Focus the first visible input text field when you press Esc key, or restore the previously focused element on second press
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// ==UserScript==
// @name Focus input text field on Esc
// @description Focus the first visible input text field when you press Esc key, or restore the previously focused element on second press
// @version 1.0.10
// @include *
// @author wOxxOm
// @namespace wOxxOm.scripts
// @license MIT License
// @run-at document-start
// @grant none
// ==/UserScript==
var TEXT_FIELD = ' search text number url textarea ';
var previousElement;
var scrollPos;
var first;
window.addEventListener('keydown', function (e) {
if (e.defaultPrevented || e.which !== 27 || e.altKey || e.ctrlKey || e.shiftKey || e.metaKey) {
return;
}
if (window !== top) {
rememberFocus();
window.addEventListener('message', maybeRestoreFocus);
top.postMessage(GM_info.script.name, '*');
e.preventDefault();
e.stopPropagation();
return;
}
run();
}, true);
if (window === top) {
window.addEventListener('message', function (e) {
if (e.data === GM_info.script.name) {
run({relayedFromFrame: true});
}
});
}
function run(params) {
// find text inputs inside visible DOM containers
var inputs = [];
populateInputs(inputs);
for (var i = 0, input, il = inputs.length; i < il && (input = inputs[i]); i++) {
var priority = TEXT_FIELD.indexOf(' ' + input.type + ' ');
if (priority < 0) continue;
var n = input, style;
while (n && n.style && (style = getComputedStyle(n)) && style.display !== 'none' && style.visibility !== 'hidden') {
n = n.parentNode;
}
// visible if reached DOM root
if (n && n.style) continue;
// set the first OR if it's empty, try to select an identically named input field with some text (happens on some sites)
if (!first || (
input.value &&
input.name === first.name && (
!input.form && !first.form ||
input.form && first.form && input.form.action === first.form.action
)
)) {
first = input;
if (first.value) break;
}
}
if (!first) return;
var invoke = params && params.relayedFromFrame ? passthru : onkeyup;
if (first !== getActiveElement()) {
rememberFocus();
invoke(setFocus);
} else if (previousElement) {
invoke(restoreFocus);
if (previousElement && previousElement.localName === 'iframe') {
previousElement.contentWindow.postMessage(GM_info.script.name, '*');
}
}
}
function populateInputs(inputs, root) {
var walker = document.createTreeWalker(root || document, NodeFilter.SHOW_ELEMENT);
var el;
while ((el = walker.nextNode())) {
if (el.shadowRoot)
populateInputs(inputs, el.shadowRoot);
if (/^(input|textarea)$/.test(el.localName))
inputs.push(el);
}
}
function getActiveElement() {
var el = document.activeElement;
while (el) {
if (!el.shadowRoot)
return el;
el = el.shadowRoot.activeElement;
}
}
function rememberFocus() {
previousElement = document.activeElement;
scrollPos = [scrollX, scrollY];
}
function setFocus() {
first.focus();
first.select();
}
function restoreFocus() {
// in case document.body (page "background") was previously selected
document.activeElement.blur();
previousElement.focus();
scrollTo(scrollPos[0], scrollPos[1]);
}
function maybeRestoreFocus(e) {
if (e.data === GM_info.script.name) {
restoreFocus();
}
}
// focusing should be done at key-up to prevent the Esc-keydown being also chain-handled by the just focused element
function onkeyup(cb) {
window.addEventListener('keyup', function keyup(e) {
if (e.which !== 27) return;
window.removeEventListener('keyup', keyup);
if (e.defaultPrevented) return;
cb(e);
});
}
function passthru(fn) {
return fn.apply(this, arguments);
}