fg-loadcss/src/onloadCSS.js

A function for loading CSS asynchronously

/*! onloadCSS. (onload callback for loadCSS) [c]2017 Filament Group, Inc. MIT License */
/* global navigator */
/* exported onloadCSS */
function onloadCSS( ss, callback ) {
	var called;
	function newcb(){
			if( !called && callback ){
				called = true;
				callback.call( ss );
			}
	}
	if( ss.addEventListener ){
		ss.addEventListener( "load", newcb );
	}
	if( ss.attachEvent ){
		ss.attachEvent( "onload", newcb );
	}

	// This code is for browsers that don’t support onload
	// No support for onload (it'll bind but never fire):
	//	* Android 4.3 (Samsung Galaxy S4, Browserstack)
	//	* Android 4.2 Browser (Samsung Galaxy SIII Mini GT-I8200L)
	//	* Android 2.3 (Pantech Burst P9070)

	// Weak inference targets Android < 4.4
 	if( "isApplicationInstalled" in navigator && "onloadcssdefined" in ss ) {
		ss.onloadcssdefined( newcb );
	}
}