html-tools/html-entities.html at main · levups/html-tools · GitHub

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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>HTML Entity Encoder/Decoder</title>
    <link rel="stylesheet" href="common.css">
    <style>
        body {
            display: flex;
            flex-direction: column;
        }
    </style>
</head>
<body>

    <a href="index.html" class="back-link">
        <svg viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round">
            <path d="M19 12H5M12 19l-7-7 7-7"/>
        </svg>
        All Tools
    </a>

    <header>
        <h1>HTML Entity Encoder/Decoder</h1>
        <p class="subtitle">Real-time bidirectional conversion</p>
    </header>

    <div class="controls">
        <button id="clearBtn" class="secondary">Clear All</button>
    </div>

    <div class="container">
        <div class="pane">
            <div class="pane-header">
                <span class="label">
                    <svg class="icon" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2">
                        <path d="M14 2H6a2 2 0 0 0-2 2v16a2 2 0 0 0 2 2h12a2 2 0 0 0 2-2V8z"></path>
                        <polyline points="14 2 14 8 20 8"></polyline>
                    </svg>
                    Plain Text
                </span>
                <button id="copyPlain" class="copy-btn">Copy</button>
            </div>
            <textarea id="plainArea" placeholder="Type or paste text here...

Special characters like <, >, &, &quot; will be encoded." spellcheck="false"></textarea>
        </div>

        <div class="pane">
            <div class="pane-header">
                <span class="label">
                    <svg class="icon" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2">
                        <polyline points="16 18 22 12 16 6"></polyline>
                        <polyline points="8 6 2 12 8 18"></polyline>
                    </svg>
                    HTML Entities
                    <span id="statusIndicator" class="status-indicator"></span>
                </span>
                <button id="copyEncoded" class="copy-btn">Copy</button>
            </div>
            <textarea id="encodedArea" placeholder="Type or paste HTML entities here...

Example: &lt;div&gt; &amp; &quot;text&quot;" spellcheck="false"></textarea>
        </div>
    </div>

    <script>
        const plainArea = document.getElementById('plainArea');
        const encodedArea = document.getElementById('encodedArea');
        const clearBtn = document.getElementById('clearBtn');
        const copyPlain = document.getElementById('copyPlain');
        const copyEncoded = document.getElementById('copyEncoded');
        const statusIndicator = document.getElementById('statusIndicator');

        let updating = false;

        // HTML entities map
        const encodeMap = {
            '&': '&amp;',
            '<': '&lt;',
            '>': '&gt;',
            '"': '&quot;',
            "'": '&#39;',
            '`': '&#96;'
        };

        function encodeHTML(str) {
            return str.replace(/[&<>"'`]/g, char => encodeMap[char]);
        }

        function decodeHTML(str) {
            const textarea = document.createElement('textarea');
            textarea.innerHTML = str;
            return textarea.value;
        }

        function encodePlain() {
            if (updating) return;
            updating = true;

            statusIndicator.className = 'status-indicator';

            const text = plainArea.value;
            if (!text) {
                encodedArea.value = '';
                updating = false;
                return;
            }

            encodedArea.value = encodeHTML(text);
            statusIndicator.className = 'status-indicator valid';

            updating = false;
        }

        function decodePlain() {
            if (updating) return;
            updating = true;

            statusIndicator.className = 'status-indicator';

            const encoded = encodedArea.value;
            if (!encoded) {
                plainArea.value = '';
                updating = false;
                return;
            }

            plainArea.value = decodeHTML(encoded);
            statusIndicator.className = 'status-indicator valid';

            updating = false;
        }

        plainArea.addEventListener('input', encodePlain);
        encodedArea.addEventListener('input', decodePlain);

        clearBtn.addEventListener('click', () => {
            plainArea.value = '';
            encodedArea.value = '';
            statusIndicator.className = 'status-indicator';
            plainArea.focus();
        });

        function setupCopyButton(btn, textarea) {
            btn.addEventListener('click', () => {
                if (!textarea.value) return;
                navigator.clipboard.writeText(textarea.value).then(() => {
                    const originalText = btn.textContent;
                    btn.textContent = 'Copied!';
                    btn.classList.add('copied');
                    setTimeout(() => {
                        btn.textContent = originalText;
                        btn.classList.remove('copied');
                    }, 2000);
                });
            });
        }

        setupCopyButton(copyPlain, plainArea);
        setupCopyButton(copyEncoded, encodedArea);
    </script>
</body>
</html>