List Every Font a User's Browser Can Display
Can JavaScript Retrieve Browser Displayable Fonts?
Yes, it is possible to obtain a list of all fonts supported by the user's browser using JavaScript. This enables the creation of a dropdown containing available fonts for user selection.
Font Detection Implementation
Refer to http://www.lalit.org/lab/javascript-css-font-detect for an efficient JavaScript solution:
Code Snippet:
var Detector = function() { // baseFonts var baseFonts = ['monospace', 'sans-serif', 'serif']; // testString var testString = "mmmmmmmmmmlli"; // testSize var testSize = '72px'; // helper functions var h = document.getElementsByTagName("body")[0]; var s = document.createElement("span"); s.style.fontSize = testSize; s.innerHTML = testString; // default measurements var defaultWidth = {}; var defaultHeight = {}; for (var index in baseFonts) { 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); } this.detect = function(font) { var detected = false; for (var index in baseFonts) { s.style.fontFamily = font + ',' + baseFonts[index]; h.appendChild(s); var matched = (s.offsetWidth != defaultWidth[baseFonts[index]] || s.offsetHeight != defaultHeight[baseFonts[index]]); h.removeChild(s); detected = detected || matched; } return detected; }; };
Working Principle
This code exploits the unique appearance of characters across different fonts. By comparing the width and height of text rendered in a particular font against those rendered in base fonts, it determines if the target font is supported.
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