Handlebars helpers for adding references to scripts / stylesheets

handlebars-script-stylesheet-refs.js

// Usage: {{scriptRef "your_script.js"}}

Handlebars.registerHelper('scriptRef', function(url) {
	var scripts = document.head.getElementsByTagName('script');
	for (var i = 0; i < scripts.length; i++) {
		if (scripts[i].src && scripts[i].src.indexOf(url) !== -1) {
			return;
		}
	}
	var script = document.createElement('script');
	script.src = url;
	document.head.appendChild(script);
});

Handlebars.registerHelper('stylesheetRef', function(url) {
	var links = document.head.getElementsByTagName('link');
	for (var i = 0; i < links.length; i++) {
		if (links[i].href && links[i].href.indexOf(url) !== -1) {
			return;
		}
	}
	var link = document.createElement('link');
	link.rel = 'stylesheet';
	link.href = url;
	document.head.appendChild(link);
});