79 lines
3.1 KiB
JavaScript
79 lines
3.1 KiB
JavaScript
/*! loadCSS. [c]2017 Filament Group, Inc. MIT License */
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(function(w){
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"use strict";
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/* exported loadCSS */
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var loadCSS = function( href, before, media ){
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// Arguments explained:
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// `href` [REQUIRED] is the URL for your CSS file.
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// `before` [OPTIONAL] is the element the script should use as a reference for injecting our stylesheet <link> before
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// By default, loadCSS attempts to inject the link after the last stylesheet or script in the DOM. However, you might desire a more specific location in your document.
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// `media` [OPTIONAL] is the media type or query of the stylesheet. By default it will be 'all'
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var doc = w.document;
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var ss = doc.createElement( "link" );
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var ref;
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if( before ){
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ref = before;
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}
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else {
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var refs = ( doc.body || doc.getElementsByTagName( "head" )[ 0 ] ).childNodes;
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ref = refs[ refs.length - 1];
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}
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var sheets = doc.styleSheets;
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ss.rel = "stylesheet";
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ss.href = href;
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// temporarily set media to something inapplicable to ensure it'll fetch without blocking render
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ss.media = "only x";
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// wait until body is defined before injecting link. This ensures a non-blocking load in IE11.
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function ready( cb ){
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if( doc.body ){
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return cb();
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}
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setTimeout(function(){
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ready( cb );
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});
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}
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// Inject link
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// Note: the ternary preserves the existing behavior of "before" argument, but we could choose to change the argument to "after" in a later release and standardize on ref.nextSibling for all refs
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// Note: `insertBefore` is used instead of `appendChild`, for safety re: http://www.paulirish.com/2011/surefire-dom-element-insertion/
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ready( function(){
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ref.parentNode.insertBefore( ss, ( before ? ref : ref.nextSibling ) );
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});
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// A method (exposed on return object for external use) that mimics onload by polling document.styleSheets until it includes the new sheet.
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var onloadcssdefined = function( cb ){
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var resolvedHref = ss.href;
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var i = sheets.length;
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while( i-- ){
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if( sheets[ i ].href === resolvedHref ){
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return cb();
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}
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}
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setTimeout(function() {
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onloadcssdefined( cb );
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});
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};
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function loadCB(){
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if( ss.addEventListener ){
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ss.removeEventListener( "load", loadCB );
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}
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ss.media = media || "all";
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}
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// once loaded, set link's media back to `all` so that the stylesheet applies once it loads
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if( ss.addEventListener ){
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ss.addEventListener( "load", loadCB);
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}
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ss.onloadcssdefined = onloadcssdefined;
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onloadcssdefined( loadCB );
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return ss;
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};
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// commonjs
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if( typeof exports !== "undefined" ){
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exports.loadCSS = loadCSS;
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}
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else {
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w.loadCSS = loadCSS;
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}
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}( typeof global !== "undefined" ? global : this )); |