Can JavaScript Detect All Fonts a User\'s Browser Can Display?
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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