JavaScriptで特定のフォント（文字列）がインストールされているかどうかを調べる

JavaScriptでは、フォント関連の操作が上手くできないことが多いです。インストールされているフォントの一覧の取得など、現在実用的な方法がないような場合も多いです。

今回はその中でも数少ない、フォント関連でJavaScriptができることの一つ、特定のフォントがインストールされているかどうかを調べる方法を紹介します。

定義

以下のJavaScriptを読み込むことで、特定のフォントがインストールされているかどうかを調べるグローバル関数isInstalledFont()が定義されます。

(function (w, d, f) {
    var defaultCheckString = "!\"#$%&'()*+,-./0123456789:;<=>?@ABCDEFGHIJKLMNOPQRSTUVWXYZ[\\]^_`abcdefghijklmnopqrstuvwxyz{|}~";
    var regex = /"/g;
    f = f.replace(regex, '\"');

    var style = d.createElement('style');
    d.head.appendChild(style);
    style.sheet.insertRule('@font-face{font-family:' + f + ';src:url("data:font/opentype;base64,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AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAABAAAAAA==");}', 0);

    var element = d.createElement('span');
    element.style.fontSize = '1rem';
    isInstalledFont();

    /**
     * 指定したフォントがインストールされているかどうかを返す
     * @param {string} [font] - フォント名
     * @param {string} [checkString] - 確認する文字列
     * @returns {boolean}
     */
    function isInstalledFont(font, checkString) {
        element.innerHTML = toString(checkString) || defaultCheckString;
        element.style.fontFamily = '"' + toString(font).replace(regex, '\"') + '",' + f;
        d.body.appendChild(element);
        var result = element.offsetWidth > 1;
        d.body.removeChild(element);
        return result;
    }

    function toString(value) {
        if (value == null) return '';
        if (typeof value == 'string') return value;
        if (Array.isArray(value)) return value.map(toString) + '';
        var result = value + '';
        return '0' == result && 1 / value == -(1 / 0) ? '-0' : result;
    }

    w.isInstalledFont = isInstalledFont;
})(window, document, 'Blank');

念のため、minifyしたコードはこちらから取得できます。

動作

isInstalledFont()関数は、第一引数に「フォント名」、第二引数に「フォントの存在確認に使用する文字列」を指定します。第二引数はオプションで、指定しなければ全ての英数字記号が使用されます。

例えば、「ヒラギノ角ゴ ProN」がインストールされているかを知りたい場合、以下のようにします。

isInstalledFont('Hiragino Kaku Gothic ProN');
// インストールされていればtrue、されていなければfalse

第二引数を使えば、特定の文字列がインストールされたフォントなのかどうかも調べることができます。

例えば、「Verdana」は有名な英字フォントですが、これには日本語は含まれていません。なので、以下のように判別できます。

isInstalledFont('Verdana');
// true

isInstalledFont('Verdana', 'a');
// true

isInstalledFont('Verdana', 'あ');
// false

原理

この関数では、Adobeによってオープンソースで公開されている「Adobe Blank」というフォントを利用しています。

Adobe Blankは「見えないフォント」です。どんな文字を入力しても、一切の文字を表示しません。文字幅もありません。

この特性を利用しています。

この関数では、調べたいフォントとAdobe Blankをフォントに指定したスタイル（font-family: [調べたいフォント], "Adobe Blank";）を、実際に生成した要素にあてて、文字幅が1pxを超えているかを調べています。

調べたいフォントがインストールされていない場合、Adobe Blankが表示されますので、文字幅は出ません。

なお、このコードでは、JavaScriptで完結させるために、JavaScript内で<style>要素を生成しています。紹介したコードでは、Adobe Blankを"Blank"という名称で定義していますが、衝突が起こるようでしたら、コードの最終行の'Blank'の部分を適当な名前に変更して使用してください。

まとめ

今回は、JavaScriptで特定のフォント（文字列）がインストールされているかどうかを調べる関数を紹介しました。

最近はWebフォントの登場などもあり、フォントの情報を取得したい場面も以前に比べ増えてきました。内心、JavaScript側でフォントに関するインターフェースを用意してほしいと思っていますが、現状はこうやって無理やり実装するしかなさそうです。

ぜひ、利用してみてください。

また、「Adobe Blank」を応用すると、これ以外の使い道もあるかと思います。それも模索してみてはいかがでしょうか。