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Example of loading fonts with loadCSS
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<!-- Our font file is fonts.css --> | |
<script> | |
/*! | |
loadCSS: load a CSS file asynchronously. | |
[c]2014 @scottjehl, Filament Group, Inc. | |
Licensed MIT | |
*/ | |
/* exported loadCSS */ | |
function loadCSS( href, before, media, callback ){ | |
"use strict"; | |
// Arguments explained: | |
// `href` is the URL for your CSS file. | |
// `before` optionally defines the element we'll use as a reference for injecting our <link> | |
// By default, `before` uses the first <script> element in the page. | |
// However, since the order in which stylesheets are referenced matters, you might need a more specific location in your document. | |
// If so, pass a different reference element to the `before` argument and it'll insert before that instead | |
// note: `insertBefore` is used instead of `appendChild`, for safety re: http://www.paulirish.com/2011/surefire-dom-element-insertion/ | |
var ss = window.document.createElement( "link" ); | |
var ref = before || window.document.getElementsByTagName( "script" )[ 0 ]; | |
var sheets = window.document.styleSheets; | |
ss.rel = "stylesheet"; | |
ss.href = href; | |
// temporarily, set media to something non-matching to ensure it'll fetch without blocking render | |
ss.media = "only x"; | |
// DEPRECATED | |
if( callback ) { | |
ss.onload = callback; | |
} | |
// inject link | |
ref.parentNode.insertBefore( ss, ref ); | |
// This function sets the link's media back to `all` so that the stylesheet applies once it loads | |
// It is designed to poll until document.styleSheets includes the new sheet. | |
ss.onloadcssdefined = function( cb ){ | |
var defined; | |
for( var i = 0; i < sheets.length; i++ ){ | |
if( sheets[ i ].href && sheets[ i ].href === ss.href ){ | |
defined = true; | |
} | |
} | |
if( defined ){ | |
cb(); | |
} else { | |
setTimeout(function() { | |
ss.onloadcssdefined( cb ); | |
}); | |
} | |
}; | |
ss.onloadcssdefined(function() { | |
ss.media = media || "all"; | |
}); | |
return ss; | |
} | |
// use loadCSS to load fonts.css | |
loadCSS('/fonts.css'); | |
</script> | |
<!-- Provide a fallback in case JavaScript is broken --> | |
<noscript> | |
<link href="/fonts.css" rel="stylesheet" /> | |
</noscript> |
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<!-- Here's an example with Google Web Fonts: Open Sans --> | |
<script> | |
/*! | |
loadCSS: load a CSS file asynchronously. | |
[c]2014 @scottjehl, Filament Group, Inc. | |
Licensed MIT | |
*/ | |
/* exported loadCSS */ | |
function loadCSS( href, before, media, callback ){ | |
"use strict"; | |
// Arguments explained: | |
// `href` is the URL for your CSS file. | |
// `before` optionally defines the element we'll use as a reference for injecting our <link> | |
// By default, `before` uses the first <script> element in the page. | |
// However, since the order in which stylesheets are referenced matters, you might need a more specific location in your document. | |
// If so, pass a different reference element to the `before` argument and it'll insert before that instead | |
// note: `insertBefore` is used instead of `appendChild`, for safety re: http://www.paulirish.com/2011/surefire-dom-element-insertion/ | |
var ss = window.document.createElement( "link" ); | |
var ref = before || window.document.getElementsByTagName( "script" )[ 0 ]; | |
var sheets = window.document.styleSheets; | |
ss.rel = "stylesheet"; | |
ss.href = href; | |
// temporarily, set media to something non-matching to ensure it'll fetch without blocking render | |
ss.media = "only x"; | |
// DEPRECATED | |
if( callback ) { | |
ss.onload = callback; | |
} | |
// inject link | |
ref.parentNode.insertBefore( ss, ref ); | |
// This function sets the link's media back to `all` so that the stylesheet applies once it loads | |
// It is designed to poll until document.styleSheets includes the new sheet. | |
ss.onloadcssdefined = function( cb ){ | |
var defined; | |
for( var i = 0; i < sheets.length; i++ ){ | |
if( sheets[ i ].href && sheets[ i ].href === ss.href ){ | |
defined = true; | |
} | |
} | |
if( defined ){ | |
cb(); | |
} else { | |
setTimeout(function() { | |
ss.onloadcssdefined( cb ); | |
}); | |
} | |
}; | |
ss.onloadcssdefined(function() { | |
ss.media = media || "all"; | |
}); | |
return ss; | |
} | |
// use loadCSS to load fonts.css | |
loadCSS('//fonts.googleapis.com/css?family=Open+Sans'); | |
</script> | |
<!-- Provide a fallback in case JavaScript is broken --> | |
<noscript> | |
<link href='http://fonts.googleapis.com/css?family=Open+Sans' rel='stylesheet' type='text/css'> | |
</noscript> |
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