jquery.font/jquery.font.js at master · beseku/jquery.font · GitHub

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/*!
* jquery.font
* http://www.beseku.com/2009/04/22/detecting-installed-fonts-with-jquery/
*
* Copyright (c) 2009 Ben sekulowicz-Barclay
*
* Date: 2009-05-06 (Wed, 06 May 2009)
* Revision: 1.1
*/

jQuery.font = {

	test: function(user_family, base_family, user_weight, base_weight) {

		// Define our defaults
		var base = {family:'monospace', weight:'400'};
		var user = {family:'monospace', weight:'400'};

		// Overwrite our defaults with user supplied values, if required...
		base.family = (typeof(base_family) != 'undefined')? base_family: base.family;
		base.weight = (typeof(base_weight) != 'undefined')? base_weight: base.weight;
		user.family = (typeof(user_family) != 'undefined')? user_family: user.family;
		user.weight = (typeof(user_weight) != 'undefined')? user_weight: user.weight;

		// Insert our test paragraph
		$('body').prepend('<p id="jQuery-Font-Test" style="font-family:' + base.family + ';font-size:72px;font-weight:' + base.weight + ';height:auto;left:-9999px;position:absolute;top:-9999px;visibility:hidden;width:auto;">The quick brown fox jumps over a lazy dog.</p>');

		// Get our test paragraph's dimensions
		var baseX = $('p#jQuery-Font-Test').width();
		var baseY = $('p#jQuery-Font-Test').height();

		// Update our test paragraph with the user supplied family.weight
		$('p#jQuery-Font-Test').css({
			'font-family': (user.family + ',' + base.family),
			'font-weight': user.weight
		});

		// Get our test paragraph's dimensions, (again)
		var userX = $('p#jQuery-Font-Test').width();
		var userY = $('p#jQuery-Font-Test').height();

		// Remove our test paragraph
		$('p#jQuery-Font-Test').remove();

		// If the dimensions change, the font has changed(!)
		return(((userY != baseY) || (userX != baseX))? true: false);
	}
};