hmn/public/js/tabs.js

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JavaScript
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function TabState(tabbed) {
this.container = tabbed;
this.tabs = tabbed.querySelector(".tab");
this.tabbar = document.createElement("div");
this.tabbar.classList.add("tab-bar");
this.container.insertBefore(this.tabbar, this.container.firstChild);
this.current_i = -1;
this.tab_buttons = [];
}
function switch_tab_old(state, tab_i) {
return function() {
if (state.current_i >= 0) {
state.tabs[state.current_i].classList.add("hidden");
state.tab_buttons[state.current_i].classList.remove("current");
}
state.tabs[tab_i].classList.remove("hidden");
state.tab_buttons[tab_i].classList.add("current");
var hash = "";
if (state.tabs[tab_i].hasAttribute("data-url-hash")) {
hash = state.tabs[tab_i].getAttribute("data-url-hash");
}
window.location.hash = hash;
state.current_i = tab_i;
};
}
document.addEventListener("DOMContentLoaded", function() {
const tabContainers = document.getElementsByClassName("tabbed");
for (const container of tabContainers) {
const tabBar = document.createElement("div");
tabBar.classList.add("tab-bar");
container.insertAdjacentElement('afterbegin', tabBar);
const tabs = container.querySelectorAll(".tab");
for (let i = 0; i < tabs.length; i++) {
const tab = tabs[i];
tab.classList.toggle('dn', i > 0);
const slug = tab.getAttribute("data-slug");
// TODO: Should this element be a link?
const tabButton = document.createElement("div");
tabButton.classList.add("tab-button");
tabButton.classList.toggle("current", i === 0);
tabButton.innerText = tab.getAttribute("data-name");
tabButton.setAttribute("data-slug", slug);
tabButton.addEventListener("click", () => {
switchTab(container, slug);
});
tabBar.appendChild(tabButton);
}
const initialSlug = window.location.hash;
if (initialSlug) {
switchTab(container, initialSlug.substring(1));
}
}
});
function switchTab(container, slug) {
const tabs = container.querySelectorAll('.tab');
let didMatch = false;
for (const tab of tabs) {
const slugMatches = tab.getAttribute("data-slug") === slug;
tab.classList.toggle('dn', !slugMatches);
if (slugMatches) {
didMatch = true;
}
}
const tabButtons = document.querySelectorAll(".tab-button");
for (const tabButton of tabButtons) {
const buttonSlug = tabButton.getAttribute("data-slug");
tabButton.classList.toggle('current', slug === buttonSlug);
}
if (!didMatch) {
// switch to first tab as a fallback
tabs[0].classList.remove('dn');
tabButtons[0].classList.add('current');
}
window.location.hash = slug;
}