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JavaScriptでHTMLエスケープ処理

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JavaScriptでHTMLエスケープする必要があったのでメモ。

一般的なWebアプリの場合、基本的にはサーバサイドでのHTMLエスケープが出来てれば問題無いケースが多い。

ただ、例えばDOMからテキストを取得して再度DOMに突っ込む、みたいな処理をクライアントサイドでやろうとした場合は、JavaScriptで改めてHTMLエスケープする必要がある。

ので、JavaScriptで最低限のHTMLエスケープするメソッド作った。

function escape_html (string) {
  if(typeof string !== 'string') {
    return string;
  }
  return string.replace(/[&'`"<>]/g, function(match) {
    return {
      '&': '&amp;',
      "'": '&#x27;',
      '`': '&#x60;',
      '"': '&quot;',
      '<': '&lt;',
      '>': '&gt;',
    }[match]
  });
}

おしまい。

saekis
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