sajari-website/src/js/utils/loaded.js

Website extensions for the Sajari API. Automatically index site content, add user profiles, render search and recommendations, etc.

/*
 * loaded.js - Determines when the content has loaded with cross browser support
 */

var loaded = function(win, fn) {
	var done = false;
	var top = true;

	var doc = win.document;
	var root = doc.documentElement;
	var modern = doc.addEventListener;

	var add = modern ? 'addEventListener' : 'attachEvent';
	var rem = modern ? 'removeEventListener' : 'detachEvent';
	var pre = modern ? '' : 'on';

	var init = function(e) {
		if (e.type == 'readystatechange' && doc.readyState != 'complete') return;
		(e.type == 'load' ? win : doc)[rem](pre + e.type, init, false);
		if (!done && (done = true)) fn.call(win, e.type || e);
	};

	var poll = function() {
		try { root.doScroll('left'); } catch(e) { setTimeout(poll, 50); return; }
		init('poll');
	};

	if (doc.readyState == 'complete') fn.call(win, 'lazy');
	else {
		if (!modern && root.doScroll) {
			try { top = !win.frameElement; } catch(e) { }
			if (top) poll();
		}
		doc[add](pre + 'DOMContentLoaded', init, false);
		doc[add](pre + 'readystatechange', init, false);
		win[add](pre + 'load', init, false);
	}
};

module.exports = loaded;