split('\n')[1].match(/([0-9]+):[0-9]+$/)[1],
getCallers: (e) => e.stack.match(/^[^@]*(?=@)/gm),
}, {
name: 'Firefox Console',
detector: /MARKER@debugger/,
getLine: (e) => e.stack.split('\n')[1].match(/([0-9]+):[0-9]+$/)[1],
getCallers: (e) => e.stack.match(/^[^@]*(?=@)/gm),
}, {
name: 'Firefox Greasemonkey 3',
detector: /\/gm_scripts\//,
getLine: (e) => e.stack.split('\n')[1].match(/([0-9]+):[0-9]+$/)[1],
getCallers: (e) => e.stack.match(/^[^@]*(?=@)/gm),
}, {
name: 'Firefox Greasemonkey 4+',
detector: /MARKER@user-script:/,
getLine: (e) => e.stack.split('\n')[1].match(/([0-9]+):[0-9]+$/)[1] - 500,
getCallers: (e) => e.stack.match(/^[^@]*(?=@)/gm),
}, {
name: 'Firefox Tampermonkey',
detector: /MARKER@moz-extension:/,
getLine: (e) => e.stack.split('\n')[1].match(/([0-9]+):[0-9]+$/)[1] - 6,
getCallers: (e) => e.stack.match(/^[^@]*(?=@)/gm),
}, {
name: 'Chrome Console',
detector: /at MARKER \(<anonymous>/,
getLine: (e) => e.stack.split('\n')[2].match(/([0-9]+):[0-9]+\)$/)[1],
getCallers: (e) => e.stack.match(/[^ ]+(?= \(<anonymous>)/gm),
}, {
name: 'Chrome Tampermonkey',
detector: /at MARKER \((userscript\.html|chrome-extension:)/,
getLine: (e) => e.stack.split('\n')[2].match(/([0-9]+):1\)$/)[1] - 4,
getCallers: (e) => e.stack.match(/[^ ]+(?= \((userscript\.html|chrome-extension:))/gm),
}, {
name: 'Edge Console',
detector: /at MARKER \(eval/,
getLine: (e) => e.stack.split('\n')[2].match(/([0-9]+):[0-9]+\)$/)[1],
getCallers: (e) => e.stack.match(/[^ ]+(?= \(eval)/gm),
}, {
name: 'Edge Tampermonkey',
detector: /at MARKER \(Function/,
getLine: (e) => e.stack.split('\n')[2].match(/([0-9]+):[0-9]+\)$/)[1] - 4,
getCallers: (e) => e.stack.match(/[^ ]+(?= \(Function)/gm),
}, {
name: 'Safari',
detector: /^MARKER$/m,
getLine: (e) => 0,/*e.lineが用意されているが最終呼び出し位置のみ*/
getCallers: (e) => e.stack.split('\n'),
}, {
name: 'Default',
detector: /./,
getLine: (e) => 0,
getCallers: (e) => [],
}];
log.format = log.formats.find(function MARKER(f){
if(!f.detector.test(new Error().stack)) return false;
//console.log('//// ' + f.name + '\n' + new Error().stack);
return true;
});
core.initialize();
if(window === top && console.timeEnd) console.timeEnd(SCRIPTNAME);
})();