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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Basic Usage — MultiSelect</title>
<!-- Shared example styles -->
<link rel="stylesheet" href="examples-shared.css">
</head>
<body>
<div class="container">
<header>
<a href="index.html" class="back-link">← Back to Examples</a>
<h1>Basic Usage</h1>
<p class="subtitle">The essentials, each as ONE live picker you configure with control switches — selection & input mode, content & display, groups, the scroll-to API, and search — plus a declarative, no-JavaScript setup.</p>
</header>
<!-- ============================================================= -->
<!-- BU01 · Selection & input mode -->
<!-- ============================================================= -->
<div class="card">
<h2>BU01 · Selection & Input Mode</h2>
<p>
One picker, many behaviors. Flip between multi- and single-select, add the inline
clear (✕) and the count badge, change the search-input mode (a <code>readonly</code>
or <code>hidden</code> search gives keyboard-only navigation), toggle
<code>close-on-select</code>, and switch text direction (LTR / RTL).
</p>
<div class="controls">
<label><input type="checkbox" id="sel-multiple" checked> <code>multiple</code></label>
<label><input type="checkbox" id="sel-clear"> <code>show-clear</code> (✕)</label>
<label><input type="checkbox" id="sel-counter"> <code>show-counter</code></label>
<label><input type="checkbox" id="sel-close"> <code>close-on-select</code></label>
</div>
<div class="controls">
<span><code>search-input-mode</code>:</span>
<label><input type="radio" name="sel-sim" value="normal" checked> normal</label>
<label><input type="radio" name="sel-sim" value="readonly"> readonly</label>
<label><input type="radio" name="sel-sim" value="hidden"> hidden</label>
</div>
<div class="controls">
<span><code>dir</code>:</span>
<label><input type="radio" name="sel-dir" value="ltr" checked> ltr</label>
<label><input type="radio" name="sel-dir" value="rtl"> rtl</label>
</div>
<div class="demo-area">
<web-multiselect
id="ex-selection"
value-member="value"
display-value-member="label"
icon-member="icon"
search-placeholder="Search…">
</web-multiselect>
</div>
</div>
<!-- ============================================================= -->
<!-- BU02 · Content & display -->
<!-- ============================================================= -->
<div class="card">
<h2>BU02 · Content & Display</h2>
<p>
Icons and subtitles on the option rows, plus how the current selection is shown in
the control: the <code>badges-display-mode</code> and where badges sit
(<code>badges-position</code>).
</p>
<div class="controls">
<label><input type="checkbox" id="disp-icons" checked> icons</label>
<label><input type="checkbox" id="disp-subtitles" checked> subtitles</label>
</div>
<div class="controls">
<span><code>badges-display-mode</code>:</span>
<label><input type="radio" name="disp-mode" value="badges" checked> badges</label>
<label><input type="radio" name="disp-mode" value="count"> count</label>
<label><input type="radio" name="disp-mode" value="compact"> compact</label>
<label><input type="radio" name="disp-mode" value="partial"> partial</label>
<label><input type="radio" name="disp-mode" value="none"> none</label>
<label id="disp-maxvisible-wrap" style="margin-inline-start:1rem; display:none"><code>badges-max-visible</code>:
<input type="number" id="disp-maxvisible" min="1" max="10" value="3" style="width:3.5rem">
</label>
</div>
<div class="controls">
<span><code>badges-position</code>:</span>
<label><input type="radio" name="disp-pos" value="bottom" checked> bottom</label>
<label><input type="radio" name="disp-pos" value="top"> top</label>
<label><input type="radio" name="disp-pos" value="left"> left</label>
<label><input type="radio" name="disp-pos" value="right"> right</label>
</div>
<div class="controls">
<span><code>selected-order</code>:</span>
<label><input type="radio" name="disp-order" value="as-selected" checked> as-selected</label>
<label><input type="radio" name="disp-order" value="label-asc"> label A→Z</label>
<label><input type="radio" name="disp-order" value="label-desc"> label Z→A</label>
<label><input type="radio" name="disp-order" value="member"> member (year)</label>
<label><input type="radio" name="disp-order" value="custom"> custom (year ↓)</label>
<span class="muted" style="margin-inline-start:0.5rem">selected badges reorder; the value stays as-picked</span>
</div>
<div class="demo-area">
<web-multiselect
id="ex-display"
value-member="value"
display-value-member="label"
icon-member="icon"
subtitle-member="subtitle"
search-placeholder="Search frameworks…">
</web-multiselect>
</div>
</div>
<!-- ============================================================= -->
<!-- BU03 · Groups -->
<!-- ============================================================= -->
<div class="card">
<h2>BU03 · Groups</h2>
<p>
Group options under headers with a <code>group</code> member. Each group header
shows a <strong>count of that group's selected items</strong> (in any mode — open the
dropdown to see it). Turn on <strong>per-group select-all</strong>
(<code>group-select-mode="cascade"</code>) to also put a tristate checkbox on each
header that toggles the whole group — the group name is never itself a value.
Turning on <strong>custom labels</strong> renders the header via
<code>renderGroupLabelContentCallback</code>, whose 2nd arg carries the per-group
selection — here it writes <code>GROUP — N remaining</code>
(<code>selectableCount − selectedCount</code>).
</p>
<div class="controls">
<span><code>group-select-mode</code>:</span>
<label><input type="radio" name="grp-mode" value="none" checked> none</label>
<label><input type="radio" name="grp-mode" value="cascade"> cascade</label>
<label style="margin-inline-start:1rem"><input type="checkbox" id="grp-custom"> custom labels (<code>renderGroupLabelContentCallback</code>)</label>
</div>
<div class="controls">
<span><code>getCountLabelCallback</code>:</span>
<label><input type="radio" name="grp-count" value="bracket" checked> <code>[x]</code> (default)</label>
<label><input type="radio" name="grp-count" value="ratio"> <code>x/y</code></label>
<span class="muted" style="margin-inline-start:0.5rem">drives the in-input counter <em>and</em> each group's count</span>
</div>
<div class="demo-area">
<web-multiselect
id="ex-groups"
value-member="value"
display-value-member="label"
icon-member="icon"
group-member="group"
show-counter
search-placeholder="Search…">
</web-multiselect>
</div>
</div>
<!-- ============================================================= -->
<!-- BU04 · Declarative usage (no JS) — see the full card below -->
<!-- ============================================================= -->
<div class="card">
<h2>BU04 · Declarative Usage (No JavaScript)</h2>
<p>
For simple cases you don't need any script at all — put plain
<code><option></code> / <code><optgroup></code> children inside the element
and the component parses them once from the light DOM. It reads each option's
<code>value</code>, its text, the <code>selected</code> attribute, and
<code>data-icon</code> / <code>data-subtitle</code>. Single-select is
<code>multiple="false"</code>. Even custom styling stays script-free — the
<code>custom-styles</code> attribute injects raw CSS into the shadow DOM (the
declarative twin of <code>customStylesCallback</code>).
</p>
<div class="grid">
<div class="form-group">
<label>Simple choice (single-select)</label>
<web-multiselect id="decl-single" multiple="false" search-placeholder="Select your answer…">
<option value="yes">Yes</option>
<option value="no">No</option>
<option value="maybe" selected>Maybe / I don't know</option>
</web-multiselect>
<small class="form-text">No JavaScript — pure HTML. <code>selected</code> pre-picks an option.</small>
</div>
<div class="form-group">
<label>Multiple fruits (icons + <code>custom-styles</code>)</label>
<web-multiselect id="decl-fruits" search-placeholder="Select fruits…"
custom-styles=".ms__badge { border-radius: 999px; font-weight: 600; }">
<option value="apple" data-icon="🍎">Apple</option>
<option value="banana" data-icon="🍌" selected>Banana</option>
<option value="orange" data-icon="🍊">Orange</option>
<option value="grape" data-icon="🍇" selected>Grape</option>
<option value="strawberry" data-icon="🍓">Strawberry</option>
</web-multiselect>
<small class="form-text">Row icons from <code>data-icon</code>; the pill-shaped badges are pure <code>custom-styles</code> — no JS.</small>
</div>
</div>
<div class="grid mt-1">
<div class="form-group">
<label>Grouped options (<code><optgroup></code>)</label>
<web-multiselect id="decl-grouped" search-placeholder="Select languages…">
<optgroup label="Frontend">
<option value="js" data-icon="🟨">JavaScript</option>
<option value="ts" data-icon="🔷">TypeScript</option>
<option value="html" data-icon="📄">HTML</option>
</optgroup>
<optgroup label="Backend">
<option value="python" data-icon="🐍" selected>Python</option>
<option value="java" data-icon="☕">Java</option>
<option value="go" data-icon="🐹">Go</option>
</optgroup>
</web-multiselect>
<small class="form-text">The <code><optgroup></code> <code>label</code> becomes the group header.</small>
</div>
<div class="form-group">
<label>With subtitles (<code>data-subtitle</code>)</label>
<web-multiselect id="decl-subtitles" search-placeholder="Select framework…">
<option value="react" data-icon="⚛️" data-subtitle="A JavaScript library for building UIs">React</option>
<option value="vue" data-icon="🖖" data-subtitle="The Progressive JavaScript Framework">Vue.js</option>
<option value="svelte" data-icon="🔥" data-subtitle="Cybernetically enhanced web apps" selected>Svelte</option>
</web-multiselect>
<small class="form-text">Second-line descriptions come from <code>data-subtitle</code>.</small>
</div>
</div>
<details class="mt-1">
<summary>Show code</summary>
<pre><code><!-- Single-select, one option pre-picked -->
<web-multiselect multiple="false">
<option value="yes">Yes</option>
<option value="maybe" selected>Maybe</option>
</web-multiselect>
<!-- Grouped, with icons + subtitles + no-JS styling -->
<web-multiselect custom-styles=".ms__badge { border-radius: 999px; }">
<optgroup label="Frontend">
<option value="js" data-icon="🟨">JavaScript</option>
<option value="react" data-icon="⚛️"
data-subtitle="A JS library for building UIs">React</option>
</optgroup>
</web-multiselect></code></pre>
</details>
</div>
<!-- ============================================================= -->
<!-- BU05 · Scroll-to API -->
<!-- ============================================================= -->
<div class="card">
<h2>BU05 · Scroll-to API — <code>scrollToGroup</code> / <code>scrollToValue</code> / <code>scrollToIndex</code></h2>
<p>
Imperative commands that bring an option or group into view. Pair with <code>open()</code>
for an "open + jump" gesture. They work in floating, mobile fullscreen, virtual-scroll
and tree modes, and return <code>false</code> when the target isn't in the current
filtered list. <code>clearSearch()</code> reveals a filtered-out option so you can then
scroll to it.
</p>
<div class="grid">
<div class="form-group">
<label>Grouped (headers)</label>
<div style="display:flex; gap:1rem; align-items:flex-start; flex-wrap:wrap;">
<div style="flex:1 1 220px; min-width:220px;">
<web-multiselect id="scroll-grouped"
value-member="value" display-value-member="label"
icon-member="icon" group-member="group"></web-multiselect>
</div>
<div style="display:flex; flex-direction:column; gap:0.5rem; flex:0 0 auto; min-width:190px;">
<button type="button" data-scroll-grouped="group:backend">▶ group “backend”</button>
<button type="button" data-scroll-grouped="group:database">▶ group “database”</button>
<button type="button" data-scroll-grouped="value:redis">◎ value “redis”</button>
<button type="button" data-scroll-grouped="index:0">⇱ index 0</button>
</div>
</div>
<small class="form-text"><code>scrollToGroup</code> centers the group header.</small>
</div>
<div class="form-group">
<label>Long list + virtual scroll</label>
<div style="display:flex; gap:1rem; align-items:flex-start; flex-wrap:wrap;">
<div style="flex:1 1 220px; min-width:220px;">
<web-multiselect id="scroll-virtual"
value-member="value" display-value-member="label"
enable-virtual-scroll></web-multiselect>
</div>
<div style="display:flex; flex-direction:column; gap:0.5rem; flex:0 0 auto; min-width:190px;">
<button type="button" data-scroll-virtual="value:jp">Japan</button>
<button type="button" data-scroll-virtual="value:us">United States</button>
<button type="button" data-scroll-virtual="value:vn">Vietnam (last)</button>
<button type="button" data-scroll-virtual="clear">clearSearch()</button>
</div>
</div>
<small class="form-text">Virtual mode scrolls by index math — the row need not be rendered yet.</small>
</div>
</div>
<div id="scroll-log" class="log-panel"><div class="muted">scrollTo* return values log here…</div></div>
<details class="mt-1">
<summary>Show code</summary>
<pre><code>el.open();
el.scrollToGroup('backend'); // header centered (or the group's first row in virtual mode)
el.scrollToValue('redis'); // → false if filtered out by the current search
el.scrollToIndex(0);
// Reveal a filtered-out option, then scroll to it:
el.clearSearch();
el.scrollToValue('jp');</code></pre>
</details>
</div>
<!-- ============================================================= -->
<!-- BU06 · Search -->
<!-- ============================================================= -->
<div class="card">
<h2>BU06 · Search</h2>
<p>
<strong>Filter</strong> mode hides non-matches; <strong>navigate</strong> mode keeps
every option visible and jumps focus between matches (<kbd>Ctrl</kbd>/<kbd>Cmd</kbd> +
<kbd>↑</kbd>/<kbd>↓</kbd>). Add a search hint, require a minimum number of characters
before searching, and debounce the query.
</p>
<div class="controls">
<span><code>search-mode</code>:</span>
<label><input type="radio" name="srch-mode" value="filter" checked> filter</label>
<label><input type="radio" name="srch-mode" value="navigate"> navigate</label>
<label style="margin-inline-start:1rem"><input type="checkbox" id="srch-hint"> search hint</label>
</div>
<div class="controls">
<label><code>min-search-length</code>:
<select id="srch-min">
<option value="0" selected>0</option>
<option value="1">1</option>
<option value="2">2</option>
<option value="3">3</option>
</select>
</label>
<label><code>search-debounce</code> (ms):
<select id="srch-deb">
<option value="0" selected>0</option>
<option value="150">150</option>
<option value="300">300</option>
<option value="600">600</option>
</select>
</label>
</div>
<div class="demo-area">
<web-multiselect
id="ex-search"
search-mode="filter"
value-member="id"
display-value-member="name"
icon-member="flag"
search-placeholder="Type to search countries…">
</web-multiselect>
</div>
<div class="note">
<p><strong>When to use each mode:</strong></p>
<ul>
<li><strong>Filter</strong>: large lists you want to narrow down (product catalogs, user lists).</li>
<li><strong>Navigate</strong>: quick selection from a known list (country / state selectors).</li>
</ul>
</div>
</div>
</div>
<script type="module">
import { persistControls } from './examples-controls-store.js';
// ── Datasets ─────────────────────────────────────────────────────
const languages = [
{ value: 'js', label: 'JavaScript', icon: '🟨' },
{ value: 'ts', label: 'TypeScript', icon: '🔷' },
{ value: 'python', label: 'Python', icon: '🐍' },
{ value: 'java', label: 'Java', icon: '☕' },
{ value: 'csharp', label: 'C#', icon: '💜' },
{ value: 'php', label: 'PHP', icon: '🐘' },
{ value: 'ruby', label: 'Ruby', icon: '💎' },
{ value: 'go', label: 'Go', icon: '🐹' }
];
const frameworks = [
{ value: 'react', label: 'React', icon: '⚛️', year: 2013, subtitle: 'A JavaScript library for building user interfaces' },
{ value: 'vue', label: 'Vue.js', icon: '🖖', year: 2014, subtitle: 'The Progressive JavaScript Framework' },
{ value: 'angular', label: 'Angular', icon: '🅰️', year: 2016, subtitle: 'Platform for building web applications' },
{ value: 'svelte', label: 'Svelte', icon: '🔥', year: 2016, subtitle: 'Cybernetically enhanced web apps' },
{ value: 'solid', label: 'Solid', icon: '💎', year: 2018, subtitle: 'Simple and performant reactivity' }
];
const groupedTechnologies = [
{ value: 'react', label: 'React', icon: '⚛️', group: 'frontend' },
{ value: 'vue', label: 'Vue.js', icon: '🖖', group: 'frontend' },
{ value: 'svelte', label: 'Svelte', icon: '🔥', group: 'frontend' },
{ value: 'angular', label: 'Angular', icon: '🅰️', group: 'frontend' },
{ value: 'nodejs', label: 'Node.js', icon: '🟢', group: 'backend' },
{ value: 'django', label: 'Django', icon: '🐍', group: 'backend' },
{ value: 'rails', label: 'Ruby on Rails', icon: '💎', group: 'backend' },
{ value: 'express', label: 'Express', icon: '🚂', group: 'backend' },
{ value: 'postgres', label: 'PostgreSQL', icon: '🐘', group: 'database' },
{ value: 'mongodb', label: 'MongoDB', icon: '🍃', group: 'database' },
{ value: 'redis', label: 'Redis', icon: '🔴', group: 'database' }
];
const allCountries = [
'Afghanistan|af','Albania|al','Algeria|dz','Argentina|ar','Armenia|am','Australia|au','Austria|at',
'Azerbaijan|az','Bahrain|bh','Bangladesh|bd','Belarus|by','Belgium|be','Belize|bz','Bolivia|bo',
'Brazil|br','Bulgaria|bg','Cambodia|kh','Cameroon|cm','Canada|ca','Chile|cl','China|cn','Colombia|co',
'Costa Rica|cr','Croatia|hr','Cuba|cu','Cyprus|cy','Czech Republic|cz','Denmark|dk','Ecuador|ec',
'Egypt|eg','El Salvador|sv','Estonia|ee','Ethiopia|et','Finland|fi','France|fr','Georgia|ge',
'Germany|de','Ghana|gh','Greece|gr','Guatemala|gt','Honduras|hn','Hong Kong|hk','Hungary|hu',
'Iceland|is','India|in','Indonesia|id','Iran|ir','Iraq|iq','Ireland|ie','Israel|il','Italy|it',
'Jamaica|jm','Japan|jp','Jordan|jo','Kazakhstan|kz','Kenya|ke','Kuwait|kw','Latvia|lv','Lebanon|lb',
'Lithuania|lt','Luxembourg|lu','Malaysia|my','Malta|mt','Mexico|mx','Morocco|ma','Nepal|np',
'Netherlands|nl','New Zealand|nz','Nigeria|ng','Norway|no','Oman|om','Pakistan|pk','Panama|pa',
'Paraguay|py','Peru|pe','Philippines|ph','Poland|pl','Portugal|pt','Qatar|qa','Romania|ro',
'Russia|ru','Saudi Arabia|sa','Serbia|rs','Singapore|sg','Slovakia|sk','Slovenia|si',
'South Africa|za','South Korea|kr','Spain|es','Sri Lanka|lk','Sweden|se','Switzerland|ch',
'Taiwan|tw','Thailand|th','Turkey|tr','Ukraine|ua','United Arab Emirates|ae','United Kingdom|uk',
'United States|us','Uruguay|uy','Venezuela|ve','Vietnam|vn'
].map(s => { const [label, value] = s.split('|'); return { value, label }; });
const countriesWithFlags = [
{ id: 1, name: 'Canada', flag: '🇨🇦' }, { id: 2, name: 'United States', flag: '🇺🇸' },
{ id: 3, name: 'Mexico', flag: '🇲🇽' }, { id: 4, name: 'United Kingdom', flag: '🇬🇧' },
{ id: 5, name: 'France', flag: '🇫🇷' }, { id: 6, name: 'Germany', flag: '🇩🇪' },
{ id: 7, name: 'Italy', flag: '🇮🇹' }, { id: 8, name: 'Spain', flag: '🇪🇸' },
{ id: 9, name: 'Japan', flag: '🇯🇵' }, { id: 10, name: 'China', flag: '🇨🇳' },
{ id: 11, name: 'India', flag: '🇮🇳' }, { id: 12, name: 'Brazil', flag: '🇧🇷' },
{ id: 13, name: 'Argentina', flag: '🇦🇷' }, { id: 14, name: 'Australia', flag: '🇦🇺' },
{ id: 15, name: 'New Zealand', flag: '🇳🇿' }, { id: 16, name: 'South Africa', flag: '🇿🇦' },
{ id: 17, name: 'Egypt', flag: '🇪🇬' }, { id: 18, name: 'Nigeria', flag: '🇳🇬' },
{ id: 19, name: 'Russia', flag: '🇷🇺' }, { id: 20, name: 'Poland', flag: '🇵🇱' },
{ id: 21, name: 'Sweden', flag: '🇸🇪' }, { id: 22, name: 'Norway', flag: '🇳🇴' },
{ id: 23, name: 'Denmark', flag: '🇩🇰' }, { id: 24, name: 'Finland', flag: '🇫🇮' },
{ id: 25, name: 'Netherlands', flag: '🇳🇱' }
];
// Emoji-prefixed group labels for the "custom labels" toggle on BU03. The 2nd arg is the
// GroupLabelRenderContext — under cascade it carries the per-group selection, so a custom
// header can write whatever it likes: here "N remaining" (= selectableCount − selectedCount).
// The suffix is left un-dimmed (same weight/color as the group name) so the whole label
// reads dark and legible — a faded suffix is harder to scan. The context also carries the
// presentation (isFullscreen) and is re-invoked when it changes: on the phone fullscreen
// overlay the base rem scales UP for touch, so we render a notch smaller (font-size:0.8em)
// to keep "NAME — N remaining" on one line.
const groupLabelRenderer = (name, ctx) => {
const emojis = { frontend: '🎨', backend: '🔧', database: '🗄️' };
const remaining = ctx ? ctx.selectableCount - ctx.selectedCount : 0;
const suffix = !ctx ? ''
: remaining > 0
? ` — ${remaining} remaining`
: ' — all selected';
const scale = ctx && ctx.isFullscreen ? ' style="font-size:0.8em"' : '';
return `<span class="js-custom-label"${scale}><strong>${emojis[name] || '📦'} ${name.toUpperCase()}</strong>${suffix}</span>`;
};
// Toggle a boolean (presence) attribute.
const boolAttr = (el, name, on) => on ? el.setAttribute(name, '') : el.removeAttribute(name);
document.addEventListener('DOMContentLoaded', () => {
// ── BU01 · Selection & input mode ────────────────────────────
const exSel = document.getElementById('ex-selection');
exSel.options = languages;
exSel.setSelected(['js', 'ts']);
document.getElementById('sel-multiple').addEventListener('change', (e) =>
e.target.checked ? exSel.removeAttribute('multiple') : exSel.setAttribute('multiple', 'false'));
document.getElementById('sel-clear').addEventListener('change', (e) =>
boolAttr(exSel, 'show-clear', e.target.checked));
document.getElementById('sel-counter').addEventListener('change', (e) =>
boolAttr(exSel, 'show-counter', e.target.checked));
document.getElementById('sel-close').addEventListener('change', (e) =>
e.target.checked ? exSel.setAttribute('close-on-select', 'true') : exSel.removeAttribute('close-on-select'));
document.querySelectorAll('input[name="sel-sim"]').forEach((r) =>
r.addEventListener('change', (e) => { if (e.target.checked) exSel.setAttribute('search-input-mode', e.target.value); }));
document.querySelectorAll('input[name="sel-dir"]').forEach((r) =>
r.addEventListener('change', (e) => { if (e.target.checked) exSel.setAttribute('dir', e.target.value); }));
// ── BU02 · Content & display ─────────────────────────────────
const exDisp = document.getElementById('ex-display');
exDisp.options = frameworks;
exDisp.setSelected(['react', 'vue', 'svelte']);
document.getElementById('disp-icons').addEventListener('change', (e) =>
e.target.checked ? exDisp.setAttribute('icon-member', 'icon') : exDisp.removeAttribute('icon-member'));
document.getElementById('disp-subtitles').addEventListener('change', (e) =>
e.target.checked ? exDisp.setAttribute('subtitle-member', 'subtitle') : exDisp.removeAttribute('subtitle-member'));
const maxVisibleWrap = document.getElementById('disp-maxvisible-wrap');
document.querySelectorAll('input[name="disp-mode"]').forEach((r) =>
r.addEventListener('change', (e) => {
if (!e.target.checked) return;
exDisp.setAttribute('badges-display-mode', e.target.value);
// badges-max-visible only applies to partial mode — show it only then.
maxVisibleWrap.style.display = e.target.value === 'partial' ? '' : 'none';
}));
document.querySelectorAll('input[name="disp-pos"]').forEach((r) =>
r.addEventListener('change', (e) => { if (e.target.checked) exDisp.setAttribute('badges-position', e.target.value); }));
document.getElementById('disp-maxvisible').addEventListener('input', (e) => {
const n = parseInt(e.target.value, 10);
if (n >= 1) exDisp.setAttribute('badges-max-visible', String(n));
});
// 'custom' mode uses a comparator; install it once (ignored unless selected-order="custom").
exDisp.selectedOrderCompareCallback = (a, b) => b.year - a.year; // newest first
document.querySelectorAll('input[name="disp-order"]').forEach((r) =>
r.addEventListener('change', (e) => {
if (!e.target.checked) return;
exDisp.setAttribute('selected-order', e.target.value);
// 'member' mode needs a sort-key member; the frameworks carry `year`.
if (e.target.value === 'member') exDisp.setAttribute('selected-order-member', 'year');
}));
// ── BU03 · Groups ────────────────────────────────────────────
const exGroups = document.getElementById('ex-groups');
exGroups.options = groupedTechnologies;
exGroups.setSelected(['react', 'nodejs']);
document.querySelectorAll('input[name="grp-mode"]').forEach((r) =>
r.addEventListener('change', (e) => { if (e.target.checked) exGroups.setAttribute('group-select-mode', e.target.value); }));
document.getElementById('grp-custom').addEventListener('change', (e) =>
exGroups.renderGroupLabelContentCallback = e.target.checked ? groupLabelRenderer : null);
// One formatter for the in-input counter AND each group-header count.
document.querySelectorAll('input[name="grp-count"]').forEach((r) =>
r.addEventListener('change', (e) => {
if (!e.target.checked) return;
exGroups.getCountLabelCallback = e.target.value === 'ratio'
? (s, t) => `${s}/${t}`
: null; // null → default `[x]`
}));
// ── BU04 · Scroll-to API ─────────────────────────────────────
const scrollGrouped = document.getElementById('scroll-grouped');
const scrollVirtual = document.getElementById('scroll-virtual');
const scrollLogEl = document.getElementById('scroll-log');
const scrollLog = (msg) => {
if (!scrollLogEl) return;
if (scrollLogEl.querySelector('.muted')) scrollLogEl.innerHTML = '';
const row = document.createElement('div');
row.style.marginBottom = '0.4rem';
row.textContent = msg;
scrollLogEl.appendChild(row);
scrollLogEl.scrollTop = scrollLogEl.scrollHeight;
};
if (scrollGrouped) scrollGrouped.options = groupedTechnologies;
if (scrollVirtual) scrollVirtual.options = allCountries;
const describeViewport = (el, targetValue) => {
const container = el.shadowRoot && el.shadowRoot.querySelector('.ms__options');
if (!container) { scrollLog(' ↳ (dropdown not open / no list)'); return; }
const crect = container.getBoundingClientRect();
const rows = [...container.querySelectorAll('.ms__option')];
const visible = rows.filter((o) => {
const r = o.getBoundingClientRect();
return r.bottom > crect.top + 1 && r.top < crect.bottom - 1;
});
const label = (o) => (o.querySelector('.ms__option-title') || o).textContent.trim();
const first = visible[0] ? label(visible[0]) : '—';
const last = visible.length ? label(visible[visible.length - 1]) : '—';
let targetNote = '';
if (targetValue != null) {
const hit = visible.find((o) => o.dataset.value === String(targetValue));
targetNote = hit ? ` · target "${label(hit)}" VISIBLE` : ` · target "${targetValue}" NOT in view`;
}
scrollLog(` ↳ scrollTop=${Math.round(container.scrollTop)} · shows "${first}" … "${last}" (${visible.length} rows)${targetNote}`);
};
const runScroll = (el, spec) => {
el.open();
if (spec === 'clear') { el.clearSearch(); scrollLog('clearSearch() — search reset, full list restored'); return; }
const [kind, arg] = spec.split(':');
let ok, target = null;
if (kind === 'group') { ok = el.scrollToGroup(arg); }
else if (kind === 'value') { ok = el.scrollToValue(arg); target = arg; }
else if (kind === 'index') { ok = el.scrollToIndex(Number(arg)); }
const call = kind === 'index' ? `scrollToIndex(${arg})`
: kind === 'group' ? `scrollToGroup('${arg}')`
: `scrollToValue('${arg}')`;
scrollLog(`▶ ${call} → ${ok}`);
setTimeout(() => describeViewport(el, target), 90);
};
document.querySelectorAll('[data-scroll-grouped]').forEach((btn) =>
btn.addEventListener('click', () => runScroll(scrollGrouped, btn.dataset.scrollGrouped)));
document.querySelectorAll('[data-scroll-virtual]').forEach((btn) =>
btn.addEventListener('click', () => runScroll(scrollVirtual, btn.dataset.scrollVirtual)));
// ── BU05 · Search ────────────────────────────────────────────
const exSearch = document.getElementById('ex-search');
exSearch.options = countriesWithFlags;
document.querySelectorAll('input[name="srch-mode"]').forEach((r) =>
r.addEventListener('change', (e) => { if (e.target.checked) exSearch.setAttribute('search-mode', e.target.value); }));
document.getElementById('srch-hint').addEventListener('change', (e) =>
e.target.checked
? exSearch.setAttribute('search-hint', 'Ctrl/Cmd + ↓ / ↑ to jump · Enter to select · Esc to clear')
: exSearch.removeAttribute('search-hint'));
document.getElementById('srch-min').addEventListener('change', (e) =>
exSearch.setAttribute('min-search-length', e.target.value));
document.getElementById('srch-deb').addEventListener('change', (e) =>
exSearch.setAttribute('search-debounce', e.target.value));
// Persist all control switches to localStorage and restore them on
// reload — re-applies to every picker via the listeners wired above.
persistControls('basic');
});
</script>
<!-- Development mode: Load from src -->
<script type="module" src="/src/index.ts"></script>
<script type="module" src="examples-copy-link.js"></script>
<script type="module" src="examples-chapter-nav.js"></script>
</body>
</html>