既定のインタラクティブテーマにはBus blueを使い、フォーカスアウトラインにはCoat of arms blueを使います。エラーのフィードバックには、それぞれ異なるベリー系の色と淡いエラー用背景色を使います。Copperなどのパレットアクセントはヘッダーに使えますが、目立つという理由だけでエラー用の色の代わりにしてはいけません。
<!doctype html><html lang="en"><meta charset="utf-8"><meta name="viewport" content="width=device-width,initial-scale=1"><title>Plan a skills afternoon</title><link rel="stylesheet" href="vendor/hds-core-5.2.2/base.css"><link rel="stylesheet" href="vendor/hds-core-5.2.2/checkbox.css"><link rel="stylesheet" href="vendor/hds-core-5.2.2/selection-group.css"><link rel="stylesheet" href="vendor/hds-core-5.2.2/notification.css"><link rel="stylesheet" href="vendor/hds-core-5.2.2/button.css"><style>*{box-sizing:border-box}body{margin:0;padding:var(--spacing-layout-s) var(--spacing-s);font-family:var(--font-default);color:var(--color-black-90)}main{max-width:720px;margin:auto}h1{margin-top:8px}header{border-top:8px solid var(--color-copper);padding-top:var(--spacing-m)}.hds-selection-group{margin:24px 0}.hds-notification{margin:24px 0}.actions{display:flex;gap:16px;flex-wrap:wrap;margin-top:32px}footer{font-size:14px;line-height:1.5;margin-top:32px;border-top:1px solid var(--color-black-20);padding-top:16px}#review{background:var(--color-silver-light);padding:24px;margin-top:24px}[hidden]{display:none!important}@media(max-width:575px){.heading-xl{font-size:var(--fontsize-heading-xl-mobile)}}button{max-width:100%}</style><main class="text-body"><header><small>COMMUNITY SKILLS · LOCAL PLAN</small><h1 class="heading-xl">Plan a skills afternoon</h1><p>Select at least two topics for an example programme. Nothing is registered or sent.</p></header><form id="form" novalidate><div id="summary" class="hds-notification hds-notification--error" hidden><div class="hds-notification__content"><h2 id="summary-heading" class="hds-notification__label" tabindex="-1">Check your topic selection</h2><div class="hds-notification__body"><ul><li><a href="#repair" id="error-link">Choose at least two topics</a></li></ul></div></div></div><fieldset class="hds-selection-group" aria-describedby="hint field-error"><legend class="hds-selection-group__legend">Topics for your afternoon</legend><p id="hint">Choose two or more. You can change your selection before reviewing the plan.</p><div class="hds-selection-group__items hds-selection-group__items--vertical"><div class="hds-checkbox"><input id="repair" type="checkbox" class="hds-checkbox__input" value="Repair and reuse"><label class="hds-checkbox__label" for="repair">Repair and reuse</label></div><div class="hds-checkbox"><input id="digital" type="checkbox" class="hds-checkbox__input" value="Everyday digital skills"><label class="hds-checkbox__label" for="digital">Everyday digital skills</label></div><div class="hds-checkbox"><input id="garden" type="checkbox" class="hds-checkbox__input" value="Urban gardening"><label class="hds-checkbox__label" for="garden">Urban gardening</label></div></div><div id="field-error" class="hds-selection-group__error-text" hidden>Choose at least two topics.</div></fieldset><p id="count" role="status">0 topics selected.</p><div class="actions"><button class="hds-button hds-button--primary" type="submit">Review local plan</button><button id="reset" class="hds-button hds-button--secondary" type="button">Clear selection</button></div></form><section id="review" hidden tabindex="-1"><h2 class="heading-m">Your selected topics</h2><ul id="selected"></ul><p>This is a local review, not a booking confirmation.</p><button id="change" class="hds-button hds-button--secondary">Change topics</button></section><footer>Native HDS Core5.2.2 styles with Arial fallback. Original selection rule and local review. No Helsinki branding, registration or backend.</footer></main><script>let attempted=false;const boxes=[...document.querySelectorAll('input[type=checkbox]')];const values=()=>boxes.filter(x=>x.checked);function validate(focus=false){const n=values().length;document.querySelector('#count').textContent=n+' topics selected.';const bad=attempted&&n<2;document.querySelector('#summary').hidden=!bad;document.querySelector('#field-error').hidden=!bad;boxes.forEach(x=>{if(bad)x.setAttribute('aria-invalid','true');else x.removeAttribute('aria-invalid')});if(bad&&focus)document.querySelector('#summary-heading').focus();return !bad}boxes.forEach(x=>x.onchange=()=>validate());document.querySelector('#error-link').onclick=e=>{e.preventDefault();boxes[0].focus()};document.querySelector('#form').onsubmit=e=>{e.preventDefault();attempted=true;if(!validate(true))return;const list=document.querySelector('#selected');list.replaceChildren();values().forEach(x=>{const li=document.createElement('li');li.textContent=x.value;list.append(li)});document.querySelector('#form').hidden=true;document.querySelector('#review').hidden=false;document.querySelector('#review').focus()};document.querySelector('#change').onclick=()=>{document.querySelector('#form').hidden=false;document.querySelector('#review').hidden=true;boxes[0].focus()};document.querySelector('#reset').onclick=()=>{boxes.forEach(x=>x.checked=false);attempted=false;validate();boxes[0].focus()};</script></html>
npm install [email protected]
# CSS imports in a bundler:
# import 'hds-core/lib/base.css';
# import 'hds-core/lib/components/checkbox/checkbox.css';
# import 'hds-core/lib/components/selection-group/selection-group.css';
# import 'hds-core/lib/components/notification/notification.css';
# import 'hds-core/lib/components/button/button.css';
# In plain HTML, copy these files into public assets and link base.css first.
# HelsinkiGroteskPro is not bundled; the native font stack falls back to Arial.
