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code cosmetics

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This commit is contained in:
tophf 2018-09-06 19:08:56 +03:00
parent c57fef7b1e
commit 373fe5f510
1 changed files with 18 additions and 8 deletions
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26
js/dom.js
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@ -313,20 +313,30 @@ function initCollapsibles({bindClickOn = 'h2'} = {}) {
}
}
// Makes the focus outline appear on keyboard tabbing, but not on mouse clicks.
function focusAccessibility() {
// Makes the focus outline appear on keyboard tabbing, but not on mouse clicks.
// Since we don't want full layout recalc, we modify only the closest focusable element,
// which we try to find in DOM for this many parentElement jumps:
const focusables = focusAccessibility.ELEMENTS =
['a', 'button', 'input', 'textarea', 'label', 'select', 'summary'];
// last event's focusedViaClick
focusAccessibility.lastFocusedViaClick = false;
// tags of focusable elements;
// to avoid a full layout recalc we modify the closest one
focusAccessibility.ELEMENTS = [
'a',
'button',
'input',
'textarea',
'label',
'select',
'summary',
];
// try to find a focusable parent for this many parentElement jumps:
const GIVE_UP_DEPTH = 4;
addEventListener('mousedown', suppressOutlineOnClick, {passive: true});
addEventListener('keydown', keepOutlineOnTab, {passive: true});
function suppressOutlineOnClick({target}) {
for (let el = target, i = 0; el && i++ < GIVE_UP_DEPTH; el = el.parentElement) {
if (focusables.includes(el.localName)) {
if (focusAccessibility.ELEMENTS.includes(el.localName)) {
if (el.dataset.focusedViaClick === undefined) {
el.dataset.focusedViaClick = '';
focusAccessibility.lastFocusedViaClick = true;
@ -345,7 +355,7 @@ function focusAccessibility() {
return;
}
let el = document.activeElement;
if (!el || !focusables.includes(el.localName)) {
if (!el || !focusAccessibility.ELEMENTS.includes(el.localName)) {
return;
}
if (el.dataset.focusedViaClick !== undefined) {