navbar: center active menu item on mobile

parent 98277693
/* Copyright (C) 2018 Pietro Albini <pietroalbini@ubuntu.com>
*
* This program is free software: you can redistribute it and/or modify it
* under the terms of the GNU Affero General Public License as published by the
* Free Software Foundation, either version 3 of the License, or (at your
* option) any later version.
*
* This program is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU Affero General Public License
* for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
function ubuntuit_navbar_center_active() {
var navs = document.querySelectorAll("nav");
for (var i = 0; i < navs.length; i++) {
var active = navs[i].querySelector(".active");
if (active !== undefined) {
var offset = active.getBoundingClientRect().left;
navs[i].scrollBy(offset - window.innerWidth / 2 + active.offsetWidth / 2, 0);
}
}
};
window.addEventListener("load", ubuntuit_navbar_center_active());
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