37 lines
960 B
JavaScript
37 lines
960 B
JavaScript
/**
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* TabPanel web component
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*
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* A simple tab switcher. Reads the `active` attribute to determine which tab
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* is visible. Without JS, both panels are visible (tab buttons hidden via CSS).
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*/
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class TabPanel extends HTMLElement {
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connectedCallback() {
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this.querySelectorAll(".tab-button").forEach((button) => {
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button.addEventListener("click", () => {
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this.setAttribute("active", button.dataset.tab);
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});
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});
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}
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static get observedAttributes() {
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return ["active"];
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}
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attributeChangedCallback(name) {
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if (name === "active") this.#updateVisibility();
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}
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#updateVisibility() {
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const active = this.getAttribute("active");
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this.querySelectorAll(".tab-button").forEach((button) => {
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button.classList.toggle("active", button.dataset.tab === active);
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});
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this.querySelectorAll(".tab-content").forEach((content) => {
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content.hidden = content.dataset.tab !== active;
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});
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}
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}
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customElements.define("tab-panel", TabPanel);
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