[javascript] 사용자의 브라우저가 표시 할 수있는 모든 글꼴 나열

위의 Lalit Patel의 Detector에 두 가지 방법을 추가했습니다.

• addFont (family, stylesheetUrl, ruleString)-> ‘family’글꼴이 존재하는지 감지합니다. 그렇지 않은 경우 stylesheetUrl (제공된 경우) 또는 ruleString을 사용하여 글꼴을로드하는 스타일 시트를 추가합니다.
• addFontsArr (arr)-> 글꼴 배열 추가

이를 통해 다음을 수행 할 수 있습니다.

fonts = [ 'Arial', 'Arial Black', { family: 'Lato', stylesheetUrl: 'https://fonts.googleapis.com/css?family=Lato'}, 'Leelawadee UI']
(new FontDetector()).addFontsArr(fonts);

암호:

/**
 * JavaScript code to detect available availability of a
 * particular font in a browser using JavaScript and CSS.
 *
 * Author : Lalit Patel
 * Website: http://www.lalit.org/lab/javascript-css-font-detect/
 * License: Apache Software License 2.0
 *          http://www.apache.org/licenses/LICENSE-2.0
 * Version: 0.15 (21 Sep 2009)
 *          Changed comparision font to default from sans-default-default,
 *          as in FF3.0 font of child element didn't fallback
 *          to parent element if the font is missing.
 * Version: 0.2 (04 Mar 2012)
 *          Comparing font against all the 3 generic font families ie,
 *          'monospace', 'sans-serif' and 'sans'. If it doesn't match all 3
 *          then that font is 100% not available in the system
 * Version: 0.3 (24 Mar 2012)
 *          Replaced sans with serif in the list of baseFonts
 */

/**
 * Usage: d = new Detector();
 *        d.detect('font name');
 */
function FontDetector() {
    this.detect = detect;
    this.addFont = addFont;
    this.addFontsArr = addFontsArr;

    // a font will be compared against all the three default fonts.
    // and if it doesn't match all 3 then that font is not available.
    var baseFonts = ['monospace', 'sans-serif', 'serif'];

    //we use m or w because these two characters take up the maximum width.
    // And we use a LLi so that the same matching fonts can get separated
    var testString = "mmmmmmmmmmlli";

    //we test using 72px font size, we may use any size. I guess larger the better.
    var testSize = '72px';

    var h = document.getElementsByTagName("body")[0];

    // create a SPAN in the document to get the width of the text we use to test
    var s = document.createElement("span");
    s.style.fontSize = testSize;
    s.innerHTML = testString;
    var defaultWidth = {};
    var defaultHeight = {};
    for (var index in baseFonts) {
        //get the default width for the three base fonts
        s.style.fontFamily = baseFonts[index];
        h.appendChild(s);
        defaultWidth[baseFonts[index]] = s.offsetWidth; //width for the default font
        defaultHeight[baseFonts[index]] = s.offsetHeight; //height for the defualt font
        h.removeChild(s);
    }

    function detect(font) {
        var detected = false;
        for (var index in baseFonts) {
            s.style.fontFamily = font + ',' + baseFonts[index]; // name of the font along with the base font for fallback.
            h.appendChild(s);
            var matched = (s.offsetWidth != defaultWidth[baseFonts[index]] || s.offsetHeight != defaultHeight[baseFonts[index]]);
            h.removeChild(s);
            detected = detected || matched;
        }
        return detected;
    }

    function addFont(family, stylesheetUrl, ruleString) {
        if (detect(family)) {
            //console.log('using internal font '+family);
            return true;
        }
        if (stylesheetUrl) {
            console.log('added stylesheet '+stylesheetUrl);
            var head = document.head, link = document.createElement('link');
            link.type = 'text/css';
            link.rel = 'stylesheet';
            link.href = stylesheetUrl;
            head.appendChild(link);
            return true;
        }

        if (ruleString) {
            console.log('adding font rule:'+rule);
            var newStyle = document.createElement('style');
            newStyle.appendChild(document.createTextNode(rule));
            document.head.appendChild(newStyle);
            return true;
        }

        console.log('could not add font '+family);
    }

    function addFontsArr(arr) {
        arr.forEach(a => typeof a==='string' ? addFont(a) : addFont(a.family, a.stylesheetUrl, a.ruleString));
    }
};