DS7/DSWeb/js/jquery/lib/jquery.xLazyLoader.js

;(function($){
	$.xLazyLoader =  function ( method, options ) {
		if (typeof method == 'object') {
			options = method;
			method = 'load';
		};		
		xLazyLoader[method]( options );
	};	
	var xLazyLoader = new function ()
	{		
		var head = document.getElementsByTagName("head")[0];		
		this.load = function ( options )
		{
			//Defaults
			var d = {
				js: [],
				css: [],
				image: [],
				name: null,
				load: function(){}
			};
			$.extend(d, options);			
			var self = this,
				ready = false,
				loaded = {
					js: [],
					css: [],
					image: []
				};
			each('js', d.js);
			each('css', d.css);
			each('image', d.image);			
			function each (type, urls)
			{
				if ( $.isArray(urls) && urls.length>0 )
					$.each( urls, function(i, url){
						load(type, url);
					});
				else if (typeof urls == 'string')
					load(type, urls);
			};
			function load (type, url)
			{
 				self[type](url, function() { 
					$.isArray(d[type]) ? loaded[type].push(url) : loaded[type] = url;
					d.js.length == loaded.js.length 
					&& d.css.length == loaded.css.length 
					&& d.image.length == loaded.image.length
					&& d.load.apply(loaded, []);
                    return;
				}, d.name ?'lazy-loaded-'+ d.name : 'lazy-loaded-'+new Date().getTime());
			};			
		};		
		this.js = function (src, callback, name)
		{
			if ($('script[src*="'+src+'"]').length>0) {
				callback();
				return;
			};

      var script = document.createElement('script');
      script.setAttribute("type","text/javascript");
      script.setAttribute("src", src);
      script.setAttribute('id', name);
			if ($.browser.msie)
				script.onreadystatechange = function ()	{
					 /loaded|complete/.test(script.readyState) && callback();
				}
			else
				//FF, Safari, Opera
				script.onload = callback;
        head.appendChild(script);
		};
		
		this.css = function (href, callback, name)
		{

			if ($('link[href*="'+href+'"]').length>0) {
				callback();
				return;
			};
			var link = $('<link rel="stylesheet" type="text/css" media="all" href="'+href+'" id="'+name+'"></link>')[0];
			if ($.browser.msie)
				link.onreadystatechange = function ()	{
                    /loaded|complete/.test(link.readyState) && callback();
				}
			else if ($.browser.opera)
				link.onload = callback;
			else
				//FF, Safari, Chrome
				(function(){
					try {
						link.sheet.cssRule;
					} catch(e){
						setTimeout(arguments.callee, 20);
						return;
					};
					callback();
				})();
			head.appendChild(link);
		};
		
		this.image = function (src, callback)
		{
			var img = new Image();
			img.onload = callback;
			img.src = src;
		};
	
		this.disable = function ( name )
		{	
			$('#lazy-loaded-'+name, head).attr('disabled', 'disabled');
		};
		this.enable = function ( name )
		{	
			$('#lazy-loaded-'+name, head).removeAttr('disabled');
		};		
		
		this.destroy = function ( name )
		{
			$('#lazy-loaded-'+name, head).remove();	
		};

	};
})(jQuery);