Using jQuery to know when @font-face fonts are loaded?

I am using @font-face and I hate that Firefox shows the default font, waits to load the @font-face font, then replaces it. So the whole page flashes with the new font.

Webkit browsers just don't display the text until the font is loaded and it is a much cleaner look.

So, I am wondering if jQuery could help me to know when all data on the page is loaded, including the @font-face file, so that I can then show my text? Is there a jQuery method that tells me when everything is loaded?

Answers:

Answer

Ok, it was pretty easy. Basically I just set my text to:

a.main {visibility: hidden;}

and then add:

$(window).bind("load", function() {
       $('#nav a.main').addClass('shown');
});

Then make sure that the following is also in my css file:

a.main.shown {visibility: visible;}
Answer

You should't use $(window).bind('load') - that will wait for the whole page to load (which maybe is what you want), and not just the font. If you want to control the loading process of @font-faces use WebFont Loader, developed by Google and Typekit.

You can use it with Google Font API, typekit and your own webfont provider - you (although I never tried it myself as I'm a Typekit User.

Read about it here: http://code.google.com/apis/webfonts/docs/webfont_loader.html and here: http://blog.typekit.com/2010/05/19/typekit-and-google/

Answer

I use google web fonts (Crete Round Regular and Open Sans Regular with Bold)

You can use either this :

var fonts = $.Deferred();
WebFontConfig = { google: { families: [ 'Crete+Round::latin', 'Open+Sans:400,700:latin' ] } , active : function() { fonts.resolve(); } };
(function() {
    var wf = document.createElement('script');
    wf.src = ('https:' == document.location.protocol ? 'https' : 'http') + '://ajax.googleapis.com/ajax/libs/webfont/1/webfont.js';
    wf.type = 'text/javascript';
    wf.async = 'true';
    var s = document.getElementsByTagName('script')[0];
    s.parentNode.insertBefore(wf, s);
})();
fonts.done(function(){ alert('fonts'); });

or this :

WebFontConfig = { google: { families: [ 'Crete+Round::latin', 'Open+Sans:400,700:latin' ] } , active : function() { alert('fonts'); } };
(function() {
    var wf = document.createElement('script');
    wf.src = ('https:' == document.location.protocol ? 'https' : 'http') + '://ajax.googleapis.com/ajax/libs/webfont/1/webfont.js';
    wf.type = 'text/javascript';
    wf.async = 'true';
    var s = document.getElementsByTagName('script')[0];
    s.parentNode.insertBefore(wf, s);
})();

Note that in the first option i used jQuery Deferred Object.

Answer

Perhaps..

Create a z-index: -10 div and fill it with a lot of text (with a 'normal' font). At document.ready() or another event:

var originalnumber = $( div ).width() + $( div ).height() + $( div ).offset().top + $( div ).offset().left;

$( div ).css( 'font-family', 'MyPrettyWebfont' );

var interval = setInterval( function() {
    var number = $( div ).width() + $( div ).height() + $( div ).offset().top + $( div ).offset().left;

    if ( number !== originalnumber ) {
        // webfont is loaded and applied!
        clearInterval( interval );
    }
}, 10 );
Answer

I use this function - tested in Safari, Chrome, Firefox, Opera, IE7, IE8, IE9:

function waitForWebfonts(fonts, callback) {
    var loadedFonts = 0;
    for(var i = 0, l = fonts.length; i < l; ++i) {
        (function(font) {
            var node = document.createElement('span');
            // Characters that vary significantly among different fonts
            node.innerHTML = '[email protected]!-/#';
            // Visible - so we can measure it - but not on the screen
            node.style.position      = 'absolute';
            node.style.left          = '-10000px';
            node.style.top           = '-10000px';
            // Large font size makes even subtle changes obvious
            node.style.fontSize      = '300px';
            // Reset any font properties
            node.style.fontFamily    = 'sans-serif';
            node.style.fontVariant   = 'normal';
            node.style.fontStyle     = 'normal';
            node.style.fontWeight    = 'normal';
            node.style.letterSpacing = '0';
            document.body.appendChild(node);

            // Remember width with no applied web font
            var width = node.offsetWidth;

            node.style.fontFamily = font + ', sans-serif';

            var interval;
            function checkFont() {
                // Compare current width with original width
                if(node && node.offsetWidth != width) {
                    ++loadedFonts;
                    node.parentNode.removeChild(node);
                    node = null;
                }

                // If all fonts have been loaded
                if(loadedFonts >= fonts.length) {
                    if(interval) {
                        clearInterval(interval);
                    }
                    if(loadedFonts == fonts.length) {
                        callback();
                        return true;
                    }
                }
            };

            if(!checkFont()) {
                interval = setInterval(checkFont, 50);
            }
        })(fonts[i]);
    }
};

Use it like:

waitForWebfonts(['MyFont1', 'MyFont2'], function() {
    // Will be called as soon as ALL specified fonts are available
});
Answer

I got the same problem. And somehow i can't get Google webfont loader to work with ttf font (especially chinese fonts) or send a jquery response when font is loaded.

So I came up with this a more basic solution, useful when changing font dynamically after page is loaded. it shows when the font face is properly loaded.

First i create a dummy div and then fill it with 'abcd' and then give it a font size 40, record the width of the div. When the 'change font' event is invoked via a button or anything, it should track the dummy div width changes. Width changes would represent that the font has change.

HTML CODE

<style>
    @font-face {
     font-family: 'font1';
     src:url('somefont.ttf')  format('truetype');
     }
</style>
<div id="dummy" style="border:1px solid #000; display:inline-block">abdc</div>

<!--simple button to invoke the fontchange-->
<input type="button" onclick="javascript:changefont('font1')" value="change the font"/>

JQuery

//create a variable to track initial width of default font
var trackwidth

//when change font is invoke
function changefont(newfont)
{
   //reset dummy font style
    $('#dummy').css('font-family','initial !important;');
    $('#dummy').css({'font-size':'40px'});
    $('#dummy').html('abcd');

    //ensure that trackwidth is only recorded once of the default font
    if(trackwidth==null)
    {
       trackwidth=( $('#dummy').width());
    }

    //apply new font
    $('#dummy').css('font-family',newfont);
    checkwidth()
}

function checkwidth()
{
   //check if div width changed
   if($('#dummy').width() == trackwidth)
    {
        //if div never change, detect again every 500 milisecs
        setTimeout(checkwidth, 500);
    }
    else
    {
      //do something, font is loaded!
    }
}
Answer

I've got the same problem and I'm trying with the readyfunction(), the bind() function and some others that I found, but none of them works. Finaly I found one solution, just aplying one delay before the animation is loaded... like this:

$(document).ready(function() {

setTimeout(function (){
   // The animation
},150);

}); // end ready

I know this is not the best solution, so can someone tell me one better??

Thanks!

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