Marked.jsというMarkdowonパーサ(text -> html)を使ったMarkdowonエディタ
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<!doctype html> <html lang="ja"> <head> <meta charset="utf-8" /> <meta name="viewport" content="width=device-width, initial-scale=1" /> <title>Markdown Editor — Vanilla JS</title> <!-- 最小依存: marked / DOMPurify / highlight.js(任意) をCDNから読み込み --> <script src="https://cdn.jsdelivr.net/npm/marked/marked.min.js"></script> <script src="https://cdn.jsdelivr.net/npm/dompurify@3.1.6/dist/purify.min.js"></script> <link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/highlight.js@11.9.0/styles/github-dark.min.css"> <script src="https://cdn.jsdelivr.net/npm/highlight.js@11.9.0/lib/highlight.min.js"></script> <style> /* ざっくりとしたUIスタイル。Tailwind等なしで動作可 */ :root { --bg: #0b0b0c; --panel: #111214; --text: #e7e7ea; --muted: #9aa0a6; --border: #2a2c30; --accent: #4f46e5; } * { box-sizing: border-box; } html, body { height: 100%; } body { margin: 0; background: var(--bg); color: var(--text); font: 14px/1.6 system-ui, -apple-system, Segoe UI, Roboto, "Noto Sans JP", sans-serif; } header { position: sticky; top: 0; z-index: 10; backdrop-filter: blur(6px); background: color-mix(in oklab, var(--bg) 80%, transparent); border-bottom: 1px solid var(--border); } .wrap { max-width: 1200px; margin: 0 auto; padding: 12px 16px; } .title { font-weight: 700; } .toolbar { display: flex; flex-wrap: wrap; gap: 8px; align-items: center; } .btn { background: var(--panel); border: 1px solid var(--border); color: var(--text); padding: 6px 10px; border-radius: 10px; cursor: pointer; } .btn:hover { background: #17181b; } .btn.secondary { color: var(--muted); } .spacer { flex: 1; } /* 2カラム: 左エディタ / 右プレビュー(中央ドラッグでサイズ変更) */ .grid { display: grid; grid-template-columns: 1fr 8px 1fr; gap: 0; height: calc(100vh - 112px); } .panel { background: var(--panel); border: 1px solid var(--border); border-radius: 12px; overflow: hidden; display: flex; flex-direction: column; } .panel-head { padding: 8px 12px; font-size: 12px; color: var(--muted); border-bottom: 1px solid var(--border); } .panel-body { flex: 1; min-height: 0; overflow: auto; } textarea { width: 100%; height: 100%; background: transparent; color: var(--text); border: 0; outline: none; font: 13px/1.7 ui-monospace, SFMono-Regular, Menlo, Consolas, "Liberation Mono", monospace; padding: 12px; resize: none; caret-color: var(--accent); tab-size: 2; } .preview { padding: 12px 16px; } .divider { cursor: col-resize; background: var(--border); } /* Prose風 見た目(最低限) */ .preview :is(h1,h2,h3) { margin-top: 1.2em; } .preview h1 { font-size: 1.8rem; } .preview h2 { font-size: 1.4rem; } .preview h3 { font-size: 1.2rem; } .preview p, .preview li, .preview code, .preview pre { font-size: 0.95rem; } .preview a { color: #93c5fd; } .preview blockquote { border-left: 4px solid #394150; padding-left: 12px; color: #c3c7ce; } .preview table { border-collapse: collapse; width: 100%; } .preview th, .preview td { border: 1px solid var(--border); padding: 6px 8px; } .preview code { background: #20222a; padding: 2px 4px; border-radius: 6px; } .preview pre { background: #0c0d10; padding: 12px; border-radius: 10px; overflow: auto; } .muted { color: var(--muted); } .kicker { font-size: 12px; color: var(--muted); } @media (max-width: 900px) { .grid { grid-template-columns: 1fr; height: auto; gap: 12px; } .divider { display: none; } } </style> </head> <body> <header> <div class="wrap" style="display:flex; gap: 12px; align-items:center;"> <div class="title">Markdown Editor(Vanilla JS)</div> <div class="kicker" id="themeLabel">テーマ: ダーク</div> <div class="spacer"></div> <div class="toolbar"> <!-- ツールバー(Markdownシンタックスの挿入) --> <button class="btn" data-action="h1">H1</button> <button class="btn" data-action="h2">H2</button> <button class="btn" data-action="bold"><b>B</b></button> <button class="btn" data-action="italic"><i>I</i></button> <button class="btn" data-action="strike">S</button> <button class="btn" data-action="code"></></button> <button class="btn" data-action="list">•</button> <button class="btn" data-action="num">1.</button> <button class="btn" data-action="quote">></button> <button class="btn" data-action="checkbox">☑</button> <button class="btn" data-action="hr">―</button> <div class="spacer"></div> <button class="btn secondary" id="btnTheme">テーマ切替</button> <button class="btn secondary" id="btnExport">書き出し(.md)</button> <label class="btn secondary" for="fileIn">読み込み(.md)</label> <input id="fileIn" type="file" accept=".md,text/markdown,text/plain" style="display:none" /> <button class="btn secondary" id="btnCopyHtml">HTMLコピー</button> <button class="btn secondary" id="btnSample">サンプル読込</button> <button class="btn secondary" id="btnClear">クリア</button> </div> </div> </header> <main class="wrap"> <div class="grid" id="grid"> <!-- 左ペイン: エディタ --> <section class="panel" aria-label="エディタ"> <div class="panel-head">エディタ(Ctrl/⌘+B:太字, Ctrl/⌘+I:斜体)</div> <div class="panel-body"> <textarea id="area" spellcheck="false" placeholder="ここにMarkdownを書いてください…"></textarea> </div> </section> <!-- 仕切り(ドラッグで幅変更) --> <div class="divider" id="divider" role="separator" aria-orientation="vertical" aria-label="サイズ変更バー" tabindex="0"></div> <!-- 右ペイン: プレビュー --> <section class="panel" aria-label="プレビュー"> <div class="panel-head">プレビュー <span class="muted">(サニタイズ済み)</span></div> <div id="preview" class="panel-body preview"></div> </section> </div> <p class="kicker" style="text-align:center; margin: 10px 0 24px;">AutoSave: localStorage / Export: .md / Import: .md / Copy: HTML</p> </main> <script> // ============================ // 設定・定数 // ============================ const LS_KEY = 'md-editor-content-v1'; const LS_THEME = 'md-editor-theme-v1'; // サンプル本文 const SAMPLE = `# ようこそ Markdown エディタへ ✨\n\n右側にプレビューが表示されます。左側で編集してみましょう。\n\n## 主な機能\n- **太字** / *斜体* / ~~取り消し~~\n- [リンク](https://example.com)\n- コード: `console.log('hello')`\n- 箇条書き\n - サブ項目\n- 引用\n> 引用はこんな感じ\n\n---\n\nチェックボックス:\n- [ ] やること1\n- [x] 完了したこと\n\n表:\n\n| 見出しA | 見出しB |\n| --- | --- |\n| セル1 | セル2 |\n\n\n\n\n\n`; // 末尾余白でスクロールの感覚をよくする // markedの設定(GFM, 改行など) marked.setOptions({ gfm: true, breaks: true, headerIds: true, mangle: false }); // 要素参照 const area = document.getElementById('area'); const preview = document.getElementById('preview'); const themeLabel = document.getElementById('themeLabel'); // ============================ // テーマ(ダーク/ライト) // ============================ const applyTheme = (t) => { if (t === 'light') { document.documentElement.style.setProperty('--bg', '#f6f7f8'); document.documentElement.style.setProperty('--panel', '#ffffff'); document.documentElement.style.setProperty('--text', '#0f172a'); document.documentElement.style.setProperty('--muted', '#657084'); document.documentElement.style.setProperty('--border', '#e5e7eb'); document.documentElement.style.setProperty('--accent', '#4f46e5'); themeLabel.textContent = 'テーマ: ライト'; } else { document.documentElement.style.setProperty('--bg', '#0b0b0c'); document.documentElement.style.setProperty('--panel', '#111214'); document.documentElement.style.setProperty('--text', '#e7e7ea'); document.documentElement.style.setProperty('--muted', '#9aa0a6'); document.documentElement.style.setProperty('--border', '#2a2c30'); document.documentElement.style.setProperty('--accent', '#4f46e5'); themeLabel.textContent = 'テーマ: ダーク'; } }; const initialTheme = localStorage.getItem(LS_THEME) || 'dark'; applyTheme(initialTheme); document.getElementById('btnTheme').addEventListener('click', () => { const next = (localStorage.getItem(LS_THEME) || 'dark') === 'dark' ? 'light' : 'dark'; localStorage.setItem(LS_THEME, next); applyTheme(next); }); // ============================ // レンダリング(Markdown → HTML → サニタイズ → プレビュー) // ============================ const render = () => { const raw = marked.parse(area.value || ''); const clean = DOMPurify.sanitize(raw); preview.innerHTML = clean; // コードブロックのハイライト if (window.hljs) { document.querySelectorAll('pre code').forEach((el) => hljs.highlightElement(el)); } }; // ============================ // 入出力(保存/読込/エクスポート/HTMLコピー) // ============================ const save = () => localStorage.setItem(LS_KEY, area.value); const load = () => localStorage.getItem(LS_KEY) || SAMPLE; const exportMd = () => { const blob = new Blob([area.value], { type: 'text/markdown;charset=utf-8' }); const url = URL.createObjectURL(blob); const a = document.createElement('a'); a.href = url; a.download = 'document.md'; a.click(); URL.revokeObjectURL(url); }; const importMd = (file) => { if (!file) return; const reader = new FileReader(); reader.onload = () => { area.value = String(reader.result || ''); onInput(); }; reader.readAsText(file); }; const copyHtml = async () => { try { await navigator.clipboard.writeText(preview.innerHTML); alert('HTMLをコピーしました'); } catch (e) { alert('コピーに失敗しました'); } }; // ============================ // 編集操作(シンタックス挿入) // ============================ const applySyntax = (fn) => { const start = area.selectionStart || 0; const end = area.selectionEnd || 0; const before = area.value.slice(0, start); const sel = area.value.slice(start, end); const after = area.value.slice(end); const replaced = fn(sel); area.value = before + replaced + after; const caret = (before + replaced).length; area.focus(); area.setSelectionRange(caret, caret); onInput(); }; const toolbarActions = { h1: (s) => `# ${s || '見出し1'}`, h2: (s) => `## ${s || '見出し2'}`, bold: (s) => `**${s || '太字'}**`, italic: (s) => `*${s || '斜体'}*`, strike: (s) => `~~${s || '取り消し'}~~`, code: (s) => ``${s || 'code'}``, list: (s) => (s || '項目').split('\n').map(l => `- ${l}`).join('\n'), num: (s) => (s || '項目').split('\n').map((l,i) => `${i+1}. ${l}`).join('\n'), quote: (s) => (s || '引用').split('\n').map(l => `> ${l}`).join('\n'), checkbox: (s) => (s || 'やること').split('\n').map(l => `- [ ] ${l}`).join('\n'), hr: () => `\n\n---\n\n`, }; document.querySelectorAll('[data-action]').forEach(btn => { btn.addEventListener('click', () => { const key = btn.getAttribute('data-action'); const fn = toolbarActions[key]; if (fn) applySyntax(fn); }); }); // ============================ // 入力・ショートカット・ドラッグ&ドロップ // ============================ const onInput = () => { save(); render(); }; area.addEventListener('input', onInput); area.addEventListener('keydown', (e) => { const accel = e.metaKey || e.ctrlKey; if (!accel) return; const k = e.key.toLowerCase(); if (k === 'b') { e.preventDefault(); applySyntax(toolbarActions.bold); } if (k === 'i') { e.preventDefault(); applySyntax(toolbarActions.italic); } }); // ファイル読み込み document.getElementById('fileIn').addEventListener('change', (e) => { const file = e.target.files && e.target.files[0]; importMd(file); e.target.value = ''; }); // ボタン群 document.getElementById('btnExport').addEventListener('click', exportMd); document.getElementById('btnCopyHtml').addEventListener('click', copyHtml); document.getElementById('btnSample').addEventListener('click', () => { area.value = SAMPLE; onInput(); }); document.getElementById('btnClear').addEventListener('click', () => { area.value = ''; onInput(); }); // ドラッグ&ドロップで.md読込 area.addEventListener('dragover', (e) => e.preventDefault()); area.addEventListener('drop', (e) => { e.preventDefault(); const file = e.dataTransfer.files && e.dataTransfer.files[0]; if (file && /\.md$/i.test(file.name)) importMd(file); }); // 仕切りのドラッグで幅変更 const divider = document.getElementById('divider'); const grid = document.getElementById('grid'); let dragging = false; const startDrag = () => dragging = true; const stopDrag = () => dragging = false; const onMove = (clientX) => { const rect = grid.getBoundingClientRect(); const x = Math.min(Math.max(clientX - rect.left, 180), rect.width - 180); // 最小幅を確保 grid.style.gridTemplateColumns = `${x}px 8px 1fr`; }; divider.addEventListener('mousedown', (e) => { startDrag(); onMove(e.clientX); }); window.addEventListener('mousemove', (e) => { if (dragging) onMove(e.clientX); }); window.addEventListener('mouseup', stopDrag); // キーボードでも調整(左右キーで±20px) divider.addEventListener('keydown', (e) => { if (e.key === 'ArrowLeft' || e.key === 'ArrowRight') { e.preventDefault(); const rect = grid.getBoundingClientRect(); const cols = getComputedStyle(grid).gridTemplateColumns.split(' '); const left = parseFloat(cols[0]); const delta = e.key === 'ArrowLeft' ? -20 : 20; const next = Math.min(Math.max(left + delta, 180), rect.width - 180); grid.style.gridTemplateColumns = `${next}px 8px 1fr`; } }); // ============================ // 初期化 // ============================ area.value = load(); render(); </script> </body> </html> |