I am currently rewriting my <header></header> inside an index.html file with JavaScript functions. Every function was working perfectly fine.
The struggle comes with rewriting it as a custom component so I do not have to repeat the header code in every page (there are many). But the functionality is not that easy to rewrite because it seems I do not have access to certain things.
The custom header-component, everything working as expected:
const template = document.createElement('template');
template.innerHTML = `
<style>
.content-container {
color: inherit;
margin-inline: auto;
max-width: 73.75rem;
width: 90vw;
}
.header {
display: block;
background-color: inherit;
width: 100%;
}
a {
color: inherit;
font-size: 1.125rem;
text-decoration: none;
}
ul {
background-color: inherit;
list-style: none;
padding-left: 0;
}
.header-container {
align-items: center;
display: flex;
gap: 1.5rem;
padding: 1rem 0;
}
.logo {
flex-shrink: 1;
height: 100%;
max-height: 3.375rem;
max-width: 15.5rem;
padding-left: unset;
width: 100%;
}
.nav-top {
flex-grow: 1;
text-align: end;
}
.nav-top a:hover,
.active {
color: var(--clr-primary);
border-block-end: 2px solid var(--clr-primary);
}
.opened ul {
background-color: var(--bg-primary);
display: block;
position: absolute;
right: 0;
width: 50%;
z-index: 1;
}
.opened .has-submenu ul {
width: 100%;
}
.opened ul li {
padding: 0.5rem;
}
.opened ul li.has-submenu {
display: flex;
flex-direction: column;
height: min-content;
}
.has-submenu ul {
display: block;
position: relative;
}
.opened ul li .active {
border-block-end: unset;
}
.closed ul {
display: none;
}
.nav-top.opened a {
display: block;
text-align: left;
}
.header-container .btn-primary {
display: none;
}
.btn-menu {
background-color: var(--bg-tertiary);
border: 0;
font-size: inherit;
padding: 1em;
}
.btn {
border: none;
}
.btn-primary {
background-color: var(--bg-tertiary);
color: var(--clr-primary);
display: block;
font-size: 1.125rem;
padding: 1rem 1.5rem;
text-align: center;
}
@media screen and (min-width: 790px) {
.nav-top .btn-menu {
display: none;
}
.nav-list li {
display: inline-block;
margin: 1rem;
}
.nav-list li.has-submenu {
position: relative;
}
.nav-list li.has-submenu ul {
display: none;
}
.closed ul,
.opened ul {
display: inherit;
}
.nav-list li.has-submenu:hover ul {
background: var(--bg-primary);
display: block;
left: 0;
position: absolute;
right: 0;
text-align: left;
top: 100%;
width: fit-content;
width: -moz-fit-content;
}
}
@media screen and (min-width: 1020px) {
.header-container .btn-primary {
display: block;
}
.nav-top {
text-align: center;
}
}
</style>
<header id="header" class="header hero">
<div class="content-container">
<div class="header-container">
<a href="../index.html" aria-label="Homepage" class="logo">
<img src="/assets/logo.svg" width="248" height="54" alt="">
</a>
<nav class="nav-top closed" id="nav-top" aria-label="Main">
<button type="button" id="btn-menu" class="btn btn-menu" aria-expanded="false" aria-controls="menu">
Menü
<span class="sr-only">öffnen</span>
</button>
<ul id="nav-list" class="nav-list">
<li><a href="../index.html">Über uns</a></li>
<li class="has-submenu"><a href="../services" aria-expanded="false">Services ↓</a>
<ul>
<li><a href="/planung">Planung</a></li>
<li><a href="/instandhaltung">Instanthaltung</a></li>
<li><a href="/montage+verlagerungen">Montage und Verlagerungen</a></li>
</ul>
</li>
<li class="has-submenu">
<a href="../produkte" aria-expanded="false">Produkte ↓</a>
<ul>
<li><a href="/hebeeinrichtung+hubtische">Hebeeinrichtungen / Hubtische</a></li>
<li><a href="/haengefoerdersysteme">Hängefördersysteme</a></li>
<li><a href="/ketten-undgurtfoerderer">Ketten- und Gurtförderer</a></li>
</ul>
</li>
<li><a href="../kontakt">Kontakt</a></li>
</ul>
</nav>
<a href="../kontakt" class="btn btn-primary">Anfrage senden</a>
</div>
</div>
</header>
`;
class Header extends HTMLElement {
constructor() {
super();
this.showMenu = false;
this.attachShadow({ mode: 'open' });
this.shadowRoot.appendChild(template.content.cloneNode(true));
}
openMenu() {
this.showMenu = !this.showMenu;
const toggle = this.shadowRoot.querySelector('#btn-menu');
const navBar = this.shadowRoot.querySelector('#nav-top');
const show = () => {
toggle.setAttribute('aria-expanded', true);
navBar.classList.remove('closed');
navBar.classList.add('opened');
};
const hide = () => {
toggle.setAttribute('aria-expanded', false);
navBar.classList.remove('opened');
navBar.classList.add('closed');
};
this.showMenu ? show() : hide();
}
connectedCallback() {
this.shadowRoot.querySelector('#btn-menu').addEventListener('click', () => this.openMenu());
}
disconnectedCallback() {
this.shadowRoot.querySelector('#btn-menu').removeEventListener();
}
};
window.customElements.define('header-component', Header);
Now I do have some function with add changes to this header-compontent depending on the window element itself (scroll) or window.size. But I do not have access to anything inside the header-component or using the window outside I do not have access to the elements withing the header-compontent.
How is header or footer typically handled within a large vanilla JS application? I thought custom components is the answer, but adding functionality seem difficult and barely answers on how to rewrite these function (which seem common to me) to use within a custom component.
Functions from index.js
close open menu in mobile view on scroll
const toggle = document.getElementById("btn-menu");
const navBar = document.getElementById("nav-top");
const menuItems = document.getElementById("nav-list").getElementsByTagName("a");
const menuItemsArray = [...menuItems];
window.addEventListener("onscroll", (e) => {
e.stopPropagation();
if (toggle.getAttribute("aria-expanded") == true) {
hide();
}
});
const handleClosure = (e) => !navBar.contains(e.target) && hide();
const handleResize = () => {
if (window.innerWidth > 600) {
navBar.classList.remove("opened");
navBar.classList.add("closed");
}
};
window.addEventListener("click", handleClosure);
window.addEventListener("focusin", handleClosure);
window.addEventListener("resize", handleResize);
menuItemsArray.forEach((item) => {
item.addEventListener("click", hide);
});
Or active menu items
const current = window.location.href;
for (let i = 0; i < menuItems.length; i++) {
if (menuItems[i].href === current) {
menuItems[i].className = "active";
// menuItems[i].focus();
}
}
and some others, I am sure I can figure out myself when I get these working.