Add tabs example

examples/element-factory/src/login-form.js

@@ -0,0 +1,43 @@
+import { html, render } from 'lit';
+
+/**
+ * @typedef {Object} LoginFormProperties
+ * @property {string} action;
+ * @property {'get' | 'post' | 'dialog'} method;
+ * @property {(event: Event) => void} onSubmit;
+ */
+
+/**
+ * Renders a login form.
+ * @param {LoginFormProperties} parameters
+ * @returns {HTMLDivElement}
+ */
+export const createLoginForm = ({
+  action = '/login',
+  method = 'post',
+  onSubmit = () => {},
+} = {}) => {
+  const template = html`
+    <form
+      action="${action}"
+      method="${method}"
+      @submit="${onSubmit}"
+      aria-label="Login"
+    >
+      <label>
+        <span>Email</span>
+        <input type="email" name="email" placeholder="Email" />
+      </label>
+      <label>
+        <span>Password</span>
+        <input type="password" name="password" placeholder="Password" />
+      </label>
+      <button type="submit">Login</button>
+    </form>
+  `;
+
+  const container = document.createElement('div');
+  render(template, container);
+
+  return container;
+};

examples/element-factory/src/login-form.test.js

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+import { screen } from '@testing-library/dom';
+import { createLoginForm } from './login-form';
+
+describe('LoginForm', async () => {
+  it('should render a login form', async () => {
+    document.body.replaceChildren(createLoginForm());
+
+    const form = screen.getByRole('form', { name: /login/i });
+
+    expect(form).toBeInTheDocument();
+  });
+
+  it('should render a login form with a custom action', async () => {
+    document.body.replaceChildren(createLoginForm({ action: '/custom' }));
+
+    const form = screen.getByRole('form', { name: /login/i });
+
+    expect(form).toHaveAttribute('action', '/custom');
+  });
+
+  it('should render a login form with a custom method', async () => {
+    document.body.replaceChildren(createLoginForm({ method: 'get' }));
+
+    const form = screen.getByRole('form', { name: /login/i });
+
+    expect(form).toHaveAttribute('method', 'get');
+  });
+});

examples/element-factory/src/secret-input.test.js

@@ -1,9 +1,9 @@
 import { screen } from '@testing-library/dom';
 import userEvent from '@testing-library/user-event';
-import { createSecretInput } from './secret-input.js';
-
 import '@testing-library/jest-dom/vitest';
 
+import { createSecretInput } from './secret-input.js';
+
 describe('createSecretInput', async () => {
   beforeEach(() => {
     vi.spyOn(localStorage, 'getItem').mockReturnValue('test secret');

examples/element-factory/src/tabs.svelte

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+<script>
+  import { onMount } from 'svelte';
+
+  export let tabs = [];
+
+  let tabbedContent = null;
+
+  const selectTab = (event) => {
+    const tab = event.target;
+    const panel = tabbedContent.querySelector(
+      `#${tab.getAttribute('aria-controls')}`,
+    );
+
+    tabbedContent.querySelectorAll('[role="tab"]').forEach((t) => {
+      t.setAttribute('aria-selected', 'false');
+      t.setAttribute('tabindex', '-1');
+    });
+
+    tab.setAttribute('aria-selected', 'true');
+    tab.setAttribute('tabindex', '0');
+
+    tabbedContent.querySelectorAll('[role="tabpanel"]').forEach((p) => {
+      p.hidden = true;
+    });
+
+    panel.hidden = false;
+  };
+</script>
+
+<section bind:this={tabbedContent}>
+  <div role="tablist">
+    {#each tabs as tab, i}
+      {@const tabId = tab.id || i}
+      <button
+        role="tab"
+        id="tab-{tabId}"
+        aria-controls="panel-{tabId}"
+        aria-selected="false"
+        tabindex="-1"
+        on:click={selectTab}
+      >
+        {tab.title}
+      </button>
+    {/each}
+  </div>
+
+  {#each tabs as tab, i}
+    {@const tabId = tab.id || i}
+    <div role="tabpanel" id="panel-{tabId}" hidden>
+      <p>{tab.content}</p>
+    </div>
+  {/each}
+</section>

examples/element-factory/src/tabs.test.js

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+import { render, screen } from '@testing-library/svelte';
+import userEvent from '@testing-library/user-event';
+
+import Tabs from './tabs.svelte';
+
+describe('Tabs', () => {
+  beforeEach(() => {
+    render(Tabs, {
+      tabs: [
+        {
+          label: 'Venue',
+          content: 'This year, we will be at this awesome venue',
+        },
+        { label: 'Lineup', content: 'Check out our exciting lineup!' },
+        { label: 'Tickets', content: 'Buy tickets today!' },
+      ],
+    });
+  });
+
+  it('should render three tabs', async () => {
+    const tabs = screen.getAllByRole('tab');
+    expect(tabs).toHaveLength(3);
+  });
+
+  it('should switch tabs', async () => {
+    const tabs = screen.getAllByRole('tab');
+    const secondTab = tabs[1];
+
+    await userEvent.click(secondTab);
+
+    expect(secondTab).toHaveAttribute('aria-selected', 'true');
+  });
+
+  it('should render the content of the selected tab', async () => {
+    const tabs = screen.getAllByRole('tab');
+    const secondTab = tabs[1];
+
+    await userEvent.click(secondTab);
+
+    const content = screen.getByRole('tabpanel', { hidden: false });
+    expect(content).toHaveTextContent('lineup');
+  });
+});