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fg-loadcss
Advanced tools
loadCSS
A function for loading CSS asynchronously [c]2014 @scottjehl, Filament Group, Inc. Licensed MIT
Usage
Place the loadCSS function inline in the head of your page (it can also be included in an external JavaScript file if preferable).
Then call it by passing it a stylesheet URL:
<head>
...
<script>
// include loadCSS here...
function loadCSS( href, before, media ){ ... }
// load a file
loadCSS( "path/to/mystylesheet.css" );
</script>
<noscript><link href="path/to/mystylesheet.css" rel="stylesheet"></noscript>
...
</head>
Optional Arguments
-
By default, your stylesheet will be inserted before the first
scripttag in the DOM (which may be the one shown above). If you need another insert location, use the optionalbeforeargument to specify a different sibling element. The stylesheet will be inserted before the element you specify. -
You can optionally pass a string to the media argument to set the
media=""of the stylesheet - the default value isall.
Contributions and bug fixes
Both are very much appreciated - especially bug fixes. As for contributions, the goals of this project are to keep things very simple and utilitarian, so if we don't accept a feature addition, it's not necessarily because it's a bad idea. It just may not meet the goals of the project. Thanks!
Usage Example with Content Fonts
Defeating the Flash of Invisible Text (FOIT) is easy with loadCSS. The Flash of Unstyled Text (FOUT) is a feature for progressively rendered web sites—we want our content usable by readers as soon as possible.
// Cut the mustard, choose your own method here—querySelector is an easy one.
if( "querySelector" in win.document ) {
// test for font-face version to load via Data URI'd CSS
var fontFile = "/url/to/woff.css",
ua = window.navigator.userAgent;
// Android's default browser needs TTF instead of WOFF
if( ua.indexOf( "Android 4." ) > -1 && ua.indexOf( "like Gecko" ) > -1 && ua.indexOf( "Chrome" ) === -1 ) {
fontFile = "/url/to/ttf.css";
}
// load fonts
if( fontFile ) {
loadCSS( fontFile );
}
}
Where /url/to/woff.css and /url/to/ttf.css contain something like:
@font-face {
font-family: My Font Family Name;
/* Important: Data URI here to prevent FOIT */
src: url("data:application/x-font-woff;charset=utf-8;base64,...") format("woff");
font-weight: normal;
font-style: normal;
}
FAQs
A function for loading CSS asynchronously
We found that fg-loadcss demonstrated a not healthy version release cadence and project activity because the last version was released a year ago. It has 6 open source maintainers collaborating on the project.
Package last updated on 20 Jan 2015
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